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; the third end is connected with the sixth end; the open circuit detection module is connected with the first end, the second end, the fourth end and the fifth end; the trigger module comprises a third switch unit and a fourth switch unit. 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 the use safety. 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 of the 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 to process the connection of the power cord's leakage current detection line. The way of constructing the detection path is relatively limited, and the flexibility and safety of the detection are insufficient. Summary of the Invention

[0004] An object of the present invention is to solve at least one of the technical problems existing in the prior art, and to 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. The power cord includes a first current-carrying line and a second current-carrying line. The detection and protection device includes: a switch module, a leakage detection module, an open circuit detection module, and a trigger module, where:

[0006] The switch module is used to control 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 close to the input end of the power supply line, a second end close to the output end of the power supply line, and a third end located between the first end and the second end; the second shielding conductor structure includes 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; 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 includes a third switch unit connected to the open-circuit detection module and a fourth switch unit connected to the first shielding conductor structure and / or the second shielding conductor structure. The fourth switch unit is connected to the third switch unit and transmits the leakage signal to the third switch unit when conducting. The third switch unit is configured to receive the leakage signal and / or the open-circuit signal, and in response to the leakage signal and / or the open-circuit signal, drive the switch module to disconnect the power connection.

[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 third switch unit in the trigger module can receive the open-circuit signal by being directly connected to the open-circuit detection module, and the third switch unit is also indirectly connected through the fourth switch unit so as to receive the leakage signal when the fourth switch unit is turned on. The third switch unit 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, so as 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 can 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, which is 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 fourth switch unit includes a third triode, and a fourteenth resistor and a fifteenth resistor connected in series between the first current-carrying line and the second current-carrying line. The connection point of the fourteenth resistor and the fifteenth resistor is connected to the base of the third triode. The emitter of the third triode is connected to the first shielding conductor structure and / or the second shielding conductor structure. The collector of the third triode is connected to the third switch unit.

[0012] According to the detection and protection device provided by some embodiments of the present invention, the fourth switch unit further includes a third diode, the emitter of the third triode is connected to the cathode of the third diode, and the anode of the third diode 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] According to the detection and protection device provided by some embodiments of the present invention, 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 third switch unit. The open-circuit detection module further includes a first bias unit for providing a switch conduction 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;

[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 third switch unit. The open-circuit detection module further includes a second bias unit for providing a conduction 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.

[0022] According to the detection and protection device provided by some embodiments of the present invention, the first bias unit is configured to: when any part of the first shield conductor structure and the second shield conductor structure between the first end and the fourth end is open-circuited, provide a switch conduction signal to the first switch unit to make the first switch unit conduct, so that the first switch unit sends an open-circuit signal to the third switch unit; the second bias unit is configured to: when any part of the first shield conductor structure and the second shield conductor structure between the second end and the fifth end is open-circuited, provide a switch conduction signal to the second switch unit to make the second switch unit conduct, so that the second switch unit sends an open-circuit signal to the third switch unit.

[0023] According to the detection and protection device provided by some embodiments of the present invention, the first switch unit includes a first triode, the first biasing unit includes a first resistor, and 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. The collector of the first triode is connected to the third switch unit.

[0024] According to the detection and protection device provided by some embodiments of the present invention, the second switch unit includes a second triode, the second biasing unit includes a fourth resistor, and 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. The collector of the second triode is connected to the third switch unit.

[0025] According to the detection and protection device provided by 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 third switch unit. 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 third switch unit. 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] According to the detection and protection device provided by some embodiments of the present invention, the trigger module further includes a trip coil for generating an electromagnetic force to drive the switch module to disconnect the power connection. The trip 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 collector of the third triode, 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 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.

[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. 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.

[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 sixteenth 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 sixteenth resistor. The sixteenth resistor is configured to: when the third test switch is pressed and the open-circuit detection module fails, adjust the potential of the emitter of the third triode so that the third triode is not turned on.

[0036] 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 seventeenth resistor; the second switch unit includes a second triode, and the second biasing unit includes a fourth resistor and an eighteenth 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 seventeenth resistor, and the other end of the seventeenth 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 eighteenth resistor, and the other end of the eighteenth 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 third switch unit.

[0037] For the detection and protection device provided according to some embodiments of the present invention, the fourth switch unit includes a third triode, and a fourteenth resistor and a fifteenth resistor connected in series between the first current-carrying line and the second current-carrying line. The connection point of the fourteenth resistor and the fifteenth resistor is connected to the base of the third triode. The emitter of the third triode is connected to the first shielding conductor structure and / or the second shielding conductor structure, and the collector of the third triode is connected to the third switch unit.

[0038] 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 the 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.

[0039] For the detection and protection device provided according to some embodiments of the present invention, the leakage simulation module further includes a sixteenth resistor. The other end of the third test switch is connected to one end of the sixteenth resistor, and the other end of the sixteenth resistor is connected to the third terminal; the emitter of the third triode is connected to the sixth terminal; the sixteenth resistor is configured to: when the third test switch is pressed and the open - circuit detection module fails, adjust the potential of the emitter of the third triode so that the third triode does not conduct.

[0040] The detection and protection device provided according to some embodiments of the present invention further includes a leakage simulation module;

[0041] The open - circuit detection module includes a first triode, a second triode, a first voltage - dividing unit, and a second voltage - dividing unit; the first voltage - dividing unit includes a second resistor, a first resistor, a seventeenth resistor, and a third resistor connected in series in sequence, and the second voltage - dividing unit includes a fifth resistor, a fourth resistor, an eighteenth resistor, and a sixth resistor connected in series in sequence; the connection point of the second resistor and the first resistor is connected to the first terminal and the emitter of the first triode; the connection point of the first resistor and the seventeenth resistor is connected to the base of the first triode; the connection point of the seventeenth resistor and the third resistor is connected to the fourth terminal; the connection point of the fifth resistor and the fourth resistor is connected to the second terminal and the emitter of the second triode; the connection point of the fourth resistor and the eighteenth resistor is connected to the base of the second triode; the connection point of the eighteenth 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;

[0042] The fourth switch unit includes a third triode, and a fourteenth resistor and a fifteenth resistor connected in series between the first current - carrying line and the second current - carrying line. The connection point of the fourteenth resistor and the fifteenth resistor is connected to the base of the third triode. The emitter of the third triode is connected to the sixth terminal, and the collector of the third triode is connected to the third switch unit;

[0043] The leakage simulation module includes a third test switch and a sixteenth 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 sixteenth resistor, and the other end of the sixteenth resistor is connected to the third terminal.

