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

Abstract

The invention discloses a detection protection device of a power line, electric connection equipment and electric equipment. The power line comprises a first current-carrying wire and a second current-carrying wire. The detection protection device comprises a switch module, an electric leakage detection module, a self-checking path module, a fault response module and a trigger module. The electric leakage detection module comprises a first shielding conductor structure and a second shielding conductor structure. The self-checking path module comprises a first self-checking unit and a second self-checking unit; the first current-carrying wire, the first self-checking unit, the first shielding conductor structure, the second shielding conductor structure, the second self-checking unit and the second current-carrying wire which are electrically coupled form an open-circuit self-checking path; the fault response module obtains an electric leakage signal or an open circuit signal generated when the open circuit self-checking path is open, and outputs a tripping trigger signal to enable the switch module to disconnect power connection; the feasibility and flexibility of electric leakage detection and shielding structure open circuit detection of the power line 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 particularly to a detection and protection device for a power cord, an electrical connection device, and an electrical device. Background Art

[0002] A leakage current detection circuit breaker (LCDI) is a power connection device for an electrical appliance, which 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 the leakage current detection line is open. Summary of the Invention

[0003] 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 device, which can enrich the feasibility and flexibility of detecting the leakage of the power cord and detecting the open circuit of the shielding structure, and is beneficial to improving the power supply safety of the power cord.

[0004] 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, a self-checking path module, a fault response module, and a trigger module, where: The switch module is used to control the electrical connection between the input end and the output end of the power cord; 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 cord, a second end close to the output end of the power cord, 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; The self-checking path module includes a first self-checking unit and a second self-checking unit. The first self-checking unit is electrically coupled between the first current-carrying line and the first shielding conductor structure, and the second self-checking unit is electrically coupled between the second current-carrying line and the second shielding conductor structure, so that the electrically coupled first current-carrying line, the first self-checking unit, the first shielding conductor structure, the second shielding conductor structure, the second self-checking unit, and the second current-carrying line form an open-circuit self-checking path; The fault response module is electrically coupled to the connection point between the first self-checking unit and the first shielding conductor structure, and outputs a tripping trigger signal in response to obtaining the leakage signal or the open-circuit signal generated when the open-circuit self-checking path is open; The trigger module is electrically coupled to the fault response module and the switch module respectively, and is configured to drive the switch module to disconnect the power connection in response to receiving the tripping trigger signal.

[0005] 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. 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, there is an associated point between 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 first self-checking unit and the second self-checking unit cooperate with the open-circuit self-checking path formed by the first shielding conductor structure, the second shielding conductor structure, the first current-carrying line and the second current-carrying line to 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 fault response module is electrically coupled to the connection point between the first self-checking unit and the first shielding conductor structure, and can obtain the leakage signal when there is no open circuit in the first shielding conductor structure and the second shielding conductor structure, and can also obtain the open-circuit signal when any detection path in the open-circuit self-checking path has an open circuit, so as to output a trip trigger signal to the trigger module, so that the trigger module drives the switch module to disconnect the power connection between the input end and the output end of the power cord, ensuring the power supply safety of the power cord. In the detection and protection device for the power cord of this embodiment, the shielding network formed by the first shielding conductor structure and the second shielding conductor structure with multiple detection segments 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 leakage detection and open-circuit detection of the shielding structure of the power cord, and being beneficial to improving the power supply safety of the power cord.

[0006] The detection and protection device provided by some embodiments of the present invention further includes a test module. The test module includes a test switch. One end of the test switch is connected to the second current-carrying line, and the other end is connected to the connection point between the second self-checking unit and the second shielding conductor structure.

[0007] According to the detection and protection device provided by some embodiments of the present invention, the first self-checking unit includes a first resistor and a second resistor. The first resistor is connected between the first current-carrying line and the first end, and the second resistor is connected between the first current-carrying line and the second end.

[0008] According to the detection and protection device provided by some embodiments of the present invention, the fault response module includes a third resistor, a fourth resistor, and a first switching tube. The third resistor and the fourth resistor are connected in series between the first current-carrying line and the second current-carrying line. The connection point of the third resistor and the fourth resistor is connected to the control pin of the first switching tube. One switching pin of the first switching tube is connected to the first end and the second end, and the other switching pin is connected to the trigger module.

[0009] According to the detection and protection device provided by some embodiments of the present invention, it further includes a first unidirectional conduction module. The first unidirectional conduction module includes a first diode and a second diode. The first end is connected to the anode of the first diode, and the second end is connected to the anode of the second diode. The cathodes of the first diode and the second diode are both connected to one switching pin of the first switching tube.

[0010] According to the detection and protection device provided by some embodiments of the present invention, the second self-checking unit includes a fifth resistor and a sixth resistor. The fifth resistor is connected between the second current-carrying line and the fourth end, and the sixth resistor is connected between the second current-carrying line and the fifth end.

