Detection protection device of power line, electric connection equipment and electric equipment

Abstract

The invention discloses a detection and protection device of a power line, electric connection equipment and electric equipment. The detection and protection device comprises a switch module, an electric leakage detection module, an open circuit detection module and a trigger module, the electric leakage detection module comprises a first shielding conductor structure and a second shielding conductor structure; the first shielding conductor structure comprises a first end close to the input end of the power line, a second end close to the output end of the power line and a third end located between the first end and the second end; the second shielding conductor structure comprises a fourth end close to the input end, a fifth end close to the output end and a sixth end located between the fourth end and the fifth end; and the third end is connected with the sixth end. The feasibility and flexibility of the power line on electric leakage detection and shielding structure open circuit detection can be enriched, and the power supply safety of the power line can be improved.

Description

Technical Field

[0001] The present invention relates to the field of electrical technologies, and in particular, to a detection and protection device for a power cord, an electrical connection device, and an electrical equipment. Background Art

[0002] A Leakage Circuit Detector Interrupter (LCDI) is a power connection device for electrical appliances. It can detect the leakage current of a power cord group through a leakage current detection line and cut off the power connection of the electrical appliance when a certain leakage current is detected, ensuring safe use. In recent years, in addition to detecting the leakage current of the power cord through the leakage current detection line, the leakage current detection circuit breaker has also put forward higher safety detection requirements, such as detecting whether there is an open circuit in the leakage current detection line.

[0003] Currently, in the detection and protection device for a power cord, when performing leakage detection and open circuit detection of the leakage current detection line, generally, multiple leakage current detection lines are connected in series, a return line is connected in series with the leakage current detection line, or multiple leakage current detection lines are connected in parallel for the leakage current detection line of the power cord. The method of constructing the detection path is relatively limited, and the flexibility and safety of detection are insufficient. Summary of the Invention

[0004] An object of the present invention is to at least solve one of the technical problems existing in the prior art, and provide a detection and protection device for a power cord, an electrical connection device, and an electrical equipment, which can enrich the feasibility and flexibility of leakage detection and open circuit detection of the shielding structure of the power cord, and is beneficial to improving the power supply safety of the power cord.

[0005] In a first aspect, an embodiment of the present invention provides a detection and protection device for a power cord, where the power cord includes a first current-carrying line and a second current-carrying line, and the detection and protection device includes:

[0006] A switch module for controlling the electrical connection between the input end and the output end of the power cord;

[0007] The leakage detection module includes a first shielding conductor structure covering the first current-carrying line and a second shielding conductor structure covering the second current-carrying line; the first shielding conductor structure is used to collect the leakage signal of the first current-carrying line, and the second shielding conductor structure is used to collect the leakage signal of the second current-carrying line; the first shielding conductor structure includes a first end near the input end of the power line, a second end near the output end of the power line, and a third end between the first end and the second end; the second shielding conductor structure includes a fourth end near the input end, a fifth end near the output end, and a sixth end between the fourth end and the fifth end; the third end and the sixth end are connected.

[0008] The open-circuit detection module is respectively connected to the first end, the second end, the fourth end, and the fifth end, and the open-circuit detection module is configured to generate an open-circuit signal when at least a part of the first shielding conductor structure and / or the second shielding conductor structure is open-circuited.

[0009] The trigger module is coupled to the leakage detection module, the open-circuit detection module, and the switch module, and is configured to receive the leakage signal and / or the open-circuit signal, and drive the switch module to disconnect the power connection in response to the leakage signal and / or the open-circuit signal.

[0010] The detection and protection device for a power cord provided by an embodiment of the present invention has at least the following beneficial effects: The first shielding conductor structure in the leakage detection module wraps the first current-carrying line so as to collect the leakage signal of the first current-carrying line, and the second shielding conductor structure in the leakage detection module wraps the second current-carrying line so as to collect the leakage signal of the second current-carrying line. On this basis, by connecting the third end in the middle of the first shielding conductor structure to the sixth end in the second shielding conductor structure, an associated point exists in the shielding conductor structures of the first current-carrying line and the second current-carrying line, and the two shielding conductor structures are no longer independently separated. The open-circuit detection module is respectively connected to the first end and the second end of the first shielding conductor structure, and the fourth end and the fifth end of the second shielding conductor structure, so that the open-circuit detection module can perform open-circuit detection on a variety of different detection paths. For example, the detection path from the first end of the first shielding conductor structure to the third end, then to the sixth end of the second shielding conductor structure, and finally to the fourth end of the second shielding conductor structure; the detection path from the first end of the first shielding conductor structure to the third end, then to the sixth end of the second shielding conductor structure, and finally to the fifth end of the second shielding conductor structure; the detection path from the second end of the first shielding conductor structure to the third end, then to the sixth end of the second shielding conductor structure, and finally to the fourth end of the second shielding conductor structure; the detection path from the second end of the first shielding conductor structure to the third end, then to the sixth end of the second shielding conductor structure, and finally to the fifth end of the second shielding conductor structure. In addition, the trigger module is respectively coupled to the leakage detection module, the open-circuit detection module, and the switch module, and can drive the switch module to disconnect the power connection in the case of leakage of the first current-carrying line or the second current-carrying line, or in the case of an open circuit in at least a part of the first shielding conductor structure and / or the second shielding conductor structure, to ensure the power supply safety of the power cord. In the detection and protection device for the power cord of this embodiment, the first shielding conductor structure and the second shielding conductor structure form a shielding network with multiple detection segments that can be combined, so as to be able to construct a variety of different detection paths, greatly enriching the feasibility and flexibility of the leakage detection and open-circuit detection of the shielding structure of the power cord, and being beneficial to improving the power supply safety of the power cord.

[0011] According to the detection and protection device provided by some embodiments of the present invention, the trigger module includes a voltage stabilizing unit and a third switch unit that drives the switch module to disconnect the power connection when conducting. The control pin of the third switch unit is connected to the open-circuit detection module to obtain the open-circuit signal; the negative electrode of the voltage stabilizing unit is connected to the first shielding conductor structure and / or the second shielding conductor structure to obtain the leakage signal in the first shielding conductor structure and / or the second shielding conductor structure, and the positive electrode is connected to the control pin of the third switch unit.

[0012] According to the detection and protection device provided by some embodiments of the present invention, the negative electrode of the voltage stabilizing unit is connected to any one of the following:

[0013] the first end;

[0014] the second end;

[0015] the third end;

[0016] the fourth end;

[0017] the fifth end;

[0018] the sixth end.

[0019] The detection and protection device provided according to some embodiments of the present invention, wherein the open - circuit detection module includes a first switch unit and a second switch unit;

[0020] One end of the first switch unit is connected to the first current - carrying line or the second current - carrying line, and the other end is connected to the trigger module. The open - circuit detection module further includes a first biasing unit for providing a switch - conducting signal to the first switch unit. One end of the first biasing unit is connected to the first end, and the other end is connected to the fourth end;

[0021] One end of the second switch unit is connected to the first current - carrying line or the second current - carrying line, and the other end is connected to the trigger module. The open - circuit detection module further includes a second biasing unit for providing a switch - conducting signal to the second switch unit. One end of the second biasing unit is connected to the second end, and the other end is connected to the fifth end.

[0022] According to the detection and protection device provided by some embodiments of the present invention, the first biasing unit is configured to: when any part of the first shielding conductor structure and the second shielding conductor structure between the first end and the fourth end is open - circuited, provide a switch - conducting signal to the first switch unit to turn on the first switch unit, so that the first switch unit sends an open - circuit signal to the trigger module; the second biasing unit is configured to: when any part of the first shielding conductor structure and the second shielding conductor structure between the second end and the fifth end is open - circuited, provide a switch - conducting signal to the second switch unit to turn on the second switch unit, so that the second switch unit sends an open - circuit signal to the trigger module.

[0023] The detection and protection device provided according to some embodiments of the present invention, the first switch unit includes a first triode, the first biasing unit includes a first resistor, the open-circuit detection module further includes a second resistor and a third resistor, one end of the first resistor is connected to the first end, the emitter of the first triode, and one end of the second resistor, the other end of the second resistor is connected to one of the first current-carrying line and the second current-carrying line, the other end of the first resistor is connected to the fourth end, the base of the first triode, and one end of the third resistor, the other end of the third resistor is connected to the other of the first current-carrying line and the second current-carrying line, and the collector of the first triode is connected to the trigger module.

[0024] The detection and protection device provided according to some embodiments of the present invention, the second switch unit includes a second triode, the second biasing unit includes a fourth resistor, the open-circuit detection module further includes a fifth resistor and a sixth resistor, one end of the fourth resistor is connected to the second end, the emitter of the second triode, and one end of the fifth resistor, the other end of the fifth resistor is connected to one of the first current-carrying line and the second current-carrying line, the other end of the fourth resistor is connected to the fifth end, the base of the second triode, and one end of the sixth resistor, the other end of the sixth resistor is connected to the other of the first current-carrying line and the second current-carrying line, and the collector of the second triode is connected to the trigger module.

[0025] The detection and protection device provided according to some embodiments of the present invention, the open-circuit detection module includes a first switch unit and a second switch unit;

[0026] One end of the first switch unit is connected to the first current-carrying line or the second current-carrying line, and the other end is connected to the trigger module. The open-circuit detection module further includes a first biasing unit for providing a switch conduction signal to the first switch unit. One end of the first biasing unit is connected to the first end, and the other end is connected to the fifth end;

[0027] One end of the second switch unit is connected to the first current-carrying line or the second current-carrying line, and the other end is connected to the trigger module. The open-circuit detection module further includes a second biasing unit for providing a conduction signal to the second switch unit. One end of the second biasing unit is connected to the second end, and the other end is connected to the fourth end.

[0028] The detection and protection device provided according to some embodiments of the present invention, the trigger module further includes a tripping coil for generating an electromagnetic force to drive the switch module to disconnect the power connection. The tripping coil is connected in series with the third switch unit between the first current-carrying line and the second current-carrying line.

[0029] According to the detection and protection device provided by some embodiments of the present invention, the third switch unit includes a thyristor, the trigger module further includes a seventh resistor, the control electrode of the thyristor is respectively connected to one end of the seventh resistor, the positive electrode of the voltage stabilizing unit, and the open circuit detection module, the other end of the seventh resistor and the cathode of the thyristor are connected to the first current-carrying line, and the anode of the thyristor is connected to the second current-carrying line through the tripping coil.

[0030] According to the detection and protection device provided by some embodiments of the present invention, the trigger module further includes a first capacitor connected in parallel with the seventh resistor.

[0031] According to the detection and protection device provided by some embodiments of the present invention, the trigger module further includes a first diode and a second diode, the other end of the seventh resistor and the cathode of the thyristor are connected to the anodes of the first diode and the second diode, the cathode of the first diode is connected to the first current-carrying line, and the cathode of the second diode is connected to the connection point between the thyristor and the tripping coil.

[0032] According to the detection and protection device provided by some embodiments of the present invention, it further includes a leakage simulation module, the leakage simulation module includes a first test switch, one end of the first test switch is connected to the first current-carrying line or the second current-carrying line, and the other end is connected to the first shielding conductor structure and / or the second shielding conductor structure.

[0033] According to the detection and protection device provided by some embodiments of the present invention, the leakage simulation module further includes an eighth resistor and a ninth resistor, the other end of the first test switch is respectively connected to one end of the eighth resistor and one end of the ninth resistor, and the other ends of the eighth resistor and the ninth resistor are respectively connected to two of the first end, the second end, the third end, the fourth end, the fifth end, and the sixth end.

[0034] According to the detection and protection device provided by some embodiments of the present invention, it further includes a second test switch, one end of the second test switch is connected to the first current-carrying line or the second current-carrying line, and the other end is connected to the control pin of the third switch unit.

[0035] The detection and protection device provided according to some embodiments of the present invention further includes a leakage simulation module. The leakage simulation module includes a third test switch and a fourteenth resistor. One end of the third test switch is connected to the first current-carrying line or the second current-carrying line, and the other end is connected to the first shielding conductor structure and / or the second shielding conductor structure through the fourteenth resistor. The fourteenth resistor is configured to: when the third test switch is pressed and the open-circuit detection module fails, adjust the potential of the negative electrode of the voltage stabilizing unit so that the voltage stabilizing unit is not broken down.

[0036] For the detection and protection device provided according to some embodiments of the present invention, the trigger module further includes a tenth resistor and an eleventh resistor. The negative electrode of the voltage stabilizing unit is connected to the first shielding conductor structure and / or the second shielding conductor structure through the eleventh resistor, and the open-circuit detection module is connected to the negative electrode of the voltage stabilizing unit through the tenth resistor, so that the third switch unit obtains the open-circuit signal through the tenth resistor.

[0037] For the detection and protection device provided according to some embodiments of the present invention, the first switch unit includes a first triode, and the first biasing unit includes a first resistor and a twelfth resistor; the second switch unit includes a second triode, and the second biasing unit includes a fourth resistor and a thirteenth resistor; the open-circuit detection module further includes a second resistor, a third resistor, a fifth resistor, and a sixth resistor; the emitter of the first triode is connected to one end of the first resistor, the first end, and one end of the second resistor, the base of the first triode is connected to the other end of the first resistor and one end of the twelfth resistor, and the other end of the twelfth resistor is connected to the fourth end and one end of the third resistor; the emitter of the second triode is connected to one end of the fourth resistor, the second end, and one end of the fifth resistor, the base of the second triode is connected to the other end of the fourth resistor and one end of the thirteenth resistor, and the other end of the thirteenth resistor is connected to the fifth end and one end of the sixth resistor; the other end of the second resistor and the other end of the fifth resistor are connected together and connected to one of the first current-carrying line and the second current-carrying line, the other end of the third resistor and the other end of the sixth resistor are connected together and connected to the other of the first current-carrying line and the second current-carrying line, and the collector of the first triode and the collector of the second triode are connected together and connected to the trigger module.

[0038] The detection and protection device provided according to some embodiments of the present invention, the triggering module includes a voltage stabilizing unit and a third switching unit that drives the switching module to disconnect the power connection when conducting, and a control pin of the third switching unit is connected to a collector of the first triode and a collector of the second triode to obtain the open circuit signal; a negative electrode of the voltage stabilizing unit is connected to the first shielding conductor structure and / or the second shielding conductor structure to obtain a leakage signal in the first shielding conductor structure and / or the second shielding conductor structure, and a positive electrode of the voltage stabilizing unit is connected to the control pin of the third switching unit.