[0044] 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 switch module, the open-circuit detection module, and the trigger module are arranged in the housing.

[0045] 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.

[0046] Other features and advantages of the present invention will be described in the following description, and, in part, 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 by the structures specifically pointed out in the description, the claims, and the drawings. Description of the Drawings

[0047] The drawings are used to provide a further understanding of the technical solutions of the present invention, and constitute a part of the description. They are used together with the embodiments of the present invention to explain the technical solutions of the present invention, and do not constitute a limitation to the technical solutions of the present invention.

[0048] The present invention will be further described below in conjunction with the drawings and embodiments;

[0049] Figure 1 is a module principle block diagram of the detection and protection device provided by the embodiment of the present invention;

[0050] Figure 2 is a circuit schematic diagram of the detection and protection device provided by Embodiment 1 of the present invention;

[0051] Figure 3 is a circuit schematic diagram of the detection and protection device provided by Embodiment 2 of the present invention;

[0052] Figure 4 is a circuit schematic diagram of the detection and protection device provided by Embodiment 3 of the present invention;

[0053] Figure 5 is a circuit schematic diagram of the detection and protection device provided by Embodiment 4 of the present invention;

[0054] Figure 6 is a circuit schematic diagram of the detection and protection device provided by Embodiment 5 of the present invention;

[0055] Figure 7 It is a 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;

[0056] Figure 8 It is a 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;

[0057] Figure 9 It is a 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;

[0058] Figure 10 It is a 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;

[0059] Figure 11 It is a 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;

[0060] Figure 12 It is a circuit schematic diagram of the detection and protection device provided in the sixth embodiment of the present invention;

[0061] Figure 13 It is a circuit schematic diagram of the detection and protection device provided in the seventh embodiment of the present invention;

[0062] Figure 14 It is a schematic diagram of the structure of the electrical connection device provided in the embodiment of the present invention. Detailed implementation manners

[0063] This part 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 function of the accompanying drawings is to supplement the description of 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, but it should not be construed as a limitation on the protection scope of the present invention.

[0064] In the description of the embodiments of the present invention, the meaning of "several" is one or more, the meaning of "multiple" is more than two, and understandings such as "greater than", "less than", "exceeding", etc. do not include the present number, understandings such as "above", "below", "within", etc. include the present number, "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 items 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.

[0065] 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, and those skilled in the art can reasonably determine the specific meanings 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 can communicate with each other; it can be directly connected or indirectly connected through an intermediate medium.

[0066] 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.

[0067] 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 the 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. At present, 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 for the leakage current detection line of the power line, or a return line is connected in series with the leakage current detection line, or multiple leakage current detection lines are connected in parallel for connection processing. The way of constructing the detection path is relatively limited, and the flexibility and safety of detection are insufficient.

[0068] Based on this, the embodiments of the present invention provide a detection and protection device for a power line, 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 line, and is beneficial to improving the power supply safety of the power line.

[0069] The following further elaborates on the embodiments of the present invention in conjunction with the accompanying drawings.

[0070] Figure 1It is the block diagram of the module of the detection and protection device provided by the embodiment of the present invention; Figure 2 It is the circuit schematic diagram of the detection and protection device provided by the embodiment of the present invention. Refer to Figure 1 and Figure 2 In the first aspect embodiment of the present invention, a detection and protection device for a power line is provided, wherein: the power line includes a first current-carrying line 110 and a second current-carrying line 120.

[0071] It can be understood that when the power line supplies power to an electrical device 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 line supplies power to an electrical device 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 will be taken as an example for description, and the same applies to the other situations.

[0072] 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:

[0073] The switch module 210 is used to control the electrical connection between the input end and the output end of the power line; Refer 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 line 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 line is disconnected.

[0074] 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 line, a second end b near the output end of the power 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 covers 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 covers 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 with 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.

[0075] 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.

[0076] The trigger module 240. The trigger module includes a third switch unit 241 connected to the open-circuit detection module 230, and a fourth switch unit 242 connected to the first shielding conductor structure and / or the second shielding conductor structure. The fourth switch unit 242 is connected to the third switch unit 241 and transmits a leakage signal to the third switch unit 241 when conducting. The third switch unit 241 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.

[0077] In the detection and protection device for a power line provided by an embodiment of the present invention, the third switch unit 241 in the trigger module can receive an open-circuit signal by being directly connected to the open-circuit detection module 230. The third switch unit 241 is also indirectly connected through the fourth switch unit 242, so that it can receive a leakage signal when the fourth switch unit 242 conducts. The third switch unit 241 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, 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 and the second shielding conductor structure form a plurality of detection segments that can be combined, so as to be able to construct a shielding network with a variety of different detection paths, greatly enriching the feasibility and flexibility of the power line for leakage detection and open-circuit detection of the shielding structure, which is beneficial to improving the power supply safety of the power line.

[0078] Refer to Figure 2 , in the detection and protection device provided by some embodiments of the present invention, the fourth switch unit 242 includes a third triode Q3, and a fourteenth resistor R14 and a fifteenth resistor R15 connected in series between the first current-carrying line 110 and the second current-carrying line 120. The connection point of the fourteenth resistor R14 and the fifteenth resistor R15 is connected to the base of the third triode Q3. The emitter of the third triode Q3 is connected to the first shielding conductor structure and / or the second shielding conductor structure. The collector of the third triode Q3 is connected to the third switch unit 241. It should be noted that the collector of the third triode Q3 can be directly connected to the third switch unit 241, or indirectly connected to the third switch unit 241. For example, as shown in Figure 2 , the fourth switch unit 242 further includes an eleventh resistor R11, and the collector of the third triode Q3 is connected to the third switch unit 241 via the eleventh resistor R11.

[0079] In this embodiment, the fourteenth resistor R14 and the fifteenth resistor R15 are connected in series between the first current-carrying line 110 and the second current-carrying line 120, and a divided voltage is provided to the base of the third triode Q3 through the connection point of the fourteenth resistor R14 and the fifteenth resistor R15. When the voltage of the leakage signal received by the emitter of the third triode Q3 is greater than the divided voltage of the base, the emitter junction of the third triode Q3 is forward-biased and conducts, and then the leakage signal is transmitted to the third switch unit 241 through the collector of the third triode Q3.