[0011] According to the detection and protection device provided by some embodiments of the present invention, it further includes a second unidirectional conduction module. The second unidirectional conduction module includes a third diode and a fourth diode. The test module further includes a seventh resistor. The other end of the test switch is connected to one end of the seventh resistor. The other end of the seventh resistor is connected to the anodes of the third diode and the fourth diode. The cathode of the third diode is connected to the fourth end, and the cathode of the fourth diode is connected to the fifth end.

[0012] According to the detection and protection device provided by some embodiments of the present invention, the trigger module further includes a thyristor and a trip coil for generating an electromagnetic force to drive the switch module to disconnect the power connection. The first current-carrying line is connected to one end of the trip coil. The other end of the trip coil is connected to the anode of the thyristor. The cathode of the thyristor is connected to the second current-carrying line. The control electrode of the thyristor is connected to the output end of the fault response module.

[0013] According to the detection and protection device provided by some embodiments of the present invention, the trigger module further includes a fifth diode and a sixth diode. The cathode of the thyristor is connected to the anodes of the fifth diode and the sixth diode. The cathode of the fifth diode is connected to the second current-carrying line, and the cathode of the sixth diode is connected to the connection point between the trip coil and the thyristor.

[0014] According to the detection and protection device provided by some embodiments of the present invention, the trigger module further includes a thyristor drive module. The thyristor drive module includes an eighth resistor, a ninth resistor, and a first capacitor. The output end of the fault response module is connected to one end of the eighth resistor. The other end of the eighth resistor is respectively connected to one end of the ninth resistor, one end of the first capacitor, and the control electrode of the thyristor. The other ends of the ninth resistor and the first capacitor are both connected to the connection point between the thyristor and the fifth diode.

[0015] According to the detection and protection device provided by some embodiments of the present invention, the trigger module further includes a first varistor connected in parallel with the thyristor.

[0016] According to the detection and protection device provided by some embodiments of the present invention, it further includes an indication module connected in parallel with the thyristor. The indication module includes a tenth resistor and a light-emitting diode connected in series.

[0017] According to the detection and protection device provided by some embodiments of the present invention, it further includes a lightning protection module. The lightning protection module includes a second varistor. The two ends of the second varistor are respectively connected to the first current-carrying line and the second current-carrying line.

[0018] 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. The switch module, the self-checking path module, the fault response module, and the trigger module are arranged in the housing.

[0019] 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.

[0020] Other features and advantages of the present invention will be described in the subsequent specification, and part of them will become obvious from the specification or be understood by implementing the present invention. The objectives and other advantages of the present invention can be achieved and obtained through the structures specifically pointed out in the specification, claims, and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings are used to provide a further understanding of the technical solutions of the present invention, and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the technical solutions of the present invention, and do not constitute a limitation to the technical solutions of the present invention.

[0022] The following further describes the present invention in conjunction with the accompanying drawings and embodiments; Figure 1 is a block diagram of the module principle of the detection and protection device provided by an embodiment of the present invention; Figure 2 is a circuit schematic diagram of the detection and protection device provided by an embodiment of the present invention; Figure 3 is a schematic diagram of the leakage signal flow when the first current-carrying line has a leakage in the embodiment of the present invention; Figure 4 is a schematic diagram of the leakage signal flow when the second current-carrying line has a leakage in the embodiment of the present invention; Figure 5 is a schematic diagram of the open-circuit signal flow when a part between the first end and the third end of the first shielding conductor structure has an open circuit in the embodiment of the present invention; Figure 6 is a schematic diagram of the open-circuit signal flow when a part between the second end and the third end of the first shielding conductor structure has an open circuit in the embodiment of the present invention; Figure 7 is a schematic diagram of the open-circuit signal flow when the connecting conductor between the third end of the first shielding conductor structure and the sixth end of the second shielding conductor structure has an open circuit in the embodiment of the present invention; Figure 8 is a schematic diagram of the open-circuit signal flow when a part between the fourth end and the sixth end of the second shielding conductor structure has an open circuit in the embodiment of the present invention; Figure 9 is a schematic diagram of the open-circuit signal flow when a part between the fifth end and the sixth end of the second shielding conductor structure has an open circuit in the embodiment of the present invention; Figure 10 is a schematic diagram of the simulated leakage signal flow when the test switch is pressed in the embodiment of the present invention; Figure 11 is a schematic diagram of the structure of the electrical connection device provided by an embodiment of the present invention. Detailed implementation manners

[0023] 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 role 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 cannot be construed as a limitation to the protection scope of the present invention.

[0024] 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, 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.

[0025] 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 a connection that can communicate with each other; it can be directly connected or indirectly connected through an intermediate medium.

[0026] 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.

[0027] 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 to ensure safe use. In recent years, in addition to detecting the leakage current of the power cord 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.

[0028] Based on this, the embodiments of the present invention provide a detection and protection device for a power cord, an electrical connection device, and an electrical device, which can enrich the feasibility and flexibility of detecting the leakage of the power cord and detecting the open circuit of the shielding structure, and is beneficial to improving the power supply safety of the power cord.