[0039] The detection and protection device provided according to some embodiments of the present invention further includes a leakage simulation module, the leakage simulation module includes a third test switch, one end of the third test switch is connected to a connection point of the second resistor and the fifth resistor, and the other end of the third test switch is connected to the first shielding conductor structure and / or the second shielding conductor structure.

[0040] The leakage simulation module of the detection and protection device provided according to some embodiments of the present invention further includes a fourteenth resistor, the other end of the third test switch is connected to one end of the fourteenth resistor, and the other end of the fourteenth resistor is connected to the third terminal; the negative electrode of the voltage stabilizing unit is connected to the sixth terminal; the fourteenth resistor is configured to: when the third test switch is pressed and the open circuit detection module fails, adjust the potential of the negative electrode of the voltage stabilizing unit so that the voltage stabilizing unit is not broken down.

[0041] The detection and protection device provided according to some embodiments of the present invention further includes a leakage simulation module;

[0042] The open circuit detection module includes a first triode, a first voltage dividing unit, a second triode and a second voltage dividing unit; the first voltage dividing unit includes a second resistor, a first resistor, a twelfth resistor and a third resistor connected in series in sequence, and the second voltage dividing unit includes a fifth resistor, a fourth resistor, a thirteenth resistor and a sixth resistor connected in series in sequence; a connection point of the second resistor and the first resistor is connected to the first terminal and an emitter of the first triode; a connection point of the first resistor and the twelfth resistor is connected to a base of the first triode; a connection point of the twelfth resistor and the third resistor is connected to the fourth terminal; a connection point of the fifth resistor and the fourth resistor is connected to the second terminal and an emitter of the second triode; a connection point of the fourth resistor and the thirteenth resistor is connected to a base of the second triode; a connection point of the thirteenth resistor and the sixth resistor is connected to the fifth terminal; the second resistor and the fifth resistor are connected together and connected to the second current-carrying line, and the third resistor and the sixth resistor are connected together and connected to the first current-carrying line;

[0043] The triggering module includes a voltage stabilizing unit and a third switching unit that drives the switching module to disconnect the power connection when conducting; a control pin of the third switching unit is connected to the collector of the first triode and the collector of the second triode to obtain the open - circuit signal; the positive electrode of the voltage stabilizing unit is connected to the control pin of the third switching unit, and the negative electrode is connected to the sixth terminal to obtain the leakage signal;

[0044] The leakage simulation module includes a third test switch and a fourteenth resistor; one end of the third test switch is connected to the connection point of the second resistor and the fifth resistor, the other end of the third test switch is connected to one end of the fourteenth resistor, and the other end of the fourteenth resistor is connected to the third terminal.

[0045] In a second aspect, an embodiment of the present invention provides an electrical connection device, including the detection and protection device, a housing, and the power cord as described in the first - aspect embodiment above. The power cord is connected to the housing, and the switching module, the open - circuit detection module, and the triggering module are arranged in the housing.

[0046] In a third aspect, an embodiment of the present invention provides an electrical equipment, including a load device and the electrical connection device as described in the second - aspect embodiment above. The output end of the power cord is connected to the load device.

[0047] Other features and advantages of the present invention will be described in the subsequent description, and part of them will be obvious from the description, or will be understood by implementing the present invention. The objectives and other advantages of the present invention can be achieved and obtained through the structures specifically pointed out in the description, the claims, and the drawings. Description of the Drawings

[0048] The drawings are used to provide a further understanding of the technical solution of the present invention, and constitute a part of the description. Together with the embodiments of the present invention, they are used to explain the technical solution of the present invention, and do not constitute a limitation to the technical solution of the present invention.

[0049] The present invention will be further described below in conjunction with the drawings and embodiments;

[0050] Figure 1 It is a block diagram of the module principle of the detection and protection device provided by the embodiment of the present invention;

[0051] Figure 2 It is a circuit schematic diagram of the detection and protection device provided by Embodiment 1 of the present invention;

[0052] Figure 3 It is a circuit schematic diagram of the detection and protection device provided by Embodiment 2 of the present invention;

[0053] Figure 4It is the circuit schematic diagram of the detection and protection device provided in the third embodiment of the present invention;

[0054] Figure 5 It is the circuit schematic diagram of the detection and protection device provided in the fourth embodiment of the present invention;

[0055] Figure 6 It is the circuit schematic diagram of the detection and protection device provided in the fifth embodiment of the present invention;

[0056] Figure 7 It is the schematic diagram of the conduction path on the first shielding conductor structure and the second shielding conductor structure when a part of the first shielding conductor structure between the first end and the third end is open in the detection and protection device provided in the first embodiment of the present invention;

[0057] Figure 8 It is the schematic diagram of the conduction path on the first shielding conductor structure and the second shielding conductor structure when a part of the first shielding conductor structure between the second end and the third end is open in the detection and protection device provided in the first embodiment of the present invention;

[0058] Figure 9 It is the schematic diagram of the conduction path on the first shielding conductor structure and the second shielding conductor structure when the connecting conductor between the third end and the sixth end is open in the detection and protection device provided in the first embodiment of the present invention;

[0059] Figure 10 It is the schematic diagram of the conduction path on the first shielding conductor structure and the second shielding conductor structure when a part of the second shielding conductor structure between the fourth end and the sixth end is open in the detection and protection device provided in the first embodiment of the present invention;

[0060] Figure 11 It is the schematic diagram of the conduction path on the first shielding conductor structure and the second shielding conductor structure when a part of the second shielding conductor structure between the fifth end and the sixth end is open in the detection and protection device provided in the first embodiment of the present invention;

[0061] Figure 12 It is the circuit schematic diagram of the detection and protection device provided in the sixth embodiment of the present invention;

[0062] Figure 13 It is the circuit schematic diagram of the detection and protection device provided in the seventh embodiment of the present invention;

[0063] Figure 14 It is the circuit schematic diagram of the detection and protection device provided in the eighth embodiment of the present invention;

[0064] Figure 15 It is the structural schematic diagram of the electrical connection device provided in the embodiment of the present invention. Detailed implementation manners

[0065] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The role of the accompanying drawings is to supplement the description in the text part of the specification, enabling people to intuitively and vividly understand each technical feature and the overall technical solution of the present invention. However, it should not be construed as a limitation on the protection scope of the present invention.

[0066] In the description of the embodiments of the present invention, the meaning of "several" is one or more, the meaning of "multiple" is two or more, "greater than", "less than", "exceeding", etc. are understood as not including the number itself, "above", "below", "within", etc. are understood as including the number itself, "at least one" means one or more, and "at least one of the following" and its similar expressions refer to any combination of these items, including any combination of single or plural items. If there is a description of "first", "second", etc., it is only for the purpose of distinguishing technical features and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0067] It should be noted that words such as "set", "installed", "connected", etc. in the embodiments of the present invention should be understood in a broad sense. Those skilled in the art can reasonably determine the specific meaning of the above words in the embodiments of the present invention in combination with the specific content of the technical solution. For example, the term "connected" can be a mechanical connection, an electrical connection, or a connection that can communicate with each other; it can be directly connected or indirectly connected through an intermediate medium.

[0068] It should be noted that the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0069] A leakage circuit detector interrupter (LCDI) is a power connection device for electrical appliances. It can detect the leakage current of the power line group through a leakage current detection line and cut off the power connection of the electrical appliance when a certain leakage current is detected to ensure safe use. In recent years, in addition to detecting the leakage current of the power line through the leakage current detection line, the leakage circuit detector interrupter has also put forward higher safety detection requirements, such as detecting whether there is an open circuit in the leakage current detection line. Currently, in the detection and protection device of the power line, when performing leakage detection and open circuit detection of the leakage current detection line, generally, multiple leakage current detection lines are connected in series, a return line is connected in series with the leakage current detection line, or multiple leakage current detection lines are connected in parallel to process the connection of the power line's leakage current detection line. The way of constructing the detection path is relatively limited, and the flexibility and safety of detection are insufficient.

[0070] Based on this, the embodiments of the present invention provide a detection and protection device for a power cord, an electrical connection device, and an electrical equipment, which can enrich the feasibility and flexibility of the power cord for leakage detection and open - circuit detection of the shielding structure, and is beneficial to improving the power supply safety of the power cord.

[0071] The following further elaborates on the embodiments of the present invention in conjunction with the accompanying drawings.

[0072] Figure 1 It is the block - diagram of the module principle of the detection and protection device provided by the embodiments of the present invention; Figure 2 It is the circuit schematic diagram of the detection and protection device provided by the embodiments of the present invention. Referring to Figure 1 and Figure 2 The first - aspect embodiment of the present invention provides a detection and protection device for a power cord, wherein: the power cord includes a first current - carrying line 110 and a second current - carrying line 120.

[0073] It can be understood that when the power cord supplies power to an electrical equipment using two - phase alternating current, it can be one of the following two situations: the first current - carrying line 110 is the live wire L, and the second current - carrying line 120 is the neutral wire N; the first current - carrying line 110 is the neutral wire N, and the second current - carrying line 120 is the live wire L. When the power cord supplies power to an electrical equipment using three - phase alternating current, it can be one of the following three situations: the first current - carrying line 110 is the live wire L1, and the second current - carrying line 120 is the neutral wire N; the first current - carrying line 110 is the neutral wire N, and the second current - carrying line 120 is the live wire L1; the first current - carrying line 110 is the live wire L1, and the second current - carrying line 120 is the live wire L2. Hereinafter, the situation where the first current - carrying line 110 is the live wire L and the second current - carrying line 120 is the neutral wire N is taken as an example for illustration, and the same applies to the other situations.

[0074] The detection and protection device includes a switch module 210, a leakage detection module 220, an open - circuit detection module 230, and a trigger module 240, wherein:

[0075] The switch module 210 is used to control the electrical connection between the input end and the output end of the power cord; referring to Figure 2 As shown, the switch module 210 is provided with switch terminals on the first current - carrying line 110 and the second current - carrying line 120. When the switch terminals of the switch module 210 are closed, the electrical connection between the input end and the output end of the power cord is conducted; when the switch terminals of the switch module 210 are opened, the electrical connection between the input end and the output end of the power cord is disconnected.

[0076] The leakage detection module 220 includes a first shielding conductor structure 221 that wraps the first current-carrying line 110 and a second shielding conductor structure 222 that wraps the second current-carrying line 120; the first shielding conductor structure 221 is used to collect the leakage signal of the first current-carrying line 110, and the second shielding conductor structure 222 is used to collect the leakage signal of the second current-carrying line 120; the first shielding conductor structure 221 includes a first end a near the input end of the power supply line, a second end b near the output end of the power supply line, and a third end c between the first end a and the second end b; the second shielding conductor structure 222 includes a fourth end d near the input end, a fifth end e near the output end, and a sixth end f between the fourth end d and the fifth end e; the third end c and the sixth end f are connected. It can be understood that the first shielding conductor structure 221 in the leakage detection module 220 wraps the first current-carrying line 110 so as to collect the leakage signal of the first current-carrying line 110, and the second shielding conductor structure 222 in the leakage detection module 220 wraps the second current-carrying line 120 so as to collect the leakage signal of the second current-carrying line 120. On this basis, by connecting the third end c in the middle of the first shielding conductor structure 221 to the sixth end f in the second shielding conductor structure 222, there is an associated point between the shielding conductor structures of the first current-carrying line 110 and the second current-carrying line 120, and the two shielding conductor structures are no longer independently separated.

[0077] The open-circuit detection module 230 is respectively connected to the first end a, the second end b, the fourth end d, and the fifth end e. The open-circuit detection module 230 is configured to generate an open-circuit signal when at least a part of the first shielding conductor structure 221 and / or the second shielding conductor structure 222 is open; it can be understood that the open-circuit detection module 230 is respectively connected to the first end a and the second end b of the first shielding conductor structure 221, and the fourth end d and the fifth end e of the second shielding conductor structure 222, so that the open-circuit detection module 230 can perform open-circuit detection on multiple different detection paths at the same time. For example, the detection path from the first end a of the first shielding conductor structure 221 to the third end c, then to the sixth end f of the second shielding conductor structure 222, and finally to the fourth end d of the second shielding conductor structure 222; the detection path from the first end a of the first shielding conductor structure 221 to the third end c, then to the sixth end f of the second shielding conductor structure 222, and finally to the fifth end e of the second shielding conductor structure 222; the detection path from the second end b of the first shielding conductor structure 221 to the third end c, then to the sixth end f of the second shielding conductor structure 222, and finally to the fourth end d of the second shielding conductor structure 222; the detection path from the second end b of the first shielding conductor structure 221 to the third end c, then to the sixth end f of the second shielding conductor structure 222, and finally to the fifth end e of the second shielding conductor structure 222.

[0078] The trigger module 240 is coupled to the leakage detection module 220, the open - circuit detection module 230, and the switch module 210, and is configured to receive a leakage signal and / or an open - circuit signal, and drive the switch module 210 to disconnect the power connection in response to the leakage signal and / or the open - circuit signal.

[0079] According to the detection and protection device for a power line provided by an embodiment of the present invention, the trigger module 240 is respectively coupled to the leakage detection module 220, the open - circuit detection module 230, and the switch module 210, and can drive the switch module 210 to disconnect the power connection when a leakage occurs in the first current - carrying line 110 or the second current - carrying line 120, or when at least a part of the first shielding conductor structure 221 and / or the second shielding conductor structure 222 is open - circuited, thus ensuring the power supply safety of the power line; in the detection and protection device for the power line of this embodiment, the first shielding conductor structure 221 and the second shielding conductor structure 222 form a shielding network with multiple detection segments that can be combined, so that a variety of different detection paths can be constructed, greatly enriching the feasibility and flexibility of the leakage detection and open - circuit detection of the shielding structure of the power line, which is beneficial to improving the power supply safety of the power line.

[0080] Refer to Figure 2 In the detection and protection device provided by some embodiments of the present invention, the trigger module 240 includes a voltage - stabilizing unit ZD1 and a third switch unit 241 that drives the power connection between the input terminal and the output terminal of the switch module 210 to be disconnected when conducting. The control pin of the third switch unit 241 is connected to the open - circuit detection module 230 to obtain an open - circuit signal; the negative electrode of the voltage - stabilizing unit ZD1 is connected to the first shielding conductor structure 221 and / or the second shielding conductor structure 222 to obtain a leakage signal in the first shielding conductor structure 221 and / or the second shielding conductor structure 222, and the positive electrode of the voltage - stabilizing unit ZD1 is connected to the control pin of the third switch unit 241.