[0080] 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 connection conductor between the first shielding conductor structure 221, the second shielding conductor structure 222, and the third end c and the sixth end f, the emitter of the third triode Q3 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 emitter of the third triode Q3.

[0081] In the detection and protection device provided in some embodiments of the present invention, the fourth switch unit 242 further includes a third diode D3. The emitter of the third triode Q3 is connected to the cathode of the third diode D3, and the anode of the third diode D3 is connected to any one of the following: the first end a; the second end b; the third end c; the fourth end d; the fifth end e; the sixth end f.

[0082] It can be understood that by setting the third diode D3 between the emitter of the third triode Q3 and the leakage detection module 220, the leakage signal detected on the leakage detection module 220 can flow unidirectionally to the emitter of the third triode Q3.

[0083] In addition, the first end a, the second end b, and the third end c are the connection points already led out on the first shielding conductor structure 221, and the fourth end d, the fifth end e, and the sixth end f are the connection points already led out on the second shielding conductor structure 222. Therefore, connecting the anode of the third diode D3 to any one of the above six ends has the advantage of convenient wiring.

[0084] Referring to Figure 2 , in the detection and protection device provided in some embodiments of the present invention, the open-circuit detection module 230 includes a first switch unit 231 and a second switch unit 232;

[0085] 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 third switch unit 241. The open-circuit detection module 230 further includes a first bias unit for providing a switch conduction signal to the first switch unit 231. One end of the first bias unit is connected to the first end a, and the other end is connected to the fourth end d;

[0086] 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 third switch unit 241. The open-circuit detection module 230 further includes a second bias unit for providing a conduction 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.

[0087] 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 first bias unit cannot provide a switch conduction signal 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 second bias unit cannot provide a switch conduction signal to the second switch unit 232.

[0088] 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 conduction signal to the first switch unit 231 to make the first switch unit 231 conduct, so that the first switch unit 231 sends an open-circuit signal to the third switch unit 241; 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 conduction signal to the second switch unit 232 to make the second switch unit 232 conduct, so that the second switch unit 232 sends an open-circuit signal to the third switch unit 241.

[0089] 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 third switch unit 241 in 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 third switch unit 241 in 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, both the first end a and the fourth end d and the second end b and the fifth end e will no longer be short-circuited, 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 at the same time, and then the first switch unit 231 and the second switch unit 232 send open-circuit signals to the third switch unit 241 in the trigger module 240 at the same time.

[0090] 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 third switch unit 241. 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 toFigure 2 As 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.

[0091] In this embodiment, both ends of the first resistor R1 are respectively connected to the first terminal a and the fourth terminal 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 terminal a and the third terminal c is open, or when the part of the second shielding conductor structure 222 between the sixth terminal f and the fourth terminal d is open, or when the connecting conductor between the third terminal c and the sixth terminal f is disconnected, the two ends of the first resistor R1 will no longer be short-circuited and can undertake voltage division, so as to provide a bias voltage to the emitter junction of the first triode Q1 to make the first triode Q1 conduct.

[0092] 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, the second resistor R2 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 tripping coil Lx. It can be understood that in some other embodiments, the 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, the 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, the 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.

[0093] Referring 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 third switch unit 241. 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.

[0094] 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 biasing 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-circuited, or when a part of the second shielding conductor structure 222 between the sixth terminal f and the fifth terminal e is open-circuited, 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 can undertake voltage division, so as to provide a biasing voltage to the emitter junction of the second triode Q2 to make the second triode Q2 conduct.

[0095] It should be noted that Figure 2The trigger module 240 shown further includes a tripping 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 tripping 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 tripping 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.

[0096] In addition, it can also be understood that in Figure 2 the embodiments, 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 tripping 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 tripping 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.

[0097] In another embodiment different from the embodiment shown in the present invention and Figure 2 the embodiment shown, the open-circuit detection module 230 includes a first switch unit 231 and a second switch unit 232; the trigger module 240 includes a tripping coil Lx and a first diode D1;

[0098] 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 third switch unit 241. 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 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 third switch unit 241 in 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;

[0099] 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 third switch unit 241. 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 third switch unit 241 in 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.

[0100] 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 being that in

[0101] In the detection and protection device provided by some embodiments of the present invention, the trigger module 240 further includes a tripping coil Lx for generating an electromagnetic force to drive the switch module 210 to disconnect the power connection. The tripping 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 Q4. The trigger module 240 further includes a seventh resistor R7. The control electrode of the thyristor Q4 is respectively connected to one end of the seventh resistor R7, the collector of the third triode Q3, and the open-circuit detection module 230. The other end of the seventh resistor R7 and the cathode of the thyristor Q4 are connected to the first current-carrying line 110, and the anode of the thyristor Q4 is connected to the second current-carrying line 120 through the tripping coil Lx.

[0102] It should be noted that the control electrode of the thyristor Q4 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 electrode of the thyristor Q4 is indirectly connected to the open-circuit detection module 230 through the tenth resistor R10.

[0103] It should also 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 Q4, a voltage can be generated across the seventh resistor R7 and provided to the base and cathode of the thyristor Q4, that is, a switch-on signal is provided to the thyristor Q4, causing the thyristor Q4 to conduct, and then causing the tripping 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 cord.

[0104] Referring to Figure 2 , in the detection and protection device provided by some embodiments of the present invention, the trigger module 240 further includes a first capacitor C1 connected in parallel with the seventh resistor R7.

[0105] 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 Q4, the thyristor Q4 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 Q4, and triggering the thyristor Q4 to conduct when the negative half-cycle of the AC power supply arrives.

[0106] Referring to Figure 2, in the detection and protection device provided by 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 Q4 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 between the thyristor Q4 and the tripping coil Lx.

[0107] Referring 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.

[0108] 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.

[0109] It can also be understood that in the Figure 2 embodiment, 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 the tripping 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.

[0110] 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.

[0111] 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 further includes an eighth resistor R8 and a ninth resistor R9. 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.

[0112] It can be understood that when the first test switch TEST1 is pressed, the leakage signal of the second current-carrying line 120 can be simulated and transmitted to two positions in the first shielding conductor structure 221 and the second shielding conductor structure 222, so that the leakage detection function of the detection protection device can be tested to see if it is in good condition.