[0029] The following further elaborates on the embodiments of the present invention in conjunction with the drawings.

[0030] Figure 1 is the module principle block diagram of the detection and protection device provided by the embodiments of the present invention; Figure 2 is the circuit schematic diagram of the detection and protection device provided by the embodiments of the present invention. Refer to Figure 1 and Figure 2, an embodiment of the first aspect of the present invention provides a detection and protection device for a power cord, where: the power cord includes a first current-carrying line 110 and a second current-carrying line 120.

[0031] It can be understood that when the power cord 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 cord 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. Below, taking Figure 2 the situation shown, that is, the situation where the first current-carrying line 110 is the neutral wire N and the second current-carrying line 120 is the live wire L, as an example for illustration, the same applies to the other situations.

[0032] The detection and protection device includes: a switch module 210, a leakage detection module 220, a self-checking path module 230, a fault response module 240, and a trigger module 250, where: The switch module 210 is used to control the electrical connection between the input end and the output end of the power cord; referring to Figure 2 shown, the switch module 210 is provided with switch terminals on the first current-carrying line 110 and the second current-carrying line 120. When the switch terminals of the switch module 210 are closed, the electrical connection between the input end and the output end of the power cord is conducted; when the switch terminals of the switch module 210 are opened, the electrical connection between the input end and the output end of the power cord is disconnected.

[0033] 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 supply line, a second end b near the output end of the power supply line, and a third end c located 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 located 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 to the sixth end f in the second shielding conductor structure 222, there is an associated point between the shielding conductor structures of the first current-carrying line 110 and the second current-carrying line 120, and the two shielding conductor structures are no longer independently separated.

[0034] The self-checking path module 230 includes a first self-checking unit 231 and a second self-checking unit 232. The first self-checking unit 231 is electrically coupled between the first current-carrying line 110 and the first shielding conductor structure 221, and the second self-checking unit 232 is electrically coupled between the second current-carrying line 120 and the second shielding conductor structure 222, so that the first current-carrying line 110, the first self-checking unit 231, the first shielding conductor structure 221, the second shielding conductor structure 222, the second self-checking unit 232, and the second current-carrying line 120 that are electrically coupled in sequence form an open-circuit self-checking path. It can be understood that the open-circuit self-checking path formed by the cooperation of the first self-checking unit 231 and the second self-checking unit 232 with the first shielding conductor structure 221, the second shielding conductor structure 222, the first current-carrying line 110, and the second current-carrying line 120 can perform open-circuit detection on a variety of different detection paths. For example, the detection path from the first end a to the third end c of the first shielding conductor structure 221, 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 to the third end c of the first shielding conductor structure 221, 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 to the third end c of the first shielding conductor structure 221, 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 to the third end c of the first shielding conductor structure 221, 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.

[0035] The fault response module 240 is electrically coupled to the connection point between the first self-checking unit 231 and the first shielding conductor structure 221, and outputs a tripping trigger signal in response to obtaining a leakage signal or an open-circuit signal generated when the open-circuit self-checking path is open. The trigger module 250 is electrically coupled to the fault response module 240 and the switch module 210 respectively, and is configured to drive the switch module 210 to disconnect the power connection in response to receiving the tripping trigger signal.

[0036] According to the detection and protection device for a power cord provided by an embodiment of the present invention, the fault response module 240 is electrically coupled to the connection point between the first self-check unit 231 and the first shielding conductor structure 221. It can obtain a leakage signal when there is no open circuit in the first shielding conductor structure 221 and the second shielding conductor structure 222, and can also obtain an open circuit signal when any detection path in the open circuit self-check path has an open circuit. Then, it outputs a trip trigger signal to the trigger module 250, so that the trigger module 250 drives the switch module 210 to disconnect the power connection between the input end and the output end of the power cord, ensuring 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 221 and the second shielding conductor structure 222 form a shielding network with multiple detection segments that can be combined, so as to construct a shielding network with a variety of different detection paths, greatly enriching the feasibility and flexibility of the leakage detection of the power cord and the open circuit detection of the shielding structure, which is beneficial to improving the power supply safety of the power cord.

[0037] Referring to Figure 1 and Figure 2 , in the detection and protection device provided by some embodiments of the present invention, it further includes a test module 260. The test module 260 includes a test switch TEST. One end of the test switch TEST is connected to the second current-carrying line 120, and the other end is connected to the connection point between the second self-check unit 232 and the second shielding conductor structure 222.

[0038] In this embodiment, when the test switch TEST in the test module 260 is pressed, it is equivalent to directly connecting the second current-carrying line 120 to the second shielding conductor structure 222, that is, simulating the leakage signal of the second current-carrying line 120 being transmitted to the second shielding conductor structure 222, so as to test whether the leakage detection function of the detection and protection device is intact.