[0081] It can be understood that since the first shielding conductor structure 221 and the second shielding conductor structure 222 have been connected together through the third end c of the first shielding conductor structure 221 and the sixth end f of the second shielding conductor structure 222, therefore, when there is no short - circuit in the first shielding conductor structure 221, the second shielding conductor structure 222, and the connecting conductor between the third end c and the sixth end f, the negative electrode of the voltage - stabilizing unit ZD1 only needs to be connected to any point in the first shielding conductor structure 221 and the second shielding conductor structure 222, and the leakage signals detected at any other position of the first shielding conductor structure 221 and the second shielding conductor structure 222 can be transmitted to the negative electrode of the voltage - stabilizing unit ZD1.

[0082] In the detection and protection device provided by some embodiments of the present invention, the negative electrode of the voltage stabilizing unit ZD1 is connected to any one of the following: the first terminal a; the second terminal b; the third terminal c; the fourth terminal d; the fifth terminal e; the sixth terminal f.

[0083] It can be understood that the first terminal a, the second terminal b, and the third terminal c are the connection points led out from the first shielding conductor structure 221, and the fourth terminal d, the fifth terminal e, and the sixth terminal f are the connection points led out from the second shielding conductor structure 222. Therefore, connecting the negative electrode of the voltage stabilizing unit ZD1 to any one of the above six terminals has the advantage of convenient wiring.

[0084] It should be noted that the control pin of the third switch unit 241 can be directly connected to the open-circuit detection module 230 to obtain an open-circuit signal, or indirectly connected to the open-circuit detection module 230. For example, referring to Figure 2 As shown, the trigger module 240 further includes a tenth resistor R10, and the control pin of the third switch unit 241 is indirectly connected to the open-circuit detection module 230 through the tenth resistor R10; similarly, the negative electrode of the voltage stabilizing unit ZD1 can be directly connected to the first shielding conductor structure 221 and / or the second shielding conductor structure 222, or indirectly connected to the first shielding conductor structure 221 and / or the second shielding conductor structure 222. For example, referring to Figure 2 As shown, the trigger module 240 further includes an eleventh resistor R11, and the negative electrode of the voltage stabilizing unit ZD1 is connected to the first shielding conductor structure 221 and / or the second shielding conductor structure 222 through the eleventh resistor R11.

[0085] Referring to Figure 2 , in the detection and protection device provided by some embodiments of the present invention, the negative electrode of the voltage stabilizing unit ZD1 is connected to any one of the first terminal a, the second terminal b, the third terminal c, the fourth terminal d, the fifth terminal e, and the sixth terminal f through the eleventh resistor R11.

[0086] Referring to Figure 2 , in the detection and protection device provided by some embodiments of the present invention, the open-circuit detection module 230 includes a first switch unit 231 and a second switch unit 232;

[0087] One end of the first switch unit 231 is connected to the first current-carrying line 110 or the second current-carrying line 120, and the other end is connected to the trigger module 240. The open-circuit detection module 230 further includes a first biasing unit for providing a switch conduction signal to the first switch unit 231. One end of the first biasing unit is connected to the first terminal a, and the other end is connected to the fourth terminal d;

[0088] One end of the second switch unit 232 is connected to the first current-carrying line 110 or the second current-carrying line 120, and the other end is connected to the trigger module 240. The open-circuit detection module 230 further includes a second bias unit for providing a switch-on signal to the second switch unit 232. One end of the second bias unit is connected to the second end b, and the other end is connected to the fifth end e.

[0089] In this embodiment, since the two ends of the first bias unit are respectively connected to the first end a and the fourth end d, and the first end a and the fourth end d are short-circuited by the part of the first shielding conductor structure 221 between the first end a and the third end c, the connecting conductor between the third end c and the sixth end f, and the part of the second shielding conductor structure 222 between the sixth end f and the fourth end d, that is, the two ends of the first bias unit are short-circuited, and the switch-on signal cannot be provided to the first switch unit 231; similarly, since the two ends of the second bias unit are respectively connected to the second end b and the fifth end e, and the second end b and the fifth end e are short-circuited by the part of the first shielding conductor structure 221 between the second end b and the third end c, the connecting conductor between the third end c and the sixth end f, and the part of the second shielding conductor structure 222 between the sixth end f and the fifth end e, that is, the two ends of the second bias unit are short-circuited, and the switch-on signal cannot be provided to the second switch unit 232.

[0090] Refer to Figure 2 , in the detection and protection device provided in some embodiments of the present invention, the first bias unit is configured to: when any part of the first shielding conductor structure 221 and the second shielding conductor structure 222 between the first end a and the fourth end d is open-circuited, provide a switch-on signal to the first switch unit 231 to turn on the first switch unit 231, so that the first switch unit 231 sends an open-circuit signal to the trigger module 240; the second bias unit is configured to: when any part of the first shielding conductor structure 221 and the second shielding conductor structure 222 between the second end b and the fifth end e is open-circuited, provide a switch-on signal to the second switch unit 232 to turn on the second switch unit 232, so that the second switch unit 232 sends an open-circuit signal to the trigger module 240.

[0091] It should be noted that, in this embodiment, when any part of the first shielding conductor structure 221 and the second shielding conductor structure 222 between the first end a and the fourth end d is open-circuited, that is, when the part of the first shielding conductor structure 221 between the first end a and the third end c is open-circuited, or when the part of the second shielding conductor structure 222 between the sixth end f and the fourth end d is open-circuited, the two ends of the first biasing unit will no longer be short-circuited, so that a switch-on signal can be provided to the first switch unit 231, making the first switch unit 231 conduct, and then an open-circuit signal is sent to the trigger module 240 under the action of the electric energy provided by the first current-carrying line 110 or the second current-carrying line 120; similarly, when any part of the first shielding conductor structure 221 and the second shielding conductor structure 222 between the second end b and the fifth end e is open-circuited, that is, when the part of the first shielding conductor structure 221 between the second end b and the third end c is open-circuited, or when the part of the second shielding conductor structure 222 between the sixth end f and the fifth end e is open-circuited, the two ends of the second biasing unit will no longer be short-circuited, so that a switch-on signal can be provided to the second switch unit 232, making the second switch unit 232 conduct, and then an open-circuit signal is sent to the trigger module 240 under the action of the electric energy provided by the first current-carrying line 110 or the second current-carrying line 120. It should also be noted that when the connecting conductor between the third end c and the sixth end f is disconnected, the short circuit between the first end a and the fourth end d and between the second end b and the fifth end e will be removed simultaneously, that is, the two ends of the first biasing unit and the two ends of the second biasing unit will no longer be short-circuited, so that switch-on signals can be provided to the first switch unit 231 and the second switch unit 232 simultaneously, and then the first switch unit 231 and the second switch unit 232 send open-circuit signals to the trigger module 240 simultaneously.

[0092] Referring to Figure 2 , in the detection and protection device provided in some embodiments of the present invention, the first switch unit 231 includes a first triode Q1, the first biasing unit includes a first resistor R1, and the open-circuit detection module 230 further includes a second resistor R2 and a third resistor R3. One end of the first resistor R1 is connected to the first end a, the emitter of the first triode Q1, and one end of the second resistor R2. The other end of the second resistor R2 is connected to the second current-carrying line 120. The other end of the first resistor R1 is connected to the fourth end d, the base of the first triode Q1, and one end of the third resistor R3. The other end of the third resistor R3 is connected to the first current-carrying line 110. The collector of the first triode Q1 is connected to the trigger module 240. It can be understood that the collector of the first triode Q1 can be directly connected to the control pin of the third switch unit 241 in the trigger module 240, or indirectly connected to the control pin of the third switch unit 241 in the trigger module 240. For example, referring to Figure 2As shown, the collector of the first triode Q1 is connected to the control pin of the third switch unit 241 in the trigger module 240 through the tenth resistor R10.

[0093] In this embodiment, both ends of the first resistor R1 are respectively connected to the first end a and the fourth end d, thus being short-circuited. The first resistor R1 does not undertake voltage division, making the emitter and base of the first triode Q1 equipotential points. The first resistor R1 does not provide a bias voltage to the emitter junction of the first triode Q1, and the first triode Q1 cannot conduct. When the part of the first shielding conductor structure 221 between the first end a and the third end c is open, or when the part of the second shielding conductor structure 222 between the sixth end f and the fourth end d is open, or when the connecting conductor between the third end c and the sixth end f is disconnected, the two ends of the first resistor R1 will no longer be short-circuited and can undertake voltage division, thereby being able to provide a bias voltage to the emitter junction of the first triode Q1 to make the first triode Q1 conduct.

[0094] It should be noted that Figure 2 The shown trigger module 240 further includes a tripping coil Lx and a first diode D1. Among them, one end of the second resistor R2 is connected to the second current-carrying line 120, not directly connected to the second current-carrying line 120, but connected to the second current-carrying line 120 via the tripping coil Lx. It can be understood that in some other embodiments, one end of the second resistor R2 connected to the second current-carrying line 120 can also be directly connected to the second current-carrying line 120 without being connected to the second current-carrying line 120 via the tripping coil Lx. Similarly, one end of the third resistor R3 connected to the first current-carrying line 110 is not directly connected to the first current-carrying line 110, but connected to the first current-carrying line 110 via the first diode D1. It can be understood that in some other embodiments, one end of the third resistor R3 connected to the first current-carrying line 110 can also be directly connected to the first current-carrying line 110 without being connected to the first current-carrying line 110 via the first diode D1.

[0095] Refer to Figure 2, in the detection and protection device provided by some embodiments of the present invention, the second switch unit 232 includes a second triode Q2, the second biasing unit includes a fourth resistor R4, and the open-circuit detection module 230 further includes a fifth resistor R5 and a sixth resistor R6. One end of the fourth resistor R4 is connected to the second terminal b, the emitter of the second triode Q2, and one end of the fifth resistor R5. The other end of the fifth resistor R5 is connected to the second current-carrying line 120. The other end of the fourth resistor R4 is connected to the fifth terminal e, the base of the second triode Q2, and one end of the sixth resistor R6. The other end of the sixth resistor R6 is connected to the first current-carrying line 110. The collector of the second triode Q2 is connected to the trigger module 240. It can be understood that the collector of the second triode Q2 can be directly connected to the control pin of the third switch unit 241 in the trigger module 240, or indirectly connected to the control pin of the third switch unit 241 in the trigger module 240. For example, as shown in Figure 2 , the collector of the second triode Q2 is connected to the control pin of the third switch unit 241 in the trigger module 240 through a tenth resistor R10.

[0096] In this embodiment, both ends of the fourth resistor R4 are respectively connected to the second terminal b and the fifth terminal e, so it is short-circuited. The fourth resistor R4 does not undertake voltage division, making the emitter and the base of the second triode Q2 equipotential points. The fourth resistor R4 does not provide a bias voltage to the emitter junction of the second triode Q2, and the second triode Q2 cannot conduct. When a part of the first shielding conductor structure 221 between the second terminal b and the third terminal c is open, or when a part of the second shielding conductor structure 222 between the sixth terminal f and the fifth terminal e is open, or when the connecting conductor between the third terminal c and the sixth terminal f is disconnected, both ends of the fourth resistor R4 will no longer be short-circuited, and it can undertake voltage division, so as to provide a bias voltage to the emitter junction of the second triode Q2 to make the second triode Q2 conduct.

[0097] It should be noted that Figure 2The trigger module 240 shown further includes a trip coil Lx and a first diode D1. Among them, the fifth resistor R5 is connected to one end of the second current-carrying line 120, not directly connected to the second current-carrying line 120, but connected to the second current-carrying line 120 via the trip coil Lx. It can be understood that in some other embodiments, one end of the fifth resistor R5 connected to the second current-carrying line 120 can also be directly connected to the second current-carrying line 120 without being connected to the second current-carrying line 120 via the trip coil Lx. Similarly, one end of the sixth resistor R6 connected to the first current-carrying line 110 is not directly connected to the first current-carrying line 110, but connected to the first current-carrying line 110 via the first diode D1. It can be understood that in some other embodiments, one end of the sixth resistor R6 connected to the first current-carrying line 110 can also be directly connected to the first current-carrying line 110 without being connected to the first current-carrying line 110 via the first diode D1.

[0098] In addition, it can also be understood that in Figure 2 the embodiment, one end of the second resistor R2 and one end of the fifth resistor R5 are connected together and then connected to the second current-carrying line 120 via the trip coil Lx, and one end of the third resistor R3 and one end of the sixth resistor R6 are connected to the first current-carrying line 110 via the first diode D1. In some other embodiments, one end of the second resistor R2 and one end of the fifth resistor R5 are connected together and then changed to be connected to the first current-carrying line 110 via the trip coil Lx, and one end of the third resistor R3 and one end of the sixth resistor R6 are changed to be connected to the second current-carrying line 120 via the first diode D1.

[0099] In another embodiment different from the embodiment shown in the present invention and Figure 2 the open-circuit detection module 230 includes a first switch unit 231 and a second switch unit 232; the trigger module 240 includes a trip coil Lx and a first diode D1;

[0100] One end of the first switch unit 231 is connected to the first current-carrying line 110 or the second current-carrying line 120, and the other end is connected to the trigger module 240. The open-circuit detection module 230 further includes a first biasing unit for providing a switch-on signal for the first switch unit 231. One end of the first biasing unit is connected to the first end a, and the other end is connected to the fifth end e; Specifically, referring to Figure 3, the first switch unit 231 includes a first triode Q1, the first bias unit includes a first resistor R1, the first switch unit 231 further includes a second resistor R2 and a third resistor R3. One end of the second resistor R2 is connected to the second current-carrying line 120 via a trip coil Lx, and the other end of the second resistor R2 is connected to one end of the first resistor R1, the emitter of the first triode Q1, and the first terminal a. The other end of the first resistor R1 is connected to one end of the third resistor R3, the base of the first triode Q1, and the fifth terminal e. The collector of the first triode Q1 is connected to the trigger module 240, and the other end of the third resistor R3 is connected to the first current-carrying line 110 via a first diode D1;

[0101] One end of the second switch unit 232 is connected to the first current-carrying line 110 or the second current-carrying line 120, and the other end is connected to the trigger module 240. The open-circuit detection module 230 further includes a second bias unit for providing a conduction signal to turn on the second switch unit 232. One end of the second bias unit is connected to the second terminal b, and the other end is connected to the fourth terminal d; Specifically, the second switch unit 232 includes a second triode Q2, the second bias unit includes a fourth resistor R4, the second switch unit 232 further includes a fifth resistor R5 and a sixth resistor R6. One end of the fifth resistor R5 is connected to the second current-carrying line 120 via a trip coil Lx, and the other end of the fifth resistor R5 is connected to one end of the fourth resistor R4, the emitter of the second triode Q2, and the second terminal b. The other end of the fourth resistor R4 is connected to one end of the sixth resistor R6, the base of the second triode Q2, and the fourth terminal d. The collector of the second triode Q2 is connected to the trigger module 240, and the other end of the sixth resistor R6 is connected to the first current-carrying line 110 via a first diode D1.