[0113] Similarly, in Figure 4 the embodiment shown, one end of the first test switch TEST1 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.

[0114] Referring to Figure 5 , according to the detection protection device provided by some embodiments of the present invention, it further includes a second test switch TEST2. One end of the second test switch TEST2 is connected to the first current-carrying line 110 or 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 Q4.

[0115] When the second test switch TEST2 is pressed, the second current-carrying line 120 directly provides a conduction control signal to the control electrode of the thyristor Q4, simulating that the trigger module 240 receives a leakage signal or an open-circuit signal, so that the normal operation of the trigger module 240 and the switch module 210 can be tested.

[0116] Referring to Figure 6 , in the detection 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 third test switch TEST3 and a sixteenth resistor R16. One end of the third test switch TEST3 is connected to the first current-carrying line 110 or 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 sixteenth resistor R16. The sixteenth resistor R16 is configured to: when the third test switch TEST3 is pressed and the open-circuit detection module 230 fails, adjust the potential of the emitter of the third triode Q3 so that the third triode Q3 does not conduct.

[0117] In this embodiment, for the third triode Q3, its collector is connected to the control electrode of the thyristor Q4 through the eleventh resistor R11, its base is connected to the connection point of the fourteenth resistor R14 and the fifteenth resistor R15, and its emitter 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 third diode D3. 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 potential is lower than the potential of the connection point of the fourteenth resistor R14 and the fifteenth resistor R15, and the third triode Q3 will not be turned on. When the third test switch TEST3 is pressed, it is equivalent to the parallel connection of the sixteenth resistor R16 with the second resistor R2 and the fifth resistor R5, making the first equivalent resistance smaller, resulting in the potential of the first shielding conductor structure 221 and the second shielding conductor structure 222 rising to be greater than the potential of the connection point of the fourteenth resistor R14 and the fifteenth resistor R15. As a result, the third triode Q3 will be turned on, thereby increasing the voltage of the control electrode of the thyristor Q4. 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 Q4 is turned on, forming a strong current path of the second current-carrying line 120 - the tripping coil Lx - the thyristor Q4 - the first diode D1 - the first current-carrying line 110; 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. When an open circuit fault occurs in the second resistor R2 or the fifth resistor R5 in the open circuit detection module 230, the first equivalent resistance will become larger, and the potential of the first shielding conductor structure 221 and the second shielding conductor structure 222 will drop. At this time, when the third test switch TEST3 is pressed again, although the potential of the first shielding conductor structure 221 and the second shielding conductor structure 222 will rise, by reasonably configuring the resistance value of the sixteenth resistor R16, 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 turn on the third triode Q3. Therefore, when a fault occurs in the open circuit detection module 230 and the user presses the third test switch TEST3 for testing, the third triode Q3 is not turned on, and the tripping coil Lx will not drive the switch module 210 to disconnect the power connection. At this time, the user can determine that the detection and protection device is abnormal.

[0118] 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.

[0119] Additionally, 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 Q4. 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 Q4 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. The negative electrode of the first diode D1 is connected to the first current-carrying line 110.

[0120] Furthermore, 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 Q4. 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 withstands overvoltage and absorbing excess current to protect sensitive devices.

[0121] 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:

[0122] 1. When the leakage signal of the first current-carrying line 110 is transmitted to the first shielding conductor structure 221:

[0123] After the first shielding conductor structure 221 obtains the leakage signal, the third triode Q3 conducts, forming a conduction path of the first current-carrying line 110 - the first shielding conductor structure 221 - the third diode D3 - the third triode Q3 - the eleventh resistor R11 - the seventh resistor R7 - the second diode D2 - the tripping coil Lx - the second current-carrying line 120;

[0124] The voltage of the control electrode of thyristor Q4 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 Q4 conducts, forming a strong current path of the second current-carrying line 120 - trip coil Lx - thyristor Q4 - first diode D1 - first current-carrying line 110;

[0125] 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.

[0126] 2. When the leakage signal of the second current-carrying line 120 is transmitted to the second shielding conductor structure 222:

[0127] After the second shielding conductor structure 222 obtains this leakage signal, the third triode Q3 conducts, forming a conduction path of the second current-carrying line 120 - second shielding conductor structure 222 - third diode D3 - third triode Q3 - eleventh resistor R11 - seventh resistor R7 - first diode D1 - first current-carrying line 110;

[0128] The voltage of the control electrode of thyristor Q4 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 Q4 conducts, forming a strong current path of the second current-carrying line 120 - trip coil Lx - thyristor Q4 - first diode D1 - first current-carrying line 110;

[0129] 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.

[0130] 3. When the part of the first shielding conductor structure 221 between the first end a and the third end c is open:

[0131] 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;

[0132] 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;

[0133] 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;

[0134] The voltage at the control electrode of the thyristor Q4 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 Q4 conducts, forming a strong current path of the second current-carrying line 120 - trip coil Lx - thyristor Q4 - first diode D1 - first current-carrying line 110;

[0135] 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.

[0136] 4. When a part of the first shielding conductor structure 221 between the second end b and the third end c is open:

[0137] 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 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 first end a - third end c - sixth end f - fifth end e also exists simultaneously;

[0138] 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;

[0139] 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;

[0140] The voltage at the control electrode of the thyristor Q4 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 Q4 conducts, forming a strong current path of the second current-carrying line 120 - trip coil Lx - thyristor Q4 - first diode D1 - first current-carrying line 110;

[0141] 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.

[0142] 5. When the connecting conductor between the third end c and the sixth end f is open:

[0143] 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;

[0144] 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;

[0145] The first triode Q1 and the second triode Q2 are both 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;

[0146] The voltage of the control electrode of the thyristor Q4 rises. 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 Q4 is turned on, and a strong current path of the second current - carrying line 120 - trip coil Lx - thyristor Q4 - first diode D1 - first current - carrying line 110 is formed;

[0147] The trip coil Lx generates a strong electromagnetic force, thereby driving the switch module 210 to disconnect the electrical connection between the input end and the output end of the power line.

[0148] 6. When the part of the second shielding conductor structure 222 between the fourth terminal d and the sixth terminal f is open - circuited:

[0149] 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;

[0150] 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;

[0151] The first triode Q1 is turned on, while the second triode Q2 remains off; a conduction path is formed: 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.