[0039] It should also be noted that since the fault response module 240 is connected to the connection point between the first self-check unit 231 and the first shielding conductor structure 221, and the other end of the test switch TEST is connected to the connection point between the second self-check unit 232 and the second shielding conductor structure 222. Therefore, when the test switch TEST is pressed, the simulated leakage signal first flows through the second shielding conductor structure 222 from the other end of the test switch TEST, then flows to the third end c of the first shielding conductor structure 221 through the sixth end f of the second shielding conductor structure 222, then flows through the first shielding conductor structure 221, and finally reaches the fault response module 240. That is, the simulated leakage signal completely flows through the leakage detection module 220. Thus, it can be determined whether the first shielding conductor structure 221 and the second shielding conductor structure 222 have an open circuit by whether the fault response module 240 receives the simulated leakage signal after pressing the test switch TEST.

[0040] Reference Figure 2 In the detection and protection device provided by some embodiments of the present invention, as shown in Figure 2 , the first self-checking unit 231 includes a first resistor R1 and a second resistor R2. The first resistor R1 is connected between the first current-carrying line 110 and the first end a, and the second resistor R2 is connected between the first current-carrying line 110 and the second end b.

[0041] In this embodiment, the first end a of the first shielding conductor structure 221 is separated from the first current-carrying line 110 by the first resistor R1, and the second end b of the first shielding conductor structure 221 is separated from the first current-carrying line 110 by the second resistor R2, so as to reduce the potential of the first shielding conductor structure 221 in the open-circuit self-checking path, so that under normal circumstances, the potential of the first shielding conductor structure 221 will not trigger the fault response module 240 to output a trip trigger signal.

[0042] It should be noted that when there is no open circuit in the first shielding conductor structure 221, the first end a and the second end b of the first shielding conductor structure 221 are equipotential points. At this time, the first resistor R1 and the second resistor R2 are equivalent to being in a parallel state.

[0043] Reference Figure 2 In the detection and protection device provided by some embodiments of the present invention, as shown in Figure 2 , the second self-checking unit 232 includes a fifth resistor R5 and a sixth resistor R6. The fifth resistor R5 is connected between the second current-carrying line 120 and the fourth end d, and the sixth resistor R6 is connected between the second current-carrying line 120 and the fifth end e.

[0044] In this embodiment, the fourth end d of the second shielding conductor structure 222 is separated from the second current-carrying line 120 by the fifth resistor R5, and the fifth end e of the second shielding conductor structure 222 is separated from the second current-carrying line 120 by the sixth resistor R6, so as to reduce the potential of the second shielding conductor structure 222 in the open-circuit self-checking path, so that under normal circumstances, the potential of the second shielding conductor structure 222 will not trigger the fault response module 240 to output a trip trigger signal.

[0045] It should be noted that when there is no open circuit in the second shielding conductor structure 222, the fourth end d and the fifth end e of the second shielding conductor structure 222 are equipotential points. At this time, the fifth resistor R5 and the sixth resistor R6 are equivalent to being in a parallel state.

[0046] It should also be noted that, since the third end c of the first shielding conductor structure 221 is connected to the sixth end f of the second shielding conductor structure 222, when there is no open circuit in the first shielding conductor structure 221, the second shielding conductor structure 222, and the connection lines between the third end c and the sixth end f, any point on the first shielding conductor structure 221 and any point on the second shielding conductor structure 222 are equipotential points. At this time, the potentials of the first shielding conductor structure 221 and the second shielding conductor structure 222 are determined by the voltage division ratio of the first parallel resistor and the second parallel resistor, where: the first parallel resistor is the resistor obtained by connecting the first resistor R1 and the second resistor R2 in parallel, and the second parallel resistor is the resistor obtained by connecting the fifth resistor R5 and the sixth resistor R6 in parallel.

[0047] Referring to Figure 2 , in the detection and protection device provided in some embodiments of the present invention, the fault response module 240 includes a third resistor R3, a fourth resistor R4, and a first switching tube Q1. The third resistor R3 and the fourth resistor R4 are connected in series between the first current-carrying line 110 and the second current-carrying line 120. The connection point of the third resistor R3 and the fourth resistor R4 is connected to the control pin of the first switching tube Q1. One switching pin of the first switching tube Q1 is connected to the first end a and the second end b, and the other switching pin is connected to the trigger module 250. Specifically, the first switching tube Q1 is a triode Q1. The connection point of the third resistor R3 and the fourth resistor R4 is connected to the base of the triode Q1. The emitter of the triode Q1 is connected to the first end a and the second end b, and the collector of the triode Q1 is connected to the trigger module 250.

[0048] In this embodiment, the third resistor R3 and the fourth resistor R4 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 triode Q1 through the connection point of the third resistor R3 and the fourth resistor R4. When the voltage received by the emitter of the triode Q1 is greater than the voltage-dividing voltage of the base, the emitter junction of the triode Q1 is forward-biased and conducts, and then a tripping trigger signal is output to the trigger module 250 through the collector of the triode Q1.