[0102] It can be understood that Figure 3 the embodiment shown in Figure 2 is the same in principle as the embodiment shown in Figure 3 , the difference is that in Figure 3 , both ends of the first resistor R1 are short-circuited by a part of the first shielding conductor structure 221 between the first terminal a and the third terminal c, a connecting conductor between the third terminal c and the sixth terminal f, and a part of the second shielding conductor structure 222 between the sixth terminal f and the fifth terminal d; both ends of the fourth resistor R4 are short-circuited by a part of the first shielding conductor structure 221 between the second terminal b and the third terminal c, a connecting conductor between the third terminal c and the sixth terminal f, and a part of the second shielding conductor structure 222 between the sixth terminal f and the fourth terminal d.

[0103] In the detection and protection device provided in some embodiments of the present invention, the trigger module 240 further includes a trip coil Lx for generating an electromagnetic force to drive the switch module 210 to disconnect the power connection. The trip coil Lx is connected in series with the third switch unit 241 between the first current-carrying line 110 and the second current-carrying line 120. Specifically, referring to Figure 2, the third switch unit 241 includes a thyristor Q3, the trigger module 240 further includes a seventh resistor R7, the control electrode of the thyristor Q3 is respectively connected to one end of the seventh resistor R7, the positive electrode of the voltage stabilizing unit ZD1, and the open - circuit detection module 230. The other end of the seventh resistor R7 and the cathode of the thyristor Q3 are connected together and connected to the first current - carrying line 110 via a first diode D1. The anode of the thyristor Q3 is connected to the second current - carrying line 120 through a trip coil Lx. The trigger module 240 may further include a tenth resistor R10. One end of the seventh resistor R7 connected to the control electrode of the thyristor Q3 is connected together and then connected to the collector of the first triode Q1 and the collector of the second triode Q2 of the open - circuit detection module 230 via the tenth resistor R10.

[0104] It should be noted that when an open - circuit signal or a leakage signal is received at one end of the seventh resistor R7 connected to the control electrode of the thyristor Q3, a voltage can be generated across the seventh resistor R7 and provided to the base and cathode of the thyristor Q3, that is, a switching conduction signal is provided to the thyristor Q3, causing the thyristor Q3 to conduct, and further causing the trip coil Lx to be energized to generate an electromagnetic force to drive the switch module 210 to disconnect the power connection between the input end and the output end of the power line.

[0105] Refer to Figure 2 , in the detection and protection device provided in some embodiments of the present invention, the trigger module 240 further includes a first capacitor C1 connected in parallel with the seventh resistor R7.

[0106] It can be understood that when the first current - carrying line 110 is the live wire L and the second current - carrying line 120 is the neutral wire N, even if an open - circuit signal or a leakage signal is received at one end of the seventh resistor R7 connected to the control electrode of the thyristor Q3, the thyristor Q3 can only conduct in the negative half - cycle of the AC power supply. Therefore, by setting the first capacitor C1 connected in parallel with the seventh resistor R7, the first capacitor C1 can be charged when an open - circuit signal or a leakage signal is received in the positive half - cycle of the AC power supply, thereby increasing the potential of the control electrode of the thyristor Q3, and triggering the thyristor Q3 to conduct when the negative half - cycle of the AC power supply arrives.

[0107] Refer to Figure 2 , in the detection and protection device provided in some embodiments of the present invention, the trigger module 240 further includes a first diode D1 and a second diode D2. The other end of the seventh resistor R7 and the cathode of the thyristor Q3 are connected to the anodes of the first diode D1 and the second diode D2. The cathode of the first diode D1 is connected to the first current - carrying line 110, and the cathode of the second diode D2 is connected to the connection point of the thyristor Q3 and the trip coil Lx.

[0108] Refer to Figure 2, in the detection and protection device provided by some embodiments of the present invention, it further includes a leakage simulation module 250. The leakage simulation module 250 includes a first test switch TEST1. One end of the first test switch TEST1 is connected to the second current-carrying line 120, and the other end is connected to the first shielding conductor structure 221 and / or the second shielding conductor structure 222. Preferably, the other end of the first test switch TEST1 is connected to one of the first end a, the second end b, the third end c, the fourth end d, the fifth end e, and the sixth end f.

[0109] It can be understood that when the first test switch TEST1 is pressed, the first test switch TEST1 connects the second current-carrying line 120 to the first shielding conductor structure 221 or the second shielding conductor structure 222, that is, simulates the leakage signal of the second current-carrying line 120 being transmitted to the first shielding conductor structure 221 or the second shielding conductor structure 222, so as to test whether the leakage detection function of the detection and protection device is intact.

[0110] It can also be understood that in Figure 2 the embodiments, one end of the first test switch TEST1 is not directly connected to the second current-carrying line 120, but is connected to the second current-carrying line 120 via a trip coil Lx. In some other embodiments, one end of the first test switch TEST1 can also be changed to be directly connected to the second current-carrying line 120.

[0111] In addition, one end of the first test switch TEST1 can also be directly or indirectly connected to the first current-carrying line 110, rather than being connected to the second current-carrying line 120.

[0112] Referring to Figure 3 and Figure 4 , in the detection and protection device provided by some embodiments of the present invention, the leakage simulation module 250, in addition to including the first test switch TEST1, further includes an eighth resistor R8 and a ninth resistor R9. One end of the first test switch TEST1 is connected to the second current-carrying line 120, and the other end of the first test switch TEST1 is respectively connected to one end of the eighth resistor R8 and one end of the ninth resistor R9. The other ends of the eighth resistor R8 and the ninth resistor R9 are respectively connected to two of the first end a, the second end b, the third end c, the fourth end d, the fifth end e, and the sixth end f.

[0113] It can be understood that when the first test switch TEST1 is pressed, it can simulate the leakage signal of the second current-carrying line 120 being transmitted to two positions in the first shielding conductor structure 221 and the second shielding conductor structure 222, so as to test whether the leakage detection function of the detection and protection device is intact.

[0114] Similarly, in Figure 4In the illustrated embodiment, one end of the first test switch TEST1 may also be directly or indirectly connected to the first current-carrying line 110 instead of being connected to the second current-carrying line 120.

[0115] Referring Figure 5 , in the detection and protection device provided in some embodiments of the present invention, a second test switch TEST2 is further included. One end of the second test switch TEST2 is connected to the second current-carrying line 120, and the other end is connected to the control pin of the third switch unit 241, that is, connected to the control electrode of the thyristor Q3.

[0116] When the second test switch TEST2 is pressed, the second current-carrying line 120 directly provides a turn-on control signal to the control electrode of the thyristor Q3, simulating that the trigger module 240 receives a leakage signal or an open-circuit signal, so as to test whether the trigger module 240 and the switch module 210 can work properly.

[0117] Referring Figure 6 , in the detection and protection device provided in some embodiments of the present invention, a leakage simulation module 250 is further included. The leakage simulation module 250 includes a third test switch TEST3 and a fourteenth resistor R14. One end of the third test switch TEST3 is connected to the second current-carrying line 120, and the other end is connected to the first shielding conductor structure 221 and / or the second shielding conductor structure 222 through the fourteenth resistor R14. The fourteenth resistor R14 is configured to: when the third test switch TEST3 is pressed and the open-circuit detection module 230 fails, adjust the potential of the negative electrode of the voltage stabilizing unit ZD1 so that the voltage stabilizing unit ZD1 is not broken down.

[0118] In this embodiment, for the voltage stabilizing unit ZD1, its positive electrode is connected to the control electrode of the thyristor Q3, and its negative electrode is connected to any one of the first terminal a, the second terminal b, the third terminal c, the fourth terminal d, the fifth terminal e, and the sixth terminal f through the eleventh resistor R11. When there is no open circuit in the first shielding conductor structure 221 and the second shielding conductor structure 222 in the leakage detection module 220, the first terminal a, the second terminal b, the third terminal c, the fourth terminal d, the fifth terminal e, and the sixth terminal f are all equipotential points, and their potentials are determined by the series voltage division of the first equivalent resistance after the parallel connection of the second resistor R2 and the fifth resistor R5 and the second equivalent resistance after the parallel connection of the third resistor R3 and the sixth resistor R6. When there is no open circuit in the first shielding conductor structure 221 and the second shielding conductor structure 222, the voltage division is at a normal level and will not cause the voltage stabilizing unit ZD1 to be broken down. When the third test switch TEST3 is pressed, it is equivalent to the parallel connection of the fourteenth resistor R14 with the second resistor R2 and the fifth resistor R5, which makes the first equivalent resistance smaller, resulting in the increase of the potentials of the first shielding conductor structure 221 and the second shielding conductor structure 222, and will cause the voltage stabilizing unit ZD1 to be broken down, thereby increasing the voltage of the control electrode of the thyristor Q3. When it comes to the negative half cycle of the AC power supply, that is, the level of the second current-carrying line 120 is greater than the level of the first current-carrying line 110, the thyristor Q3 conducts, forming a strong current path of the second current-carrying line 120 - the trip coil Lx - the thyristor Q3 - the first diode D1 - the first current-carrying line 110; the trip coil Lx generates a strong electromagnetic force, thereby driving the switch module 210 to disconnect the power connection between the input end and the output end of the power line. When an open circuit fault occurs in the second resistor R2 or the fifth resistor R5 in the open circuit detection module 230, it will cause the first equivalent resistance to become larger and the potentials of the first shielding conductor structure 221 and the second shielding conductor structure 222 to drop. At this time, when the third test switch TEST3 is pressed again, although it will cause the potentials of the first shielding conductor structure 221 and the second shielding conductor structure 222 to rise, by reasonably configuring the resistance value of the fourteenth resistor R14, the degree of the rise of the potentials of the first shielding conductor structure 221 and the second shielding conductor structure 222 will not be too large, and pressing the third test switch TEST3 is not enough to break down the voltage stabilizing unit ZD1. Therefore, when a fault occurs in the open circuit detection module 230 and the user presses the third test switch TEST3 for testing, the voltage stabilizing unit ZD1 is not broken down, and the trip coil Lx will not drive the switch module 210 to disconnect the power connection. At this time, the user can judge that the detection and protection device is abnormal.

[0119] It can also be understood that in Figure 6In the embodiment, one end of the third test switch TEST3 is not directly connected to the second current-carrying line 120, but is connected to the second current-carrying line 120 via a tripping coil Lx. In some other embodiments, one end of the third test switch TEST3 can also be changed to be directly connected to the second current-carrying line 120. Additionally, one end of the third test switch TEST3 can also be directly or indirectly connected to the first current-carrying line 110 instead of being connected to the second current-carrying line 120.

[0120] In addition, in Figures 2 to 6 the shown embodiment, the detection and protection device further includes an LED indication unit 260 connected in parallel with the thyristor Q3. The LED indication unit 260 includes a twelfth resistor R12, a thirteenth resistor R13, and a light-emitting diode LED1 connected in series. The connection point of the thyristor Q3 and the tripping coil Lx is connected to one end of the thirteenth resistor R13, the other end of the thirteenth resistor R13 is connected to one end of the twelfth resistor R12, the other end of the twelfth resistor R12 is connected to the positive electrode of the light-emitting diode LED1, the negative electrode of the light-emitting diode LED1 is connected to the positive electrode of the first diode D1, and the negative electrode of the first diode D1 is connected to the first current-carrying line 110.

[0121] In addition, it can also be seen that the detection and protection device further includes a lightning protection unit 270. The lightning protection unit 270 includes a first varistor ZR1 disposed between the first current-carrying line 110 and the second current-carrying line 120; the trigger module 240 further includes a second varistor ZR2 connected in parallel with the thyristor Q3. It can be understood that a varistor is a resistor device with non-linear volt-ampere characteristics, mainly used for voltage clamping when the circuit is subjected to overvoltage and absorbing excess current to protect sensitive devices.

[0122] Next, taking Figure 2 the shown embodiment as an example, the operation of the detection and protection device provided by the embodiments of the present invention in various leakage and open-circuit situations will be introduced:

[0123] 1. When the leakage signal of the first current-carrying line 110 is transmitted to the first shielding conductor structure 221:

[0124] After the first shielding conductor structure 221 obtains the leakage signal, the voltage stabilizing unit ZD1 is broken down, forming a conduction path of the first current-carrying line 110 - the first shielding conductor structure 221 - the eleventh resistor R11 - the voltage stabilizing unit ZD1 - the seventh resistor R7 - the second diode D2 - the tripping coil Lx - the second current-carrying line 120;

[0125] The voltage of the control electrode of thyristor Q3 increases. When it reaches the negative half-cycle of the AC power supply, that is, when the level of the second current-carrying line 120 is greater than the level of the first current-carrying line 110, the thyristor Q3 conducts, forming a strong current path of the second current-carrying line 120 - trip coil Lx - thyristor Q3 - first diode D1 - first current-carrying line 110;

[0126] The trip coil Lx generates a strong electromagnetic force, thereby driving the switch module 210 to disconnect the power connection between the input end and the output end of the power line.

[0127] 2. When the leakage signal of the second current-carrying line 120 is transmitted to the second shielding conductor structure 222:

[0128] After the second shielding conductor structure 222 obtains the leakage signal, the voltage regulator unit ZD1 is broken down, forming a conduction path of the second current-carrying line 120 - second shielding conductor structure 222 - eleventh resistor R11 - voltage regulator unit ZD1 - seventh resistor R7 - first diode D1 - first current-carrying line 110;

[0129] The voltage of the control electrode of thyristor Q3 increases. When it reaches the negative half-cycle of the AC power supply, that is, when the level of the second current-carrying line 120 is greater than the level of the first current-carrying line 110, the thyristor Q3 conducts, forming a strong current path of the second current-carrying line 120 - trip coil Lx - thyristor Q3 - first diode D1 - first current-carrying line 110;

[0130] The trip coil Lx generates a strong electromagnetic force, thereby driving the switch module 210 to disconnect the power connection between the input end and the output end of the power line.