[0152] The voltage at the control electrode of the thyristor Q4 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 Q4 is turned on, forming a strong current path: the second current-carrying line 120 - the trip coil Lx - the thyristor Q4 - the first diode D1 - the first current-carrying line 110.

[0153] 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.

[0154] 7. When a part of the second shielding conductor structure 222 between the fifth end e and the sixth end f is open:

[0155] 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: the first end a - the third end c - the sixth end f - the fourth end d; it should be noted that the conduction path: the second end b - the third end c - the sixth end f - the fourth end d also exists simultaneously.

[0156] A conduction path is formed: 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.

[0157] The second triode Q2 is turned on, while the first triode Q1 remains off; a conduction path is formed: 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.

[0158] The voltage at the control electrode of the thyristor Q4 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 Q4 is turned on, forming a strong current path: the second current-carrying line 120 - the trip coil Lx - the thyristor Q4 - the first diode D1 - the first current-carrying line 110.

[0159] 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.

[0160] 8. When the first test switch TEST1 is pressed:

[0161] The first test switch TEST1 simulates the leakage signal transfer of the second current-carrying line 120 to the first shielding conductor structure 221 or the second shielding conductor structure 222;

[0162] After the first shielding conductor structure 221 or the second shielding conductor structure 222 obtains the leakage signal, the third triode Q3 conducts, 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 - third diode D3 - third triode Q3 - eleventh resistor R11 - seventh resistor R7 - first diode D1 - first current-carrying line 110;

[0163] The voltage of the control electrode of the thyristor Q4 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 Q4 conducts, forming a strong current path of the second current-carrying line 120 - trip coil Lx - thyristor Q4 - first diode D1 - first current-carrying line 110;

[0164] 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.

[0165] Refer to Figure 12 , in the detection and protection device provided by some embodiments of the present invention, compared with the detection and protection device shown in Figure 6 , it has the same switch module 210, leakage detection module 220, leakage simulation module 250, LED indication unit 260 and lightning protection unit 270, and makes changes to the open-circuit detection module 230 and trigger module 240 in the detection and protection device shown in Figure 6 , specifically:

[0166] The first switch unit 231 includes a first triode Q1, and the first biasing unit includes a first resistor R1 and a seventeenth resistor R17; the second switch unit 232 includes a second triode Q2, and the second biasing unit includes a fourth resistor R4 and an eighteenth resistor R18;

[0167] The open-circuit detection module 230 further includes a second resistor R2, a third resistor R3, a fifth resistor R5 and a sixth resistor R6;

[0168] The emitter of the first triode Q1 is connected to one end of the first resistor R1, the first end 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 seventeenth resistor R17. The other end of the seventeenth resistor R17 is connected to the fourth end d and one end of the third resistor R3;

[0169] 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 eighteenth resistor R18. The other end of the eighteenth resistor R18 is connected to the fifth terminal e and one end of the sixth resistor R6.

[0170] 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 third switching unit 241.

[0171] Similarly, in this embodiment, since the two ends of the first bias unit, the first resistor R1 and the seventeenth resistor R17, 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, the two ends of the first bias unit are short-circuited, and a switching conduction signal cannot be provided for the first triode Q1. Similarly, since the two ends of the second bias unit, the fourth resistor R4 and the eighteenth resistor R18, 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, the two ends of the second bias unit are short-circuited, and a switching conduction signal cannot be provided for the second triode Q2.

[0172] 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 seventeenth resistor R17 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 eighteenth resistor R18 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.

[0173] Referring to Figure 12 , in the detection and protection device provided in some embodiments of the present invention, the fourth switch unit 242 includes a third triode Q3, and the fourteenth resistor R14 and the fifteenth resistor R15 connected in series between the first current-carrying line 110 and the second current-carrying line 120. The connection point of the fourteenth resistor R14 and the fifteenth resistor R15 is connected to the base of the third triode Q3. The emitter of the third triode Q3 is connected to the first shielding conductor structure and / or the second shielding conductor structure, and the collector of the third triode Q3 is connected to the third switch unit 241. It should be noted that the collector of the third triode Q3 can be directly connected to the third switch unit 241 or indirectly connected to the third switch unit 241. For example, referring to Figure 12 shown, the trigger module 240 further includes a nineteenth resistor R19, and the collector of the third triode Q3 is connected to the third switch unit 241 via the nineteenth resistor R19.

[0174] In this embodiment, the fourteenth resistor R14 and the fifteenth resistor R15 are connected in series between the first current-carrying line 110 and the second current-carrying line 120, and a voltage-dividing voltage is provided to the base of the third triode Q3 through the connection point of the fourteenth resistor R14 and the fifteenth resistor R15. When the voltage of the leakage signal received by the emitter of the third triode Q3 is greater than the voltage-dividing voltage of the base, the emitter junction of the third triode Q3 is forward-biased and conducts, and then the leakage signal is transmitted to the third switch unit 241 through the collector of the third triode Q3.

[0175] 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 connection conductor between the first shielding conductor structure 221, the second shielding conductor structure 222, and the third end c and the sixth end f, the emitter of the third triode Q3 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 emitter of the third triode Q3.

[0176] 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 it can be indirectly connected to the open-circuit detection module 230. For example, as shown in Figure 12 shown, the trigger module 240 further includes a nineteenth resistor R19, and the control pin of the third switch unit 241 is indirectly connected to the open-circuit detection module 230 through the nineteenth resistor R19, that is, the control pin of the third switch unit 241 is connected to one end of the nineteenth resistor R19, and the other end of the nineteenth resistor R19 is connected to the collectors of the first triode Q1 and the second triode Q2.

[0177] In addition, as shown in Figure 12 , the fourth switch unit 242 further includes a third diode D3. The emitter of the third triode Q3 is connected to the cathode of the third diode D3, and the anode of the third diode D3 is connected to any one of the following: the first end a; the second end b; the third end c; the fourth end d; the fifth end e; the sixth end f. It can be understood that setting the third diode D3 between the emitter of the third triode Q3 and the leakage detection module 220 can enable the leakage signal detected on the leakage detection module 220 to flow unidirectionally to the emitter of the third triode Q3.

[0178] As shown in Figure 12, 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.

[0179] 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 12 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.