[0049] Referring to Figure 2 , in the detection and protection device provided in some embodiments of the present invention, it further includes a first unidirectional conduction module 241. The first unidirectional conduction module 241 includes a first diode D1 and a second diode D2. The first end a is connected to the anode of the first diode D1, the second end b is connected to the anode of the second diode D2, and the cathodes of the first diode D1 and the second diode D2 are both connected to one switching pin of the first switching tube Q1.

[0050] In this embodiment, the first diode D1 in the first unidirectional conduction module 241 allows the leakage signal on the first shielding conductor structure 221 and the open-circuit signal generated when the open-circuit self-checking path is open to be unidirectionally transmitted from the first end a to the emitter of the triode Q1 only; similarly, the second diode D2 in the first unidirectional conduction module 241 allows the leakage signal on the first shielding conductor structure 221 and the open-circuit signal generated when the open-circuit self-checking path is open to be unidirectionally transmitted from the second end b to the emitter of the triode Q1 only.

[0051] Refer to Figure 2 , in the detection and protection device provided in some embodiments of the present invention, it further includes a second unidirectional conduction module 261. The second unidirectional conduction module 261 includes a third diode D3 and a fourth diode D4. The test module 260 further includes a seventh resistor R7. The other end of the test switch TEST is connected to one end of the seventh resistor R7. The other end of the seventh resistor R7 is connected to the anodes of the third diode D3 and the fourth diode D4. The cathode of the third diode D3 is connected to the fourth end d, and the cathode of the fourth diode D4 is connected to the fifth end e.

[0052] In this embodiment, the third diode D3 in the second unidirectional conduction module 261 allows the analog leakage signal from the second current-carrying line 120 to be unidirectionally transmitted to the fourth end d of the second shielding conductor structure 222 only via the seventh resistor R7 when the test switch TEST is pressed; similarly, the fourth diode D4 in the second unidirectional conduction module 261 allows the analog leakage signal from the second current-carrying line 120 to be unidirectionally transmitted to the fifth end e of the second shielding conductor structure 222 only via the seventh resistor R7 when the test switch TEST is pressed.

[0053] Refer to Figure 2 , in the detection and protection device provided in some embodiments of the present invention, the trigger module 250 further includes a thyristor Q2 and a tripping coil Lx for generating an electromagnetic force to drive the switch module 210 to disconnect the power connection. The first current-carrying line 110 is connected to one end of the tripping coil Lx. The other end of the tripping coil Lx is connected to the anode of the thyristor Q2. The cathode of the thyristor Q2 is connected to the second current-carrying line 120. The control electrode of the thyristor Q2 is connected to the output end of the fault response module 240.

[0054] It should be noted that it was previously mentioned that the first self-checking unit 231 includes a first resistor R1 and a second resistor R2. The first resistor R1 is connected between the first current-carrying line 110 and the first end a, and the second resistor R2 is connected between the first current-carrying line 110 and the second end b. Among them, the first resistor R1 and the second resistor R2 can be directly connected to the first current-carrying line 110 or indirectly connected to the first current-carrying line 110. For example, refer to Figure 2As shown, the first resistor R1 is used to connect to one end of the first current-carrying line 110. After being connected together with the second resistor R2 which is used to connect to one end of the first current-carrying line 110, it is connected to the first current-carrying line 110 via the trip coil Lx. That is, the connection point of the first resistor R1 and the second resistor R2 is connected to the connection point of the trip coil Lx and the thyristor Q2. Such a setting can reduce the number of connection points led out from the first current-carrying line 110.

[0055] Referring to Figure 2 , in the detection and protection device provided in some embodiments of the present invention, the trigger module 250 further includes a fifth diode D5 and a sixth diode D6. The cathode of the thyristor Q2 is connected to the anodes of the fifth diode D5 and the sixth diode D6. The cathode of the fifth diode D5 is connected to the second current-carrying line 120, and the cathode of the sixth diode D6 is connected to the connection point of the trip coil Lx and the thyristor Q2.

[0056] It should be noted that it was previously mentioned that the second self-checking unit 232 includes a fifth resistor R5 and a sixth resistor R6. The fifth resistor R5 is connected between the second current-carrying line 120 and the fourth terminal d, and the sixth resistor R6 is connected between the second current-carrying line 120 and the fifth terminal e. Among them, the fifth resistor R5 and the sixth resistor R6 can be directly connected to the second current-carrying line 120 or indirectly connected to the second current-carrying line 120. For example, referring to Figure 2 As shown, the fifth resistor R5 is used to connect to one end of the second current-carrying line 120. After being connected together with the sixth resistor R6 which is used to connect to one end of the second current-carrying line 120, it is connected to the second current-carrying line 120 via the fifth diode D5. That is, the connection point of the fifth resistor R5 and the sixth resistor R6 is connected to the connection point of the fifth diode D5 and the sixth diode D6. Such a setting can reduce the number of connection points led out from the second current-carrying line 120.