[0131] 3. When the part of the first shielding conductor structure 221 between the first end a and the third end c is open:

[0132] The short-circuit path between the first end a and the fourth end d is disconnected, and the two ends of the first resistor R1 are no longer short-circuited; the two ends of the fourth resistor R4 are still short-circuited. As shown by the arrow in Figure 7 , the fourth resistor R4 is short-circuited by the conduction path of the second end b - third end c - sixth end f - fifth end e; it should be noted that the conduction path of the second end b - third end c - sixth end f - fourth end d also exists simultaneously;

[0133] A conduction path of the second current-carrying line 120 - trip coil Lx - second resistor R2 - first resistor R1 - third resistor R3 - first diode D1 - first current-carrying line 110 is formed;

[0134] The first triode Q1 is turned on, while the second triode Q2 remains off; a conduction path of the second current-carrying line 120 - the trip coil Lx - the second resistor R2 - the first triode Q1 - the tenth resistor R10 - the seventh resistor R7 - the first diode D1 - the first current-carrying line 110 is formed;

[0135] The voltage at the control electrode of the thyristor Q3 increases. When it reaches the negative half-cycle of the AC power supply, that is, when the level of the second current-carrying line 120 is greater than that of the first current-carrying line 110, the thyristor Q3 is turned on, forming a strong current path of the second current-carrying line 120 - the trip coil Lx - the thyristor Q3 - the first diode D1 - the first current-carrying line 110;

[0136] The trip coil Lx generates a strong electromagnetic force, thereby driving the switch module 210 to disconnect the power connection between the input end and the output end of the power line.

[0137] 4. When a part of the first shielding conductor structure 221 between the second end b and the third end c is open:

[0138] The short-circuit path between the second end b and the fifth end e is disconnected, and the two ends of the fourth resistor R4 are no longer short-circuited; the two ends of the first resistor R1 are still short-circuited. As shown by the arrow in Figure 8 , the conduction path of the first end a - the third end c - the sixth end f - the fourth end d short-circuits the first resistor R1; it should be noted that the conduction path of the first end a - the third end c - the sixth end f - the fifth end e also exists simultaneously;

[0139] A conduction path of the second current-carrying line 120 - the trip coil Lx - the fifth resistor R5 - the fourth resistor R4 - the sixth resistor R6 - the first diode D1 - the first current-carrying line 110 is formed;

[0140] The second triode Q2 is turned on, while the first triode Q1 remains off; a conduction path of the second current-carrying line 120 - the trip coil Lx - the fifth resistor R5 - the second triode Q2 - the tenth resistor R10 - the seventh resistor R7 - the first diode D1 - the first current-carrying line 110 is formed;

[0141] The voltage at the control electrode of the thyristor Q3 increases. When it reaches the negative half-cycle of the AC power supply, that is, when the level of the second current-carrying line 120 is greater than that of the first current-carrying line 110, the thyristor Q3 is turned on, forming a strong current path of the second current-carrying line 120 - the trip coil Lx - the thyristor Q3 - the first diode D1 - the first current-carrying line 110;

[0142] The trip coil Lx generates a strong electromagnetic force, thereby driving the switch module 210 to disconnect the power connection between the input end and the output end of the power line.

[0143] 5. When the connecting conductor between the third end c and the sixth end f is open:

[0144] The short - circuit path between the first terminal a and the fourth terminal d is disconnected, and the two ends of the first resistor R1 are no longer short - circuited; the short - circuit path between the second terminal b and the fifth terminal e is disconnected, and the two ends of the fourth resistor R4 are no longer short - circuited, refer to Figure 9 as shown;

[0145] A conduction path of the second current - carrying line 120 - trip coil Lx - second resistor R2 - first resistor R1 - third resistor R3 - first diode D1 - first current - carrying line 110 is formed, and a conduction path of the second current - carrying line 120 - trip coil Lx - fifth resistor R5 - fourth resistor R4 - sixth resistor R6 - first diode D1 - first current - carrying line 110 is formed;

[0146] Make both the first triode Q1 and the second triode Q2 conduct; a conduction path of the second current - carrying line 120 - trip coil Lx - second resistor R2 - first triode Q1 - tenth resistor R10 - seventh resistor R7 - first diode D1 - first current - carrying line 110 is formed, and a conduction path of the second current - carrying line 120 - trip coil Lx - fifth resistor R5 - second triode Q2 - tenth resistor R10 - seventh resistor R7 - first diode D1 - first current - carrying line 110 is formed;

[0147] The voltage of the control electrode of the thyristor Q3 increases. When it reaches the negative half - cycle of the AC power supply, that is, the level of the second current - carrying line 120 is greater than the level of the first current - carrying line 110, the thyristor Q3 conducts, and a strong - current path of the second current - carrying line 120 - trip coil Lx - thyristor Q3 - first diode D1 - first current - carrying line 110 is formed;

[0148] The trip coil Lx generates a strong electromagnetic force, thereby driving the switch module 210 to disconnect the power connection between the input end and the output end of the power line.

[0149] 6. When the part of the second shielding conductor structure 222 between the fourth terminal d and the sixth terminal f is open - circuited:

[0150] The short - circuit path between the first terminal a and the fourth terminal d is disconnected, and the two ends of the first resistor R1 are no longer short - circuited; the two ends of the fourth resistor R4 are still short - circuited. As shown by the arrow in Figure 10 , the fourth resistor R4 is short - circuited by the conduction path of the second terminal b - third terminal c - sixth terminal f - fifth terminal e; it should be noted that the conduction path of the first terminal a - third terminal c - sixth terminal f - fifth terminal e also exists simultaneously;

[0151] A conduction path of the second current - carrying line 120 - trip coil Lx - second resistor R2 - first resistor R1 - third resistor R3 - first diode D1 - first current - carrying line 110 is formed;

[0152] Turn on the first triode Q1, while the second triode Q2 remains cut off; form a conduction path of the second current-carrying line 120 - trip coil Lx - second resistor R2 - first triode Q1 - tenth resistor R10 - seventh resistor R7 - first diode D1 - first current-carrying line 110;

[0153] The voltage at the control electrode of the thyristor Q3 increases. When it reaches the negative half-cycle of the AC power supply, that is, when the level of the second current-carrying line 120 is greater than that of the first current-carrying line 110, the thyristor Q3 conducts, forming a strong current path of the second current-carrying line 120 - trip coil Lx - thyristor Q3 - first diode D1 - first current-carrying line 110;

[0154] The trip coil Lx generates a strong electromagnetic force, thereby driving the switch module 210 to disconnect the power connection between the input end and the output end of the power line.

[0155] 7. When a part of the second shielding conductor structure 222 between the fifth end e and the sixth end f is open:

[0156] The short-circuit path between the second end b and the fifth end e is disconnected, and the two ends of the fourth resistor R4 are no longer short-circuited; the two ends of the first resistor R1 are still short-circuited. As shown by the arrow in Figure 11 The first resistor R1 is short-circuited by the conduction path of the first end a - third end c - sixth end f - fourth end d; it should be noted that the conduction path of the second end b - third end c - sixth end f - fourth end d also exists;

[0157] Form a conduction path of the second current-carrying line 120 - trip coil Lx - fifth resistor R5 - fourth resistor R4 - sixth resistor R6 - first diode D1 - first current-carrying line 110;

[0158] Turn on the second triode Q2, while the first triode Q1 remains cut off; form a conduction path of the second current-carrying line 120 - trip coil Lx - fifth resistor R5 - second triode Q2 - tenth resistor R10 - seventh resistor R7 - first diode D1 - first current-carrying line 110;

[0159] The voltage at the control electrode of the thyristor Q3 increases. When it reaches the negative half-cycle of the AC power supply, that is, when the level of the second current-carrying line 120 is greater than that of the first current-carrying line 110, the thyristor Q3 conducts, forming a strong current path of the second current-carrying line 120 - trip coil Lx - thyristor Q3 - first diode D1 - first current-carrying line 110;

[0160] The trip coil Lx generates a strong electromagnetic force, thereby driving the switch module 210 to disconnect the power connection between the input end and the output end of the power line.

[0161] 8. When the first test switch TEST1 is pressed:

[0162] The first test switch TEST1 simulates the leakage signal transmission of the second current-carrying line 120 to the first shielding conductor structure 221 or the second shielding conductor structure 222;

[0163] After the first shielding conductor structure 221 or the second shielding conductor structure 222 obtains the leakage signal, the voltage stabilizing unit ZD1 is broken down, forming a conduction path of the second current-carrying line 120 - trip coil Lx - first test switch TEST1 - first shielding conductor structure 221 / second shielding conductor structure 222 - voltage stabilizing unit ZD1 - seventh resistor R7 - first diode D1 - first current-carrying line 110;

[0164] The voltage at the control electrode of the thyristor Q3 increases. When it reaches the negative half-cycle of the AC power supply, that is, the level of the second current-carrying line 120 is greater than the level of the first current-carrying line 110, the thyristor Q3 conducts, forming a strong current path of the second current-carrying line 120 - trip coil Lx - thyristor Q3 - first diode D1 - first current-carrying line 110;

[0165] The trip coil Lx generates a strong electromagnetic force, thereby driving the switch module 210 to disconnect the power connection between the input end and the output end of the power line.

[0166] Referring to Figure 12 , another embodiment of the present invention further provides a detection and protection device. Compared with Figure 2 the embodiment shown, the difference is that the control pin of the third switch unit 241 in the trigger module 240 obtains an open-circuit signal through the voltage stabilizing unit ZD1. Specifically, the collector of the first triode Q1 and the collector of the second triode Q2 are connected together and connected to one end of the tenth resistor R10. The other end of the tenth resistor R10 is connected to one end of the eleventh resistor R11 and the negative electrode of the voltage stabilizing unit ZD1. The other end of the eleventh resistor R11 is connected to one of the first end a, the second end b, the third end c, the fourth end d, the fifth end e, and the sixth end f.

[0167] It can be understood that with such a setting, the open-circuit signal generated by the open-circuit detection module 230 is not directly transmitted to the trigger module 240, but first transmitted to the voltage stabilizing unit ZD1 and then to the trigger module 240. Moreover, the open-circuit signal generated by the open-circuit detection module 230 can be separated from the leakage detection module 210 through the eleventh resistor R11.

[0168] Referring to Figure 13 , in the detection and protection device provided in some embodiments of the present invention, compared with Figure 6 the detection and protection device shown, it has the same switch module 210, leakage detection module 220, leakage simulation module 250, LED indication unit 260, and lightning protection unit 270. Figure 6The open - circuit detection module 230 and the trigger module 240 in the shown detection and protection device have been modified. Specifically:

[0169] The first switch unit 231 includes the first triode Q1, and the first bias unit includes the first resistor R1 and the twelfth resistor R12; the second switch unit 232 includes the second triode Q2, and the second bias unit includes the fourth resistor R4 and the thirteenth resistor R13;

[0170] The open - circuit detection module 230 further includes the second resistor R2, the third resistor R3, the fifth resistor R5, and the sixth resistor R6;

[0171] The emitter of the first triode Q1 is connected to one end of the first resistor R1, the first terminal a, and one end of the second resistor R2. The base of the first triode Q1 is connected to the other end of the first resistor R1 and one end of the twelfth resistor R12. The other end of the twelfth resistor R12 is connected to the fourth terminal d and one end of the third resistor R3;

[0172] The emitter of the second triode Q2 is connected to one end of the fourth resistor R4, the second terminal b, and one end of the fifth resistor R5. The base of the second triode Q2 is connected to the other end of the fourth resistor R4 and one end of the thirteenth resistor R13. The other end of the thirteenth resistor R13 is connected to the fifth terminal e and one end of the sixth resistor R6;

[0173] The other end of the second resistor R2 and the other end of the fifth resistor R5 are connected together and connected to one of the first current - carrying line 110 and the second current - carrying line 120. The other end of the third resistor R3 and the other end of the sixth resistor R6 are connected together and connected to the other of the first current - carrying line 110 and the second current - carrying line 120. The collector of the first triode Q1 and the collector of the second triode Q2 are connected together and connected to the trigger module 240.

[0174] Similarly, in this embodiment, since both ends of the first bias unit (the first resistor R1 and the twelfth resistor R12) are respectively connected to the first terminal a and the fourth terminal d, and the first terminal a and the fourth terminal d are short-circuited by the part of the first shielding conductor structure 221 between the first terminal a and the third terminal c, the connecting conductor between the third terminal c and the sixth terminal f, and the part of the second shielding conductor structure 222 between the sixth terminal f and the fourth terminal d, that is, both ends of the first bias unit are short-circuited and cannot provide a switching conduction signal for the first triode Q1; similarly, since both ends of the second bias unit (the fourth resistor R4 and the thirteenth resistor R13) are respectively connected to the second terminal b and the fifth terminal e, and the second terminal b and the fifth terminal e are short-circuited by the part of the first shielding conductor structure 221 between the second terminal b and the third terminal c, the connecting conductor between the third terminal c and the sixth terminal f, and the part of the second shielding conductor structure 222 between the sixth terminal f and the fifth terminal e, that is, both ends of the second bias unit are short-circuited and cannot provide a switching conduction signal for the second triode Q2.

[0175] In addition, when any part of the first shielding conductor structure 221 and the second shielding conductor structure 222 between the first end a and the fourth end d is open-circuited, that is, when the part of the first shielding conductor structure 221 between the first end a and the third end c is open-circuited, or when the part of the second shielding conductor structure 222 between the sixth end f and the fourth end d is open-circuited, the two ends of the first biasing unit are no longer short-circuited, the first resistor R1 and the twelfth resistor R12 can bear the voltage division, and the voltage division across the first resistor R1 is equivalent to providing a biasing voltage to the emitter junction of the first triode Q1 to turn on the first triode Q1. Then, under the action of the electric energy provided by the first current-carrying line 110 or the second current-carrying line 120, an open-circuit signal is sent to the trigger module 240. Similarly, when any part of the first shielding conductor structure 221 and the second shielding conductor structure 222 between the second end b and the fifth end e is open-circuited, that is, when the part of the first shielding conductor structure 221 between the second end b and the third end c is open-circuited, or when the part of the second shielding conductor structure 222 between the sixth end f and the fifth end e is open-circuited, the two ends of the second biasing unit are no longer short-circuited, the fourth resistor R4 and the thirteenth resistor R13 can bear the voltage division, and the voltage division across the fourth resistor R4 is equivalent to providing a biasing voltage to the emitter junction of the second triode Q2 to turn on the second triode Q2. Then, under the action of the electric energy provided by the first current-carrying line 110 or the second current-carrying line 120, an open-circuit signal is sent to the trigger module 240. It should also be noted that when the connecting conductor between the third end c and the sixth end f is disconnected, both the first end a and the fourth end d and the second end b and the fifth end e are no longer short-circuited, that is, the two ends of the first biasing unit and the two ends of the second biasing unit are no longer short-circuited. Thus, a switching conduction signal can be provided to the first triode Q1 and the second triode Q2 at the same time, and then the first triode Q1 and the second triode Q2 send open-circuit signals to the trigger module 240 at the same time.