[0180] Referring to Figure 12 , in the detection and protection device provided by some embodiments of the present invention, the leakage simulation module 250 further includes a sixteenth resistor R16. The other end of the third test switch TEST3 is connected to one end of the sixteenth resistor R16, and the other end of the sixteenth resistor R16 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 emitter of the third triode Q3 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 sixteenth resistor R16 is configured to: when the third test switch TEST3 is pressed and the open-circuit detection module 230 fails, adjust the potential of the emitter of the third triode Q3 so that the third triode Q3 is not turned on.

[0181] In this embodiment, for the third triode Q3, its collector is connected to the control electrode of the thyristor Q4 through the nineteenth resistor R19, its base is connected to the connection point of the fourteenth resistor R14 and the fifteenth resistor R15, and its emitter 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 third diode D3. 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 potential is 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 potential is lower than the potential of the connection point of the fourteenth resistor R14 and the fifteenth resistor R15, and the third triode Q3 will not be turned on. When the third test switch TEST3 is pressed, it is equivalent to the parallel connection of the sixty-fourth resistor R16 with the second resistor R2 and the fifth resistor R5, making the first equivalent resistance smaller, resulting in the potential of the first shielding conductor structure 221 and the second shielding conductor structure 222 rising to be greater than the potential of the connection point of the fourteenth resistor R14 and the fifteenth resistor R15. Furthermore, the third triode Q3 will be turned on, so that the voltage of the control electrode of the thyristor Q4 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 Q4 is turned on, forming a strong current path of the second current-carrying line 120 - the trip coil Lx - the thyristor Q4 - 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 electrical 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, the first equivalent resistance will become larger, and the potential of the first shielding conductor structure 221 and the second shielding conductor structure 222 will drop. At this time, when the third test switch TEST3 is pressed again, although the potential of the first shielding conductor structure 221 and the second shielding conductor structure 222 will rise, by reasonably configuring the resistance value of the sixteenth resistor R16, 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 turn on the third triode Q3. Therefore, when the open circuit detection module 230 fails and the user presses the third test switch TEST3 for testing, the third triode Q3 is not turned on, and the trip coil Lx will not drive the switch module 210 to disconnect the electrical connection. At this time, the user can judge that the detection and protection device is abnormal.

[0182] Refer to Figure 14, in the detection and protection device for a power cord provided in 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:

[0183] The switch module 210 is used to control the electrical connection between the input end and the output end of the power cord;

[0184] 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;

[0185] 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 second triode Q2, a first voltage-dividing unit, and a second voltage-dividing unit; the first voltage-dividing unit includes a second resistor R2, a first resistor R1, a seventeenth resistor R17, and a third resistor R3 connected in series in sequence, and the second voltage-dividing unit includes a fifth resistor R5, a fourth resistor R4, an eighteenth resistor R18, 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 seventeenth resistor R17 is connected to the base of the first triode Q1; the connection point of the seventeenth resistor R17 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 eighteenth resistor R18 is connected to the base of the second triode Q2; the connection point of the eighteenth resistor R18 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;

[0186] The trigger module 240 includes a third switch unit 241 connected to the open - circuit detection module 230, and a fourth switch unit 242 connected to the first shielding conductor structure and / or the second shielding conductor structure. The fourth switch unit 242 is connected to the third switch unit 241 and transmits a leakage signal to the third switch unit 241 when conducting. The third switch unit 241 is configured to receive the leakage signal and / or the 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 fourth switch unit 242 includes a third triode Q3, and a fourteenth resistor R14 and a fifteenth resistor R15 connected in series between the first current - carrying line 110 and the second current - carrying line 120. The connection point of the fourteenth resistor R14 and the fifteenth resistor R15 is connected to the base of the third triode Q3. The emitter of the third triode Q3 is connected to the sixth terminal f, and the collector of the third triode Q3 is connected to the third switch unit 241;

[0187] The leakage simulation module 250 includes a third test switch TEST3 and a sixteenth resistor R16. 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 sixteenth resistor R16, and the other end of the sixteenth resistor R16 is connected to the third terminal c.

[0188] Next, Figure 13 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:

[0189] 1. When the leakage signal of the first current - carrying line 110 is transmitted to the first shielding conductor structure 221:

[0190] After the first shielding conductor structure 221 obtains the leakage signal, it is transmitted to the sixth terminal f, so that the third triode Q3 conducts, forming a conduction path of the first current - carrying line 110 - the first shielding conductor structure 221 - the third diode D3 - the third triode Q3 - the seventh resistor R7 - the second diode D2 - the trip coil Lx - the second current - carrying line 120;

[0191] The voltage of the control electrode of the thyristor Q4 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 Q4 conducts, forming a strong current path of the second current - carrying line 120 - the trip coil Lx - the thyristor Q4 - the first diode D1 - the first current - carrying line 110;

[0192] 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.

[0193] 2. When the leakage signal of the second current-carrying line 120 is transmitted to the second shielding conductor structure 222:

[0194] After the second shielding conductor structure 222 obtains the leakage signal, it is transmitted to the sixth terminal f, so that the third triode Q3 conducts, forming a conduction path of the second current-carrying line 120 - the second shielding conductor structure 222 - the third diode D3 - the third triode Q3 - the seventh resistor R7 - the first diode D1 - the first current-carrying line 110;

[0195] The voltage of the control electrode of the thyristor Q4 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 Q4 conducts, forming a strong current path of the second current-carrying line 120 - the tripping coil Lx - the thyristor Q4 - the first diode D1 - the first current-carrying line 110;

[0196] 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.

[0197] 3. When the part of the first shielding conductor structure 221 between the first terminal a and the third terminal c is open:

[0198] The short-circuit path between the first terminal a and the fourth terminal d is disconnected, and the two ends of the first bias unit's first resistor R1 and seventeenth resistor R17 are no longer short-circuited; the two ends of the fourth resistor R4 and eighteenth resistor R18 of the second bias unit are still short-circuited, and the second bias 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;

[0199] A conduction path of the second current-carrying line 120 - the tripping coil Lx - the second resistor R2 - the first resistor R1 - the seventeenth resistor R17 - the third resistor R3 - the first diode D1 - the first current-carrying line 110 is formed;

[0200] 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 seventh resistor R7 - the first diode D1 - the first current-carrying line 110 is formed;

[0201] The voltage of the control electrode of the thyristor Q4 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 Q4 conducts, forming a strong current path of the second current-carrying line 120 - the tripping coil Lx - the thyristor Q4 - the first diode D1 - the first current-carrying line 110;

[0202] 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.