[0057] Referring to Figure 2 , in the detection and protection device provided in some embodiments of the present invention, the trigger module 250 further includes a thyristor drive module 251. The thyristor drive module 251 includes an eighth resistor R8, a ninth resistor R9, and a first capacitor C1. The output end of the fault response module 240 is connected to one end of the eighth resistor R8. The other end of the eighth resistor R8 is respectively connected to one end of the ninth resistor R9, one end of the first capacitor C1, and the control electrode of the thyristor Q2. The other ends of the ninth resistor R9 and the first capacitor C1 are both connected to the connection point of the thyristor Q2 and the fifth diode D5. In addition, the thyristor drive module 251 further includes a second capacitor C2 connected in parallel with the first capacitor C1.

[0058] In this embodiment, when the first switching transistor Q1 is turned on, the current signal flowing through the first switching transistor Q1 charges the first capacitor C1 and the second capacitor C2 after passing through the eighth resistor R8, and the potential of the control electrode of the thyristor Q2 increases. When it reaches the negative half-cycle of the AC power supply, that is, the level of the first current-carrying line 110 is greater than the level of the second current-carrying line 120, the thyristor Q2 is turned on, forming a strong current path of the first current-carrying line 110 - trip coil Lx - thyristor Q2 - fifth diode D5 - second current-carrying line 120; 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.

[0059] Referring to Figure 2 , in the detection and protection device provided in some embodiments of the present invention, the trigger module 250 further includes a first varistor ZR1 connected in parallel with the thyristor Q2. 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. Therefore, setting the first varistor ZR1 in parallel with the thyristor Q2 can protect the thyristor Q2 from being easily damaged.

[0060] Referring to Figure 2 , in the detection and protection device provided in some embodiments of the present invention, it further includes an indication module 270 connected in parallel with the thyristor Q2. The indication module 270 includes an eleventh resistor R11, a tenth resistor R10, and a light-emitting diode LED1 connected in series.

[0061] Referring to Figure 2 , in the detection and protection device provided in some embodiments of the present invention, it further includes a lightning protection module 280. The lightning protection module 280 includes a second varistor ZR2. The two ends of the second varistor ZR2 are respectively connected to the first current-carrying line 110 and the second current-carrying line 120. 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. Therefore, setting the second varistor ZR2 before the first current-carrying line 110 and the second current-carrying line 120 can protect the subsequent components in the detection and protection device from being easily damaged by the lightning voltage.

[0062] Next, taking the Figure 2 illustrated embodiment as an example, the operation of the detection and protection device provided in the embodiments of the present invention under various leakage and open-circuit conditions will be introduced: 1. When the leakage signal of the first current-carrying line 110 is transmitted to the first shielding conductor structure 221: After the first shielding conductor structure 221 obtains this leakage signal, referring to Figure 3As shown, on the one hand, it is transmitted from the first terminal a through the first diode D1 to the emitter of the triode Q1, and on the other hand, it is transmitted from the second terminal b through the second diode D2 to the emitter of the triode Q1, causing the triode Q1 to conduct; After the triode Q1 conducts, the leakage signal charges the first capacitor C1 and the second capacitor C2, and the voltage at the control electrode of the thyristor Q2 increases. When it reaches the negative half-cycle of the AC power supply, that is, the level of the first current-carrying line 110 is greater than the level of the second current-carrying line 120, the thyristor Q2 conducts, forming a strong current path of the first current-carrying line 110 - the trip coil Lx - the thyristor Q2 - the fifth diode D5 - the second current-carrying line 120; 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.

[0063] 2. When the leakage signal of the second current-carrying line 120 is transmitted to the second shielding conductor structure 222: After the second shielding conductor structure 222 obtains the leakage signal, referring to Figure 4 As shown, it is transmitted from the sixth terminal f to the third terminal c of the first shielding conductor structure 221. On the one hand, it is transmitted from the first terminal a through the first diode D1 to the emitter of the triode Q1, and on the other hand, it is transmitted from the second terminal b through the second diode D2 to the emitter of the triode Q1, causing the triode Q1 to conduct; After the triode Q1 conducts, the leakage signal charges the first capacitor C1 and the second capacitor C2, and the voltage at the control electrode of the thyristor Q2 increases. When it reaches the negative half-cycle of the AC power supply, that is, the level of the first current-carrying line 110 is greater than the level of the second current-carrying line 120, the thyristor Q2 conducts, forming a strong current path of the first current-carrying line 110 - the trip coil Lx - the thyristor Q2 - the fifth diode D5 - the second current-carrying line 120; 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.