[0176] Referring to Figure 13 , in the detection and protection device provided in some embodiments of the present invention, the trigger module 240 includes a voltage stabilizing unit ZD1 and a third switch unit 241 that drives the switch module 210 to disconnect the power connection when conducting. The control pin of the third switch unit 241 is connected to the collector of the first triode Q1 and the collector of the second triode Q2 to obtain an open-circuit signal. The negative pole of the voltage stabilizing unit ZD1 is connected to the first shielding conductor structure 221 and / or the second shielding conductor structure 222 to obtain a leakage signal in the first shielding conductor structure 221 and / or the second shielding conductor structure 222, and the positive pole of the voltage stabilizing unit ZD1 is connected to the control pin of the third switch unit 241.

[0177] It can be understood that since the first shielding conductor structure 221 and the second shielding conductor structure 222 have been connected together through the third terminal c of the first shielding conductor structure 221 and the sixth terminal f of the second shielding conductor structure 222, therefore, when there is no short circuit in the connection conductor between the first shielding conductor structure 221, the second shielding conductor structure 222, and the third terminal c and the sixth terminal f, the negative electrode of the voltage stabilizing unit ZD1 only needs to be connected to any point in the first shielding conductor structure 221 and the second shielding conductor structure 222, and the leakage signals detected at any other position of the first shielding conductor structure 221 and the second shielding conductor structure 222 can be transmitted to the negative electrode of the voltage stabilizing unit ZD1.

[0178] It should be noted that the control pin of the third switching unit 241 can be directly connected to the open-circuit detection module 230 to obtain an open-circuit signal, or can be indirectly connected to the open-circuit detection module 230. For example, referring to Figure 13 As shown, the trigger module 240 further includes a tenth resistor R10, and the control pin of the third switching unit 241 is indirectly connected to the open-circuit detection module 230 through the tenth resistor R10, that is, the control pin of the third switching unit 241 is connected to one end of the tenth resistor R10, and the other end of the tenth resistor R10 is connected to the collector of the first triode Q1 and the collector of the second triode Q2; similarly, the negative electrode of the voltage stabilizing unit ZD1 can be directly connected to the first shielding conductor structure 221 and / or the second shielding conductor structure 222, or can be indirectly connected to the first shielding conductor structure 221 and / or the second shielding conductor structure 222. For example, referring to Figure 13 As shown, the trigger module 240 further includes an eleventh resistor R11, and the negative electrode of the voltage stabilizing unit ZD1 is connected to the first shielding conductor structure 221 and / or the second shielding conductor structure 222 through the eleventh resistor R11, that is, the negative electrode of the voltage stabilizing unit ZD1 is connected to one end of the eleventh resistor R11, and the other end of the eleventh resistor R11 is connected to any one of the first terminal a, the second terminal b, the third terminal c, the fourth terminal d, the fifth terminal e, and the sixth terminal f; in addition, the positive electrode of the voltage stabilizing unit ZD1 can be directly connected to the control pin of the third switching unit 241, or can be indirectly connected to the control pin of the third switching unit 241. For example, referring to Figure 13 As shown, the positive electrode of the voltage stabilizing unit ZD1 is connected to the control pin of the third switching unit 241 via the tenth resistor R10.

[0179] Referring to Figure 13, in the detection and protection device provided by some embodiments of the present invention, a leakage simulation module 250 is further included. The leakage simulation module 250 includes a third test switch TEST3. One end of the third test switch TEST3 is connected to the connection point of the second resistor R2 and the fifth resistor R5, and the other end of the third test switch TEST3 is connected to the first shielding conductor structure 221 and / or the second shielding conductor structure 222. Preferably, the other end of the third test switch TEST3 is connected to one of the first end a, the second end b, the third end c, the fourth end d, the fifth end e, and the sixth end f.

[0180] It can be understood that when the third test switch TEST3 is pressed, the third test switch TEST3 connects the second current-carrying line 120 to the first shielding conductor structure 221 or the second shielding conductor structure 222, that is, simulates the leakage signal of the second current-carrying line 120 being transmitted to the first shielding conductor structure 221 or the second shielding conductor structure 222, so as to test whether the leakage detection function of the detection and protection device is intact. It can also be understood that in the Figure 13 embodiment, one end of the third test switch TEST3 is not directly connected to the second current-carrying line 120, but is connected to the second current-carrying line 120 via the trip coil Lx. In some other embodiments, one end of the third test switch TEST3 can also be changed to be directly connected to the second current-carrying line 120. In addition, one end of the third test switch TEST3 can also be directly or indirectly connected to the first current-carrying line 110 instead of being connected to the second current-carrying line 120.

[0181] Referring to Figure 13 , in the detection and protection device provided by some embodiments of the present invention, the leakage simulation module 250 further includes a fourteenth resistor R14. The other end of the third test switch TEST3 is connected to one end of the fourteenth resistor R14, and the other end of the fourteenth resistor R14 is connected to one of the first end a, the second end b, the third end c, the fourth end d, the fifth end e, and the sixth end f; the negative electrode of the voltage stabilizing unit ZD1 is connected to one of the first end a, the second end b, the third end c, the fourth end d, the fifth end e, and the sixth end f; the fourteenth resistor R14 is configured to: when the third test switch TEST3 is pressed and the open-circuit detection module 230 fails, adjust the potential of the negative electrode of the voltage stabilizing unit ZD1 so that the voltage stabilizing unit ZD1 is not broken down.

[0182] In this embodiment, for the voltage stabilizing unit ZD1, its positive electrode is connected to the control electrode of the thyristor Q3 through the tenth resistor R10, and its negative electrode is connected to any one of the first terminal a, the second terminal b, the third terminal c, the fourth terminal d, the fifth terminal e, and the sixth terminal f through the eleventh resistor R11. When there is no open circuit in the first shielding conductor structure 221 and the second shielding conductor structure 222 in the leakage detection module 220, the first terminal a, the second terminal b, the third terminal c, the fourth terminal d, the fifth terminal e, and the sixth terminal f are all equipotential points, and their potentials are determined by the series voltage division of the first equivalent resistance after the parallel connection of the second resistor R2 and the fifth resistor R5 and the second equivalent resistance after the parallel connection of the third resistor R3 and the sixth resistor R6. When there is no open circuit in the first shielding conductor structure 221 and the second shielding conductor structure 222, the voltage division is at a normal level and will not cause the voltage stabilizing unit ZD1 to be broken down. When the third test switch TEST3 is pressed, it is equivalent to connecting the fourteenth resistor R14 in parallel with the second resistor R2 and the fifth resistor R5, making the first equivalent resistance smaller, resulting in an increase in the potentials of the first shielding conductor structure 221 and the second shielding conductor structure 222, which will cause the voltage stabilizing unit ZD1 to be broken down, thereby increasing the voltage of the control electrode of the thyristor Q3. When the negative half-cycle of the AC power supply arrives, that is, the level of the second current-carrying line 120 is greater than the level of the first current-carrying line 110, the thyristor Q3 conducts, forming a strong current path of the second current-carrying line 120 - the trip coil Lx - the thyristor Q3 - the first diode D1 - the first current-carrying line 110; the trip coil Lx generates a strong electromagnetic force, thereby driving the switch module 210 to disconnect the power connection between the input end and the output end of the power line. Exemplarily, when the second resistor R2 or the fifth resistor R5 has an open circuit fault in the open circuit detection module 230, it will cause the first equivalent resistance to become larger and the potentials of the first shielding conductor structure 221 and the second shielding conductor structure 222 to drop. At this time, when the third test switch TEST3 is pressed again, although it will cause the potentials of the first shielding conductor structure 221 and the second shielding conductor structure 222 to rise, by reasonably configuring the resistance value of the fourteenth resistor R14, the degree of the potential rise of the first shielding conductor structure 221 and the second shielding conductor structure 222 will not be too large, and pressing the third test switch TEST3 is not sufficient to break down the voltage stabilizing unit ZD1. Therefore, when the open circuit detection module 230 fails and the user presses the third test switch TEST3 for testing, the voltage stabilizing unit ZD1 is not broken down, and the trip coil Lx will not drive the switch module 210 to disconnect the power connection. At this time, the user can judge that the detection and protection device is abnormal.

[0183] Refer to Figure 14, in the detection and protection device for a power cord provided by a specific embodiment of the present invention: the power cord includes a first current-carrying line 110 and a second current-carrying line 120; the detection and protection device includes a switch module 210, a leakage detection module 220, an open-circuit detection module 230, a trigger module 240, and a leakage simulation module 250; specifically:

[0184] The switch module 210 is used to control the electrical connection between the input end and the output end of the power cord;

[0185] The leakage detection module 220 includes a first shielding conductor structure 221 covering the first current-carrying line 110 and a second shielding conductor structure 222 covering the second current-carrying line 120; the first shielding conductor structure 221 is used to collect the leakage signal of the first current-carrying line 110, and the second shielding conductor structure 222 is used to collect the leakage signal of the second current-carrying line 120; the first shielding conductor structure 221 includes a first end a near the input end of the power cord, a second end b near the output end of the power cord, and a third end c between the first end a and the second end b; the second shielding conductor structure 222 includes a fourth end d near the input end, a fifth end e near the output end, and a sixth end f between the fourth end d and the fifth end e; the third end c and the sixth end f are connected;

[0186] The open-circuit detection module 230 is respectively connected to the first end a, the second end b, the fourth end d, and the fifth end e. The open-circuit detection module 230 is configured to generate an open-circuit signal when at least a part of the first shielding conductor structure 221 and / or the second shielding conductor structure 222 is open; the open-circuit detection module 230 includes a first triode Q1, a first voltage-dividing unit 233, a second triode Q2, and a second voltage-dividing unit 234; the first voltage-dividing unit 233 includes a second resistor R2, a first resistor R1, a twelfth resistor R12, and a third resistor R3 connected in series in sequence, and the second voltage-dividing unit 234 includes a fifth resistor R5, a fourth resistor R4, a thirteenth resistor R13, and a sixth resistor R6 connected in series in sequence; the connection point of the second resistor R2 and the first resistor R1 is connected to the first end a and the emitter of the first triode Q1; the connection point of the first resistor R1 and the twelfth resistor R12 is connected to the base of the first triode Q1; the connection point of the twelfth resistor R12 and the third resistor R3 is connected to the fourth end d; the connection point of the fifth resistor R5 and the fourth resistor R4 is connected to the second end b and the emitter of the second triode Q2; the connection point of the fourth resistor R4 and the thirteenth resistor R13 is connected to the base of the second triode Q2; the connection point of the thirteenth resistor R13 and the sixth resistor R6 is connected to the fifth end e; the second resistor R2 and the fifth resistor R5 are connected together and connected to the second current-carrying line 120, and the third resistor R3 and the sixth resistor R6 are connected together and connected to the first current-carrying line 110;

[0187] The trigger module 240 is coupled to the leakage detection module 220, the open - circuit detection module 230, and the switch module 210, and is configured to receive a leakage signal and / or an open - circuit signal, and drive the switch module 210 to disconnect the power connection in response to the leakage signal and / or the open - circuit signal; the trigger module 240 includes a voltage - stabilizing unit ZD1 and a third switch unit 241 that drives the switch module 210 to disconnect the power connection when conducting; the control pin of the third switch unit 241 is connected to the collector of the first triode Q1 and the collector of the second triode Q2 to obtain an open - circuit signal; the positive electrode of the voltage - stabilizing unit ZD1 is connected to the control pin of the third switch unit 241, and the negative electrode is connected to the sixth terminal f to obtain a leakage signal;

[0188] The leakage simulation module 250 includes a third test switch TEST3 and a fourteenth resistor R14; one end of the third test switch TEST3 is connected to the connection point of the second resistor R2 and the fifth resistor R5, the other end of the third test switch TEST3 is connected to one end of the fourteenth resistor R14, and the other end of the fourteenth resistor R14 is connected to the third terminal c.

[0189] Next, Figure 14 the operation of the detection and protection device provided by the embodiments of the present invention in various leakage and open - circuit situations will be introduced with the embodiments shown below:

[0190] 1. When the leakage signal of the first current - carrying line 110 is transmitted to the first shield conductor structure 221:

[0191] After the first shield conductor structure 221 obtains the leakage signal, it is transmitted to the sixth terminal f, so that the voltage - stabilizing unit ZD1 is broken down, forming a conduction path of the first current - carrying line 110 - the first shield conductor structure 221 - the eleventh resistor R11 - the voltage - stabilizing unit ZD1 - the tenth resistor R10 - the seventh resistor R7 - the second diode D2 - the tripping coil Lx - the second current - carrying line 120;

[0192] The voltage at the control pole of the thyristor Q3 increases. When it reaches the negative half - cycle of the AC power supply, that is, the level of the second current - carrying line 120 is greater than the level of the first current - carrying line 110, the thyristor Q3 conducts, forming a strong - current path of the second current - carrying line 120 - the tripping coil Lx - the thyristor Q3 - the first diode D1 - the first current - carrying line 110;

[0193] The tripping coil Lx generates a strong electromagnetic force, thereby driving the switch module 210 to disconnect the power connection between the input end and the output end of the power line.

[0194] 2. When the leakage signal of the second current - carrying line 120 is transmitted to the second shield conductor structure 222:

[0195] After the second shielding conductor structure 222 obtains the leakage signal, it is transmitted to the sixth terminal f, so that the voltage stabilizing unit ZD1 is broken down, forming a conduction path of the second current-carrying line 120 - the second shielding conductor structure 222 - the eleventh resistor R11 - the voltage stabilizing unit ZD1 - the tenth resistor R10 - the seventh resistor R7 - the first diode D1 - the first current-carrying line 110;

[0196] The voltage of the control electrode of the thyristor Q3 increases. When it reaches the negative half-cycle of the AC power supply, that is, the level of the second current-carrying line 120 is greater than the level of the first current-carrying line 110, the thyristor Q3 conducts, forming a strong current path of the second current-carrying line 120 - the tripping coil Lx - the thyristor Q3 - the first diode D1 - the first current-carrying line 110;

[0197] The tripping coil Lx generates a strong electromagnetic force, thereby driving the switch module 210 to disconnect the power connection between the input end and the output end of the power line.