[0203] 4. When the part of the first shielding conductor structure 221 between the second end b and the third end c is open:

[0204] 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 and the eighteenth resistor R18 of the second biasing unit are no longer short - circuited; the two ends of the first resistor R1 and the seventeenth resistor R17 of the first biasing unit are still short - circuited, and the conduction path from 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 from the first end a - the third end c - the sixth end f - the fifth end e also exists simultaneously;

[0205] A conduction path of the second current - carrying line 120 - the tripping coil Lx - the fifth resistor R5 - the fourth resistor R4 - the eighteenth resistor R18 - the sixth resistor R6 - the first diode D1 - the first current - carrying line 110 is formed;

[0206] 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 tripping coil Lx - the fifth resistor R5 - the second triode Q2 - the seventh resistor R7 - the first diode D1 - the first current - carrying line 110 is formed;

[0207] The voltage of the control electrode of the thyristor Q4 increases. 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 Q4 is turned on, and a strong current path of the second current - carrying line 120 - the tripping coil Lx - the thyristor Q4 - the first diode D1 - the first current - carrying line 110 is formed;

[0208] 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.

[0209] 5. When the connecting conductor between the third end c and the sixth end f is open:

[0210] 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 and the seventeenth resistor R17 of the first biasing unit 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 fourth resistor R4 and the eighteenth resistor R18 of the second biasing unit are no longer short - circuited;

[0211] Form a conduction path of the second current-carrying line 120 - trip coil Lx - second resistor R2 - first resistor R1 - seventeenth resistor R17 - third resistor R3 - first diode D1 - first current-carrying line 110, and form a conduction path of the second current-carrying line 120 - trip coil Lx - fifth resistor R5 - fourth resistor R4 - eighteenth resistor R18 - sixth resistor R6 - first diode D1 - first current-carrying line 110;

[0212] Make both the first triode Q1 and the second triode Q2 conduct; form a conduction path of the second current-carrying line 120 - trip coil Lx - second resistor R2 - first triode Q1 - seventh resistor R7 - first diode D1 - first current-carrying line 110, and form a conduction path of the second current-carrying line 120 - trip coil Lx - fifth resistor R5 - second triode Q2 - seventh resistor R7 - first diode D1 - first current-carrying line 110;

[0213] The voltage of the control electrode of the thyristor Q4 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 Q4 conducts, forming a strong current path of the second current-carrying line 120 - trip coil Lx - thyristor Q4 - first diode D1 - first current-carrying line 110;

[0214] 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.

[0215] 6. When the part of the second shielding conductor structure 222 between the fourth end d and the sixth end f is open:

[0216] The short-circuit path between the first end a and the fourth end d is disconnected, and the two ends of the first bias unit's first resistor R1 and seventeenth resistor R17 are no longer short-circuited; the two ends of the fourth resistor R4 and eighteenth resistor R18 of the second bias unit are still short-circuited, and the second bias 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 also exists;

[0217] Form a conduction path of the second current-carrying line 120 - trip coil Lx - second resistor R2 - first resistor R1 - seventeenth resistor R17 - third resistor R3 - first diode D1 - first current-carrying line 110;

[0218] Make the first triode Q1 conduct, 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 - seventh resistor R7 - first diode D1 - first current-carrying line 110;

[0219] The voltage of the control electrode of thyristor Q4 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, thyristor Q4 conducts, forming a strong current path of the second current-carrying line 120 - trip coil Lx - thyristor Q4 - first diode D1 - first current-carrying line 110;

[0220] 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.

[0221] 7. When the part of the second shielding conductor structure 222 between the fifth end e and the sixth end f is open:

[0222] 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 and the eighteenth resistor R18 of the second biasing unit are no longer short-circuited; the two ends of the first resistor R1 and the seventeenth resistor R17 of the first biasing unit are still short-circuited, and the first biasing unit 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;

[0223] A conduction path of the second current-carrying line 120 - trip coil Lx - fifth resistor R5 - fourth resistor R4 - eighteenth resistor R18 - sixth resistor R6 - first diode D1 - first current-carrying line 110 is formed;

[0224] The second triode Q2 is made to conduct, while the first triode Q1 remains cut off; a conduction path of the second current-carrying line 120 - trip coil Lx - fifth resistor R5 - second triode Q2 - seventh resistor R7 - first diode D1 - first current-carrying line 110 is formed;

[0225] The voltage of the control electrode of thyristor Q4 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, thyristor Q4 conducts, forming a strong current path of the second current-carrying line 120 - trip coil Lx - thyristor Q4 - first diode D1 - first current-carrying line 110;

[0226] 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.

[0227] 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:

[0228] 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 series voltage division of the first equivalent resistance after the second resistor R2 and the fifth resistor R5 are connected in parallel and the second equivalent resistance after the third resistor R3 and the sixth resistor R6 are connected in parallel, and are at a level that will not cause the third triode Q3 to conduct;

[0229] 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 third triode Q3 to conduct, forming a conduction path of the second current-carrying line 120 - trip coil Lx - third test switch TEST3 - sixteenth resistor R16 - first shielding conductor structure 221 / second shielding conductor structure 222 - third diode D3 - third triode Q3 - seventh resistor R7 - first diode D1 - first current-carrying line 110;

[0230] The voltage of the control electrode of the thyristor Q4 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 Q4 conducts, forming a strong current path of the second current-carrying line 120 - trip coil Lx - thyristor Q4 - first diode D1 - first current-carrying line 110;

[0231] The trip coil Lx generates a strong electromagnetic force, thereby driving the switch module 210 to disconnect the electrical connection between the input end and the output end of the power line.

[0232] 9. When a fault occurs in the open-circuit detection module 230, such as a single device open-circuit or short-circuit, 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 third triode Q3 to conduct, resulting in tripping; the other is that the potentials of the first shielding conductor structure 221 and the second shielding conductor structure 222 decrease, resulting in no tripping when the user actively presses the third test switch TEST3 for testing.