[0064] 3. When the part of the first shielding conductor structure 221 between the first terminal a and the third terminal c is open: The first resistor R1 is no longer in parallel with the second resistor R2. When it reaches the negative half-cycle of the AC power supply, that is, the level of the first current-carrying line 110 is greater than the level of the second current-carrying line 120, referring to Figure 5 As shown, an open-circuit signal is generated at the connection point of the first resistor R1 and the first diode D1 and is transmitted through the first diode D1 to the emitter of the triode Q1, causing the triode Q1 to conduct; After the triode Q1 conducts, the open-circuit signal charges the first capacitor C1 and the second capacitor C2, and the voltage at the control electrode of the thyristor Q2 increases. When it comes to the negative half-cycle of the AC power supply, that is, the level of the first current-carrying line 110 is greater than the level of the second current-carrying line 120, the thyristor Q2 conducts, forming a strong current path of the first current-carrying line 110 - trip coil Lx - thyristor Q2 - fifth diode D5 - second current-carrying line 120; 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.

[0065] 4. When a part of the first shielding conductor structure 221 between the second end b and the third end c is open-circuited: The second resistor R2 is no longer in parallel with the first resistor R1. When it comes to the negative half-cycle of the AC power supply, that is, the level of the first current-carrying line 110 is greater than the level of the second current-carrying line 120, referring to Figure 6 As shown, an open-circuit signal is generated at the connection point between the second resistor R2 and the second diode D2 and is transmitted to the emitter of the triode Q1 via the second diode D2, causing the triode Q1 to conduct; After the triode Q1 conducts, the open-circuit signal charges the first capacitor C1 and the second capacitor C2, and the voltage at the control electrode of the thyristor Q2 increases. When it comes to the negative half-cycle of the AC power supply, that is, the level of the first current-carrying line 110 is greater than the level of the second current-carrying line 120, the thyristor Q2 conducts, forming a strong current path of the first current-carrying line 110 - trip coil Lx - thyristor Q2 - fifth diode D5 - second current-carrying line 120; 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.

[0066] 5. When the connecting conductor between the third end c and the sixth end f is open-circuited: The first parallel resistor obtained by connecting the first resistor R1 and the second resistor R2 in parallel is no longer connected to the second parallel resistor obtained by connecting the fifth resistor R5 and the sixth resistor R6 in parallel. When it comes to the negative half-cycle of the AC power supply, that is, the level of the first current-carrying line 110 is greater than the level of the second current-carrying line 120, referring to Figure 7 As shown, an open-circuit signal is generated at the connection point between the first resistor R1 and the first diode D1 and is transmitted to the emitter of the triode Q1 via the first diode D1, and an open-circuit signal is generated at the connection point between the second resistor R2 and the second diode D2 and is transmitted to the emitter of the triode Q1 via the second diode D2, causing the triode Q1 to conduct; After the triode Q1 conducts, the open-circuit signal charges the first capacitor C1 and the second capacitor C2, raising the voltage at the control electrode of the thyristor Q2. When it reaches the negative half-cycle of the AC power supply, that is, when the level of the first current-carrying line 110 is greater than the level of the second current-carrying line 120, the thyristor Q2 conducts, forming a strong current path of the first current-carrying line 110 - trip coil Lx - thyristor Q2 - fifth diode D5 - second current-carrying line 120; 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.

[0067] 6. When a part of the second shielding conductor structure 222 between the fourth end d and the sixth end f is open-circuited: The fifth resistor R5 is no longer in parallel with the sixth resistor R6, causing the voltages at the first end a, the second end b, the third end c of the first shielding conductor structure 221, the fifth end e, and the sixth end f of the second shielding conductor structure 222 to rise. Refer to Figure 8 As shown, it is equivalent to an open-circuit signal being generated at the connection point of the first resistor R1 and the first diode D1 and being transmitted to the emitter of the triode Q1 via the first diode D1, and an open-circuit signal being generated at the connection point of the second resistor R2 and the second diode D2 and being transmitted to the emitter of the triode Q1 via the second diode D2, causing the triode Q1 to conduct; After the triode Q1 conducts, the open-circuit signal charges the first capacitor C1 and the second capacitor C2, raising the voltage at the control electrode of the thyristor Q2. When it reaches the negative half-cycle of the AC power supply, that is, when the level of the first current-carrying line 110 is greater than the level of the second current-carrying line 120, the thyristor Q2 conducts, forming a strong current path of the first current-carrying line 110 - trip coil Lx - thyristor Q2 - fifth diode D5 - second current-carrying line 120; 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.

[0068] 7. When a part of the second shielding conductor structure 222 between the fifth end e and the sixth end f is open-circuited: The sixth resistor R6 is no longer in parallel with the fifth resistor R5, causing the voltages at the first end a, the second end b, the third end c of the first shielding conductor structure 221, the fourth end d, and the sixth end f of the second shielding conductor structure 222 to rise. Refer to Figure 9 As shown, it is equivalent to an open-circuit signal being generated at the connection point of the first resistor R1 and the first diode D1 and being transmitted to the emitter of the triode Q1 via the first diode D1, and an open-circuit signal being generated at the connection point of the second resistor R2 and the second diode D2 and being transmitted to the emitter of the triode Q1 via the second diode D2, causing the triode Q1 to conduct; After the triode Q1 is turned on, the open-circuit signal charges the first capacitor C1 and the second capacitor C2, and the voltage at the control electrode of the thyristor Q2 increases. When it comes to the negative half-cycle of the AC power supply, that is, the level of the first current-carrying line 110 is greater than the level of the second current-carrying line 120, the thyristor Q2 is turned on, forming a strong current path of the first current-carrying line 110 - trip coil Lx - thyristor Q2 - fifth diode D5 - second current-carrying line 120; 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.