[0198] 3. When the part of the first shielding conductor structure 221 between the first terminal a and the third terminal c is open:

[0199] The short-circuit path between the first terminal a and the fourth terminal d is disconnected, and the two ends of the first biasing unit (the first resistor R1, the twelfth resistor R12) are no longer short-circuited; the two ends of the second biasing unit (the fourth resistor R4, the thirteenth resistor R13) are still short-circuited, and the second biasing unit is short-circuited by the conduction path of the second terminal b - the third terminal c - the sixth terminal f - the fifth terminal e; it should be noted that the conduction path of the second terminal b - the third terminal c - the sixth terminal f - the fourth terminal d also exists at the same time;

[0200] A conduction path of the second current-carrying line 120 - the tripping coil Lx - the second resistor R2 - the first resistor R1 - the twelfth resistor R12 - the third resistor R3 - the first diode D1 - the first current-carrying line 110 is formed;

[0201] The first triode Q1 is made to conduct, while the second triode Q2 remains cut off; a conduction path of the second current-carrying line 120 - the tripping coil Lx - the second resistor R2 - the first triode Q1 - the tenth resistor R10 - the seventh resistor R7 - the first diode D1 - the first current-carrying line 110 is formed;

[0202] The voltage of the control electrode of the thyristor Q3 increases. When it reaches the negative half-cycle of the AC power supply, that is, the level of the second current-carrying line 120 is greater than the level of the first current-carrying line 110, the thyristor Q3 conducts, forming a strong current path of the second current-carrying line 120 - the tripping coil Lx - the thyristor Q3 - the first diode D1 - the first current-carrying line 110;

[0203] The tripping coil Lx generates a strong electromagnetic force, thereby driving the switch module 210 to disconnect the power connection between the input end and the output end of the power line.

[0204] 4. When the part of the first shielding conductor structure 221 between the second end b and the third end c is open-circuited:

[0205] The short-circuit path between the second end b and the fifth end e is disconnected, and the two ends of the second biasing unit (the fourth resistor R4 and the thirteenth resistor R13) are no longer short-circuited; the two ends of the first biasing unit (the first resistor R1 and the twelfth resistor R12) are still short-circuited, and the conduction path of the first end a - the third end c - the sixth end f - the fourth end d shorts the first biasing unit; it should be noted that the conduction path of the first end a - the third end c - the sixth end f - the fifth end e exists simultaneously;

[0206] A conduction path of the second current-carrying line 120 - the trip coil Lx - the fifth resistor R5 - the fourth resistor R4 - the thirteenth resistor R13 - the sixth resistor R6 - the first diode D1 - the first current-carrying line 110 is formed;

[0207] The second triode Q2 is turned on, and the first triode Q1 remains cut off; a conduction path of the second current-carrying line 120 - the trip coil Lx - the fifth resistor R5 - the second triode Q2 - the tenth resistor R10 - the seventh resistor R7 - the first diode D1 - the first current-carrying line 110 is formed;

[0208] The voltage of the control electrode of the thyristor Q3 increases. When it reaches the negative half-cycle of the AC power supply, that is, the level of the second current-carrying line 120 is greater than the level of the first current-carrying line 110, the thyristor Q3 is turned on, and a strong current path of the second current-carrying line 120 - the trip coil Lx - the thyristor Q3 - the first diode D1 - the first current-carrying line 110 is formed;

[0209] The trip coil Lx generates a strong electromagnetic force, thereby driving the switch module 210 to disconnect the power connection between the input end and the output end of the power line.

[0210] 5. When the connecting conductor between the third end c and the sixth end f is open-circuited:

[0211] The short-circuit path between the first end a and the fourth end d is disconnected, and the two ends of the first biasing unit (the first resistor R1 and the twelfth resistor R12) are no longer short-circuited; the short-circuit path between the second end b and the fifth end e is disconnected, and the two ends of the second biasing unit (the fourth resistor R4 and the thirteenth resistor R13) are no longer short-circuited;

[0212] A conduction path of the second current-carrying line 120 - the trip coil Lx - the second resistor R2 - the first resistor R1 - the twelfth resistor R12 - the third resistor R3 - the first diode D1 - the first current-carrying line 110 is formed, and a conduction path of the second current-carrying line 120 - the trip coil Lx - the fifth resistor R5 - the fourth resistor R4 - the thirteenth resistor R13 - the sixth resistor R6 - the first diode D1 - the first current-carrying line 110 is formed;

[0213] Both the first triode Q1 and the second triode Q2 are turned on; a conduction path of the second current-carrying line 120 - trip coil Lx - second resistor R2 - first triode Q1 - tenth resistor R10 - seventh resistor R7 - first diode D1 - first current-carrying line 110 is formed, and a conduction path of the second current-carrying line 120 - trip coil Lx - fifth resistor R5 - second triode Q2 - tenth resistor R10 - seventh resistor R7 - first diode D1 - first current-carrying line 110 is formed;

[0214] The voltage of the control electrode of the thyristor Q3 increases. When it reaches the negative half-cycle of the AC power supply, that is, the level of the second current-carrying line 120 is greater than the level of the first current-carrying line 110, the thyristor Q3 is turned on, and a strong current path of the second current-carrying line 120 - trip coil Lx - thyristor Q3 - first diode D1 - first current-carrying line 110 is formed;

[0215] The trip coil Lx generates a strong electromagnetic force, thereby driving the switch module 210 to disconnect the power connection between the input end and the output end of the power line.

[0216] 6. When a part of the second shielding conductor structure 222 between the fourth end d and the sixth end f is open:

[0217] The short-circuit path between the first end a and the fourth end d is disconnected, and the two ends of the first biasing unit (first resistor R1, twelfth resistor R12) are no longer short-circuited; the two ends of the second biasing unit (fourth resistor R4, thirteenth resistor R13) are still short-circuited, and the second biasing unit is short-circuited by the conduction path of the second end b - third end c - sixth end f - fifth end e; it should be noted that the conduction path of the first end a - third end c - sixth end f - fifth end e exists simultaneously;

[0218] A conduction path of the second current-carrying line 120 - trip coil Lx - second resistor R2 - first resistor R1 - twelfth resistor R12 - third resistor R3 - first diode D1 - first current-carrying line 110 is formed;

[0219] The first triode Q1 is turned on, while the second triode Q2 remains cut off; a conduction path of the second current-carrying line 120 - trip coil Lx - second resistor R2 - first triode Q1 - tenth resistor R10 - seventh resistor R7 - first diode D1 - first current-carrying line 110 is formed;

[0220] The voltage of the control electrode of the thyristor Q3 increases. When it reaches the negative half-cycle of the AC power supply, that is, the level of the second current-carrying line 120 is greater than the level of the first current-carrying line 110, the thyristor Q3 is turned on, and a strong current path of the second current-carrying line 120 - trip coil Lx - thyristor Q3 - first diode D1 - first current-carrying line 110 is formed;

[0221] The trip coil Lx generates a strong electromagnetic force, thereby driving the switch module 210 to disconnect the power connection between the input end and the output end of the power line.

[0222] 7. When a part of the second shielding conductor structure 222 between the fifth end e and the sixth end f is open:

[0223] The short - circuit path between the second end b and the fifth end e is disconnected, and the two ends of the second biasing unit (the fourth resistor R4 and the thirteenth resistor R13) are no longer short - circuited; the two ends of the first biasing unit (the first resistor R1 and the twelfth resistor R12) are still short - circuited, and the first biasing unit is short - circuited by the conduction path of the first end a - the third end c - the sixth end f - the fourth end d; it should be noted that the conduction path of the second end b - the third end c - the sixth end f - the fourth end d also exists at the same time;

[0224] A conduction path of the second current - carrying line 120 - the trip coil Lx - the fifth resistor R5 - the fourth resistor R4 - the thirteenth resistor R13 - the sixth resistor R6 - the first diode D1 - the first current - carrying line 110 is formed;

[0225] The second triode Q2 is turned on, and the first triode Q1 remains cut - off; a conduction path of the second current - carrying line 120 - the trip coil Lx - the fifth resistor R5 - the second triode Q2 - the tenth resistor R10 - the seventh resistor R7 - the first diode D1 - the first current - carrying line 110 is formed;

[0226] The voltage of the control electrode of the thyristor Q3 increases. When it reaches the negative half - cycle of the AC power supply, that is, when the level of the second current - carrying line 120 is greater than the level of the first current - carrying line 110, the thyristor Q3 is turned on, and a strong current path of the second current - carrying line 120 - the trip coil Lx - the thyristor Q3 - the first diode D1 - the first current - carrying line 110 is formed;

[0227] The trip coil Lx generates a strong electromagnetic force, thereby driving the switch module 210 to disconnect the power connection between the input end and the output end of the power line.

[0228] 8. When the open - circuit detection module 230 is working normally and there is no open - circuit situation in the first shielding conductor structure 221 and the second shielding conductor structure 222:

[0229] The potentials on the first shielding conductor structure 221 and the second shielding conductor structure 222 in the leakage detection module 220 are determined by the series voltage division of the first equivalent resistance after the parallel connection of the second resistor R2 and the fifth resistor R5 and the second equivalent resistance after the parallel connection of the third resistor R3 and the sixth resistor R6, and are at a level that will not cause the voltage - stabilizing unit ZD1 to be broken down;

[0230] At this time, if the third test switch TEST3 is pressed, it is equivalent to connecting the fourteenth resistor R14 in parallel with the second resistor R2 and the fifth resistor R5, making the first equivalent resistance smaller, resulting in an increase in the potentials of the first shielding conductor structure 221 and the second shielding conductor structure 222, which will cause the voltage regulator unit ZD1 to be broken down, forming a conduction path of the second current-carrying line 120 - trip coil Lx - third test switch TEST3 - fourteenth resistor R14 - first shielding conductor structure 221 / second shielding conductor structure 222 - eleventh resistor R11 - voltage regulator unit ZD1 - tenth resistor R10 - seventh resistor R7 - first diode D1 - first current-carrying line 110;

[0231] The voltage at the control electrode of the thyristor Q3 increases. When it reaches the negative half-cycle of the AC power supply, that is, the level of the second current-carrying line 120 is greater than the level of the first current-carrying line 110, the thyristor Q3 conducts, forming a strong current path of the second current-carrying line 120 - trip coil Lx - thyristor Q3 - first diode D1 - first current-carrying line 110;

[0232] The trip coil Lx generates a strong electromagnetic force, thereby driving the switch module 210 to disconnect the power connection between the input end and the output end of the power line.

[0233] 9. When a fault occurs in the open-circuit detection module 230, such as an open circuit or a short circuit of a single device, it will cause a change in the potentials of the first shielding conductor structure 221 and the second shielding conductor structure 222, which will lead to two situations. One is that the increase in the potentials of the first shielding conductor structure 221 and the second shielding conductor structure 222 directly causes the voltage regulator unit ZD1 to be broken down, resulting in a trip; the other is that the potentials of the first shielding conductor structure 221 and the second shielding conductor structure 222 decrease, resulting in no trip when the user actively presses the third test switch TEST3 for testing.

[0234] The following lists various single-device faults that may occur in the open-circuit detection module 230:

[0235] 9.1. When the second resistor R2 in the open-circuit detection module 230 has an open-circuit fault, the first equivalent resistance becomes larger, resulting in a decrease in the potentials of the first shielding conductor structure 221 and the second shielding conductor structure 222, and the voltage regulator unit ZD1 remains in a non-breakdown state;

[0236] It should be noted that in this case, the open - circuit detection module 230 cannot trigger a trip in response to a partial open - circuit situation of the part of the first shield conductor structure 221 between the first end a and the third end c. However, it can still trigger a trip in response to four open - circuit situations, namely, a partial open - circuit of the first shield conductor structure 221 between the second end b and the third end c, an open - circuit of the connecting conductor between the third end c and the sixth end f, a partial open - circuit of the second shield conductor structure 222 between the fourth end d and the sixth end f, and a partial open - circuit of the second shield conductor structure 222 between the fifth end e and the sixth end f;

[0237] It can be seen that in this case, if a partial open - circuit situation of the first shield conductor structure 221 between the first end a and the third end c occurs, the user cannot detect it, which will pose a safety hazard.

[0238] 9.2. When the fifth resistor R5 in the open - circuit detection module 230 has an open - circuit fault, it is similar to the situation where the second resistor R2 has an open - circuit fault in 9.1.

[0239] 9.3. When the third resistor R3 in the open - circuit detection module 230 has an open - circuit fault, the second equivalent resistance becomes smaller, resulting in an increase in the potential of the first shield conductor structure 221 and the second shield conductor structure 222, which will cause the voltage - stabilizing unit ZD1 to be broken down and trigger a trip.

[0240] 9.4. When the sixth resistor R6 in the open - circuit detection module 230 has an open - circuit fault, it is similar to the situation where the third resistor R3 has an open - circuit fault in 9.3.

[0241] 9.5. When the first triode Q1 in the open - circuit detection module 230 has an open - circuit fault, the open - circuit detection module 230 cannot trigger a trip in response to a partial open - circuit situation of the first shield conductor structure 221 between the first end a and the third end c;

[0242] It can be seen that in this case, if a partial open - circuit situation of the first shield conductor structure 221 between the first end a and the third end c occurs, the user cannot detect it, which will pose a safety hazard.

[0243] 9.6. When the second triode Q2, the twelfth resistor R12, and the thirteenth resistor R13 in the open - circuit detection module 230 have open - circuit faults, it is similar to the situation where the first triode Q1 has an open - circuit fault in 9.5.

[0244] 9.7. When the second resistor R2 in the open - circuit detection module 230 has a short - circuit fault, the first equivalent resistance becomes zero, resulting in an increase in the potential of the first shield conductor structure 221 and the second shield conductor structure 222, which will cause the voltage - stabilizing unit ZD1 to be broken down and trigger a trip.

[0245] 9.8. When the fifth resistor R5 in the open - circuit detection module 230 has a short - circuit fault, it is similar to the situation where the second resistor R2 has a short - circuit fault in 9.7.

[0246] 9.9. When the third resistor R3 in the open - circuit detection module 230 has a short - circuit fault, the second equivalent resistance becomes zero, causing the potentials of the first shielding conductor structure 221 and the second shielding conductor structure 222 to drop, and the voltage - regulating unit ZD1 remains in a non - breakdown state.

[0247] 9.10. When the sixth resistor R6 in the open - circuit detection module 230 has a short - circuit fault, it is similar to the situation where the third resistor R3 has a short - circuit fault in 9.9.