[0233] The following lists various single-device faults that may occur in the open-circuit detection module 230:

[0234] 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 third triode Q3 remains in the cut-off state;

[0235] 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 shielding conductor structure 221 between the first end a and the third end c, but it can still trigger a trip in response to four open - circuit situations, such as a partial open - circuit of the first shielding 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 shielding conductor structure 222 between the fourth end d and the sixth end f, and a partial open - circuit of the second shielding conductor structure 222 between the fifth end e and the sixth end f;

[0236] It can be seen that in this case, if a partial open - circuit situation of the first shielding 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.

[0237] 9.2. When an open - circuit fault occurs in the fifth resistor R5 in the open - circuit detection module 230, it is similar to the situation where an open - circuit fault occurs in the second resistor R2 in 9.1.

[0238] 9.3. When an open - circuit fault occurs in the third resistor R3 in the open - circuit detection module 230, the second equivalent resistance becomes 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 third triode Q3 to conduct and trigger a trip.

[0239] 9.4. When an open - circuit fault occurs in the sixth resistor R6 in the open - circuit detection module 230, it is similar to the situation where an open - circuit fault occurs in the third resistor R3 in 9.3.

[0240] 9.5. When an open - circuit fault occurs in the first triode Q1 in the open - circuit detection module 230, the open - circuit detection module 230 cannot trigger a trip in response to a partial open - circuit situation of the first shielding conductor structure 221 between the first end a and the third end c;

[0241] It can be seen that in this case, if a partial open - circuit situation of the first shielding 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.

[0242] 9.6. When open - circuit faults occur in the second triode Q2, the seventeenth resistor R17, and the eighteenth resistor R18 in the open - circuit detection module 230, it is similar to the situation where an open - circuit fault occurs in the first triode Q1 in 9.5.

[0243] 9.7. When a short - circuit fault occurs in the second resistor R2 in the open - circuit detection module 230, the first equivalent resistance becomes zero, 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 third triode Q3 to conduct and trigger a trip.

[0244] 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.

[0245] 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 third triode Q3 remains in the cut - off state.

[0246] 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.

[0247] 9.11. When the first triode Q1 in the open - circuit detection module 230 has a short - circuit fault, the voltage of the control electrode of the thyristor Q4 will increase and trigger tripping.

[0248] 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.

[0249] 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.

[0250] 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, and 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 make the third triode Q3 conduct and trigger tripping, so that the user can visually see that no tripping occurs after pressing the third test switch TEST3, thereby judging that the detection and protection device is abnormal and cannot play the role of leakage protection or open - circuit protection of the shielding structure, and then stop using this faulty product, further improving the safety guarantee.

[0251] Referring to Figure 14 , an electrical connection device 300 is provided in the second - aspect embodiment of the present invention, 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.

[0252] 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 described in the second aspect embodiment above, and the output end of the power supply line is connected to the load device.

[0253] 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, the trigger module comprising a third switch unit connected to the open circuit detection module, and a fourth switch unit connected to the first shielded conductor structure and / or the second shielded conductor structure, the fourth switch unit being connected to the third switch unit and transmitting the leakage signal to the third switch unit when turned on, the third switch unit being 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 fourth switch unit includes a third transistor and a fourteenth resistor and a fifteenth resistor connected in series between the first current-carrying line and the second current-carrying line, the connection point of the fourteenth resistor and the fifteenth resistor is connected to the base of the third transistor, the emitter of the third transistor is connected to the first shielding conductor structure and / or the second shielding conductor structure, and the collector of the third transistor is connected to the third switch unit.

3. The detection and protection device according to claim 2, characterized in that: The fourth switch unit further includes a third diode, the emitter of the third triode is connected to the cathode of the third diode, and the anode of the third diode 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 third switch unit, 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 third switch unit. 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 third switch unit; 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 third switch unit.

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 third switch unit.

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 third switch unit.

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 third switch unit, 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 third switch unit. 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 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 collector of the third transistor 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, 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 1, characterized in that: A second test switch is also included, 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.

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 sixteenth 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 sixteenth resistor, and the sixteenth resistor is configured to: when the third test switch is pressed and the open circuit detection module fails, adjust the potential of the emitter of the third transistor to make the third transistor non-conductive.

17. 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 seventeenth resistor; The second switch unit includes a second triode, and the second bias unit includes a fourth resistor and an eighteenth 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 seventeenth resistor, and the other end of the seventeenth 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 eighteenth resistor, and the other end of the eighteenth 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 third switching unit.

18. The detection and protection device according to claim 17, characterized in that: The fourth switch unit includes a third transistor and a fourteenth resistor and a fifteenth resistor connected in series between the first current-carrying line and the second current-carrying line, the connection point of the fourteenth resistor and the fifteenth resistor is connected to the base of the third transistor, the emitter of the third transistor is connected to the first shielding conductor structure and / or the second shielding conductor structure, and the collector of the third transistor is connected to the third switch unit.

19. The detection and protection device according to claim 18, 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.

20. The detection and protection device according to claim 19, characterized in that: The leakage simulation module also includes a sixteenth resistor, the other end of the third test switch is connected to one end of the sixteenth resistor, and the other end of the sixteenth resistor is connected to the third end; the emitter of the third transistor is connected to the sixth end; the sixteenth resistor is configured to: when the third test switch is pressed and the open circuit detection module fails, adjust the potential of the emitter of the third transistor to make the third transistor non-conductive.

21. 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 second triode, a first voltage dividing unit and a second voltage dividing unit; The first voltage dividing unit comprises a second resistor, a first resistor, a seventeenth 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 seventeenth resistor is connected to the base of the first transistor; and a connection point between the seventeenth resistor and the third resistor is connected to the fourth end; The second voltage dividing unit comprises a fifth resistor, a fourth resistor, an eighteenth 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 eighteenth resistor is connected to the base of the second triode; a connection point between the eighteenth 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 fourth switch unit includes a third triode and a fourteenth resistor and a fifteenth resistor connected in series between the first current-carrying line and the second current-carrying line, the connection point of the fourteenth resistor and the fifteenth resistor is connected to the base of the third triode, the emitter of the third triode is connected to the sixth end, and the collector of the third triode is connected to the third switch unit; The leakage simulation module includes a third test switch and a sixteenth 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 sixteenth resistor, and the other end of the sixteenth resistor is connected to the third end.

22. An electrical connection device, characterized in that: It comprises the detection and protection device according to any one of claims 1 to 21, 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.

23. An electrical equipment, characterized in that: The invention comprises a load device and the electrical connection device according to claim 22, wherein the output end of the power line is connected to the load device.

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