[0248] 9.11. When the first triode Q1 in the open - circuit detection module 230 has a short - circuit fault, the voltage at the control electrode of the thyristor Q3 will increase and trigger tripping.

[0249] 9.12. When the second triode Q2 in the open - circuit detection module 230 has a short - circuit fault, it is similar to the situation where the first triode Q1 has a short - circuit fault in 9.11.

[0250] For the single - device fault situations of the open - circuit detection module 230 in the above 9.3, 9.4, 9.7, 9.8, 9.11, and 9.12, etc., it will directly cause tripping, so that the user will not continue to use this power cord;

[0251] For the single - device fault situations of the open - circuit detection module 230 in the above 9.1, 9.2, 9.5, 9.6, 9.9, and 9.10, etc., tripping will not be triggered and the user cannot detect it, which will pose a safety hazard; on this basis, if the user actively presses the third test switch TEST3 for testing, the potentials of the first shielding conductor structure 221 and the second shielding conductor structure 222 have been changed. After pressing the third test switch TEST3, the potentials of the first shielding conductor structure 221 and the second shielding conductor structure 222 are still not high enough to cause the voltage - regulating unit ZD1 to be broken down and trigger tripping, so that the user can visually see that no tripping occurs after pressing the third test switch TEST3, thereby determining that the detection and protection device is abnormal and cannot play the role of leakage protection or the role of open - circuit protection for the shielding structure, and then stop using this faulty product, further improving the safety guarantee.

[0252] Refer to Figure 15 According to, the second - aspect embodiment of the present invention provides an electrical connection device 300, including the detection and protection device as in the first - aspect embodiment above, a housing 310, and a power cord. The power cord is connected to the housing 310, and the switch module 210, the open - circuit detection module 230, and the trigger module 240 are arranged in the housing 310.

[0253] In addition, an embodiment of the third aspect of the present invention provides an electrical device, including a load device and the electrical connection device 300 as in the embodiment of the second aspect above, and the output end of the power supply line is connected to the load device.

[0254] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the scope of knowledge possessed by those of ordinary skill in the art.

Claims

1. A detection and protection device for a power line, characterized in that: The power line includes a first current-carrying line and a second current-carrying line, and the detection protection device includes: A switch module, used to control the power connection between the input end and the output end of the power line; A leakage detection module, comprising a first shielded conductor structure covering the first current-carrying line and a second shielded conductor structure covering the second current-carrying line; the first shielded conductor structure is used to collect leakage signals of the first current-carrying line, and the second shielded conductor structure is used to collect leakage signals of the second current-carrying line; the first shielded conductor structure comprises a first end close to the input end of the power line, a second end close to the output end of the power line, and a third end between the first end and the second end; the second shielded conductor structure comprises a fourth end close to the input end, a fifth end close to the output end, and a sixth end between the fourth end and the fifth end; the third end is connected to the sixth end; an open circuit detection module, connected to the first end, the second end, the fourth end and the fifth end respectively, the open circuit detection module being configured to generate an open circuit signal when at least a portion of the first shielding conductor structure and / or the second shielding conductor structure is open circuit; A trigger module is coupled to the leakage detection module, the open circuit detection module and the switch module, and is configured to receive the leakage signal and / or the open circuit signal, and drive the switch module to disconnect the power connection in response to the leakage signal and / or the open circuit signal.

2. The detection and protection device according to claim 1, characterized in that: The trigger module includes a voltage stabilizing unit and a third switch unit that drives the switch module to disconnect the power connection when turned on, and the control pin of the third switch unit is connected to the open circuit detection module to obtain the open circuit signal; the negative electrode of the voltage stabilizing unit is connected to the first shielding conductor structure and / or the second shielding conductor structure to obtain the leakage signal in the first shielding conductor structure and / or the second shielding conductor structure, and the positive electrode is connected to the control pin of the third switch unit.

3. The detection and protection device according to claim 2, characterized in that: The negative electrode of the voltage stabilizing unit is connected to any one of the following: the first end; the second end; the third end; the fourth end; the fifth end; The sixth end.

4. The detection and protection device according to claim 1, characterized in that: The open circuit detection module includes a first switch unit and a second switch unit; One end of the first switch unit is connected to the first current-carrying line or the second current-carrying line, and the other end is connected to the trigger module, the open circuit detection module further includes a first bias unit for providing a switch-on signal to the first switch unit, one end of the first bias unit is connected to the first end, and the other end is connected to the fourth end; One end of the second switch unit is connected to the first current-carrying line or the second current-carrying line, and the other end is connected to the trigger module. The open circuit detection module also includes a second bias unit for providing a conduction switching signal to the second switch unit, one end of the second bias unit is connected to the second end, and the other end is connected to the fifth end.

5. The detection and protection device according to claim 4, characterized in that: The first bias unit is configured to: when any part of the first shielded conductor structure and the second shielded conductor structure between the first end and the fourth end is open-circuited, provide a switch-on signal to the first switch unit to turn on the first switch unit, so that the first switch unit sends an open-circuit signal to the trigger module; the second bias unit is configured to: when any part of the first shielded conductor structure and the second shielded conductor structure between the second end and the fifth end is open-circuited, provide a switch-on signal to the second switch unit to turn on the second switch unit, so that the second switch unit sends an open-circuit signal to the trigger module.

6. The detection and protection device according to claim 5, characterized in that: The first switch unit includes a first transistor, the first bias unit includes a first resistor, and the open circuit detection module also includes a second resistor and a third resistor, one end of the first resistor is connected to the first end, the emitter of the first transistor and one end of the second resistor, the other end of the second resistor is connected to one of the first current-carrying line and the second current-carrying line, the other end of the first resistor is connected to the fourth end, the base of the first transistor and one end of the third resistor, the other end of the third resistor is connected to the other of the first current-carrying line and the second current-carrying line, and the collector of the first transistor is connected to the trigger module.

7. The detection and protection device according to claim 5, characterized in that: The second switch unit includes a second transistor, the second bias unit includes a fourth resistor, and the open circuit detection module also includes a fifth resistor and a sixth resistor, one end of the fourth resistor is connected to the second end, the emitter of the second transistor and one end of the fifth resistor, the other end of the fifth resistor is connected to one of the first current-carrying line and the second current-carrying line, the other end of the fourth resistor is connected to the fifth end, the base of the second transistor and one end of the sixth resistor, the other end of the sixth resistor is connected to the other of the first current-carrying line and the second current-carrying line, and the collector of the second transistor is connected to the trigger module.

8. The detection and protection device according to claim 1, characterized in that: The open circuit detection module includes a first switch unit and a second switch unit; One end of the first switch unit is connected to the first current-carrying line or the second current-carrying line, and the other end is connected to the trigger module, the open circuit detection module further includes a first bias unit for providing a switch-on signal to the first switch unit, one end of the first bias unit is connected to the first end, and the other end is connected to the fifth end; One end of the second switch unit is connected to the first current-carrying line or the second current-carrying line, and the other end is connected to the trigger module. The open circuit detection module also includes a second bias unit for providing a conduction switching signal for the second switch unit, one end of the second bias unit is connected to the second end, and the other end is connected to the fourth end.

9. The detection and protection device according to claim 2, characterized in that: The trigger module further includes a trip coil for generating an electromagnetic force to drive the switch module to disconnect the power connection, and the trip coil and the third switch unit are connected in series between the first current-carrying line and the second current-carrying line.

10. The detection and protection device according to claim 9, characterized in that: The third switch unit includes a thyristor, and the trigger module also includes a seventh resistor. The control electrode of the thyristor is respectively connected to one end of the seventh resistor, the positive electrode of the voltage stabilizing unit and the open circuit detection module, the other end of the seventh resistor and the cathode of the thyristor are connected to the first current-carrying line, and the anode of the thyristor is connected to the second current-carrying line through the tripping coil.

11. The detection and protection device according to claim 10, characterized in that: The trigger module also includes a first capacitor connected in parallel with the seventh resistor.

12. The detection and protection device according to claim 10, characterized in that: The trigger module also includes a first diode and a second diode, the other end of the seventh resistor and the cathode of the thyristor are connected to the anode of the first diode and the anode of the second diode, the cathode of the first diode is connected to the first current-carrying line, and the cathode of the second diode is connected to the connection point between the thyristor and the tripping coil.

13. The detection and protection device according to claim 1 or 2, characterized in that: It also includes a leakage simulation module, which includes a first test switch, one end of which is connected to the first current-carrying line or the second current-carrying line, and the other end of which is connected to the first shielding conductor structure and / or the second shielding conductor structure.

14. The detection and protection device according to claim 13, characterized in that: The leakage simulation module also includes an eighth resistor and a ninth resistor, the other end of the first test switch is respectively connected to one end of the eighth resistor and one end of the ninth resistor, and the other end of the eighth resistor and the other end of the ninth resistor are respectively connected to two of the first end, the second end, the third end, the fourth end, the fifth end and the sixth end.

15. The detection and protection device according to claim 2, characterized in that: It also includes a second test switch, one end of which is connected to the first current-carrying line or the second current-carrying line, and the other end of which is connected to the control pin of the third switch unit.

16. The detection and protection device according to claim 2, characterized in that: It also includes a leakage simulation module, which includes a third test switch and a fourteenth resistor, one end of the third test switch is connected to the first current-carrying line or the second current-carrying line, and the other end is connected to the first shielding conductor structure and / or the second shielding conductor structure through the fourteenth resistor, and the fourteenth resistor is configured to: when the third test switch is pressed and the open circuit detection module fails, adjust the potential of the negative electrode of the voltage stabilizing unit to prevent the voltage stabilizing unit from being broken down.

17. The detection and protection device according to claim 2, characterized in that: The trigger module also includes a tenth resistor and an eleventh resistor, the negative electrode of the voltage stabilizing unit is connected to the first shielding conductor structure and / or the second shielding conductor structure through the eleventh resistor, and the open circuit detection module is connected to the negative electrode of the voltage stabilizing unit through the tenth resistor, so that the third switch unit obtains the open circuit signal through the tenth resistor.

18. The detection and protection device according to claim 5, characterized in that: The first switch unit includes a first transistor, and the first bias unit includes a first resistor and a twelfth resistor; The second switch unit includes a second triode, and the second bias unit includes a fourth resistor and a thirteenth resistor; The open circuit detection module also includes a second resistor, a third resistor, a fifth resistor and a sixth resistor; The emitter of the first transistor is connected to one end of the first resistor, the first end and one end of the second resistor, the base of the first transistor is connected to the other end of the first resistor and one end of the twelfth resistor, and the other end of the twelfth resistor is connected to the fourth end and one end of the third resistor; The emitter of the second transistor is connected to one end of the fourth resistor, the second end and one end of the fifth resistor, the base of the second transistor is connected to the other end of the fourth resistor and one end of the thirteenth resistor, and the other end of the thirteenth resistor is connected to the fifth end and one end of the sixth resistor; The other end of the second resistor is connected together with the other end of the fifth resistor and connected to one of the first current-carrying line and the second current-carrying line, the other end of the third resistor is connected together with the other end of the sixth resistor and connected to the other of the first current-carrying line and the second current-carrying line, and the collector of the first transistor is connected together with the collector of the second transistor and connected to the trigger module.

19. The detection and protection device according to claim 18, characterized in that: The trigger module includes a voltage stabilizing unit and a third switch unit that drives the switch module to disconnect the power connection when turned on, and the control pin of the third switch unit is connected to the collector of the first transistor and the collector of the second transistor to obtain the open circuit signal; the negative electrode of the voltage stabilizing unit is connected to the first shielding conductor structure and / or the second shielding conductor structure to obtain the leakage signal in the first shielding conductor structure and / or the second shielding conductor structure, and the positive electrode of the voltage stabilizing unit is connected to the control pin of the third switch unit.

20. The detection and protection device according to claim 19, characterized in that: It also includes a leakage simulation module, which includes a third test switch, one end of the third test switch is connected to the connection point between the second resistor and the fifth resistor, and the other end of the third test switch is connected to the first shielding conductor structure and / or the second shielding conductor structure.

21. The detection and protection device according to claim 20, characterized in that: The leakage simulation module also includes a fourteenth resistor, the other end of the third test switch is connected to one end of the fourteenth resistor, and the other end of the fourteenth resistor is connected to the third end; the negative electrode of the voltage stabilizing unit is connected to the sixth end; the fourteenth resistor is configured to: when the third test switch is pressed and the open circuit detection module fails, adjust the potential of the negative electrode of the voltage stabilizing unit to prevent the voltage stabilizing unit from being broken down.

22. The detection and protection device according to claim 1, characterized in that: Also includes leakage simulation module; The open circuit detection module includes a first triode, a first voltage dividing unit, a second triode and a second voltage dividing unit; The first voltage dividing unit comprises a second resistor, a first resistor, a twelfth resistor and a third resistor connected in series in sequence, wherein a connection point between the second resistor and the first resistor is connected to the first end and the emitter of the first transistor; a connection point between the first resistor and the twelfth resistor is connected to the base of the first transistor; and a connection point between the twelfth resistor and the third resistor is connected to the fourth end; The second voltage dividing unit comprises a fifth resistor, a fourth resistor, a thirteenth resistor and a sixth resistor connected in series in sequence; a connection point between the fifth resistor and the fourth resistor is connected to the second end and the emitter of the second triode; a connection point between the fourth resistor and the thirteenth resistor is connected to the base of the second triode; a connection point between the thirteenth resistor and the sixth resistor is connected to the fifth end; The second resistor and the fifth resistor are connected together and connected to the second current-carrying line, and the third resistor and the sixth resistor are connected together and connected to the first current-carrying line; The trigger module includes a voltage stabilizing unit and a third switch unit that drives the switch module to disconnect the power connection when turned on; the control pin of the third switch unit is connected to the collector of the first transistor and the collector of the second transistor to obtain the open circuit signal; the positive electrode of the voltage stabilizing unit is connected to the control pin of the third switch unit, and the negative electrode is connected to the sixth end to obtain the leakage signal; The leakage simulation module includes a third test switch and a fourteenth resistor; one end of the third test switch is connected to a connection point between the second resistor and the fifth resistor, the other end of the third test switch is connected to one end of the fourteenth resistor, and the other end of the fourteenth resistor is connected to the third end.

23. An electrical connection device, characterized in that: It comprises the detection and protection device according to any one of claims 1 to 22, a shell and the power cord, the power cord is connected to the shell, and the switch module, the open circuit detection module and the trigger module are arranged in the shell.

24. An electrical equipment, characterized in that: The device comprises a load device and the electrical connection device according to claim 23, wherein the output end of the power line is connected to the load device.

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