[0069] 8. When the test switch TEST is pressed: During the positive 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 simulated leakage signal from the second current-carrying line 120 first passes through the test switch TEST and then through the seventh resistor R7. On the one hand, it is transmitted to the fourth terminal d of the second shielding conductor structure 222 via the third diode D3, and successively flows through the sixth terminal f of the second shielding conductor structure 222, the third terminal c, the first terminal a of the first shielding conductor structure 221, and the first diode D1 to reach the emitter of the triode Q1. On the other hand, it is transmitted to the fifth terminal e of the second shielding conductor structure 222 via the fourth diode D4, and successively flows through the sixth terminal f of the second shielding conductor structure 222, the third terminal c, the second terminal b of the first shielding conductor structure 221, and the second diode D2 to reach the emitter of the triode Q1, causing the triode Q1 to be turned on; After the triode Q1 is turned on, a conduction path is formed from the triode Q1 - eighth resistor R8 - ninth resistor R9 - sixth diode D6 - trip coil Lx - second current-carrying line 120. The simulated leakage signal charges the first capacitor C1 and the second capacitor C2, and the voltage at the control electrode of the thyristor Q2 increases; When it comes to the negative half-cycle of the AC power supply, that is, the level of the first current-carrying line 110 is greater than the level of the second current-carrying line 120, the thyristor Q2 is turned on, forming a strong current path of the first current-carrying line 110 - trip coil Lx - thyristor Q2 - fifth diode D5 - second current-carrying line 120; 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.

[0070] The detection and protection device provided by the embodiment of the present invention can not only detect the leakage signal on the current-carrying line through the leakage detection module 220, but also cooperate with the leakage detection module 220 and the current-carrying line through the self-checking path module 230 to construct an open-circuit self-checking path, so as to realize the leakage detection of the power supply line and the automatic open-circuit detection of the shielding structure of the power supply line; the manual open-circuit detection of the shielding structure of the power supply line is also realized by pressing the test switch TEST of the test module 260; moreover, the first shielding conductor structure 221 and the second shielding conductor structure 222 can form a combination with multiple detection segments, so as to be able to construct a shielding network with multiple different detection paths, greatly enriching the feasibility and flexibility of the leakage detection of the power supply line and the open-circuit detection of the shielding structure, which is beneficial to improving the power supply safety of the power supply line.

[0071] Referring to Figure 11 , the second aspect embodiment of the present invention provides an electrical connection device 300, including the detection and protection device of the first aspect embodiment as above, a housing 310 and a power supply line, the power supply line is connected to the housing 310, and the switch module 210, the self-checking path module 230, the fault response module 240 and the trigger module 250 are arranged in the housing 310.

[0072] In addition, the third aspect embodiment of the present invention provides an electrical equipment, including a load device and the electrical connection device 300 described in the second aspect embodiment as above, and the output end of the power supply line is connected to the load device.

[0073] The embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments. Within the knowledge scope of those of ordinary skill in the art in the technical field, various changes can be made without departing from the purpose of the present invention.

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; A self-test path module, comprising a first self-test unit and a second self-test unit, wherein the first self-test unit is electrically coupled between the first current-carrying line and the first shielding conductor structure, and the second self-test unit is electrically coupled between the second current-carrying line and the second shielding conductor structure, so that the electrically coupled first current-carrying line, the first self-test unit, the first shielding conductor structure, the second shielding conductor structure, the second self-test unit, and the second current-carrying line form an open circuit self-test path; a fault response module, electrically coupled to a connection point between the first self-checking unit and the first shielded conductor structure, and outputting a trip trigger signal in response to obtaining the leakage signal or obtaining an open circuit signal generated when the open circuit self-checking path is open; The trigger module is electrically coupled to the fault response module and the switch module respectively, and is configured to drive the switch module to disconnect the power connection in response to receiving the trip trigger signal.

2. The detection and protection device according to claim 1, characterized in that: It also includes a test module, which includes a test switch, one end of which is connected to the second current-carrying line, and the other end of which is connected to a connection point between the second self-test unit and the second shielding conductor structure.

3. The detection and protection device according to claim 1, characterized in that: The first self-test unit includes a first resistor and a second resistor, the first resistor is connected between the first current-carrying line and the first end, and the second resistor is connected between the first current-carrying line and the second end.

4. The detection and protection device according to claim 3, characterized in that: The fault response module includes a third resistor, a fourth resistor and a first switch tube, the third resistor and the fourth resistor are connected in series between the first current-carrying line and the second current-carrying line, the connection point between the third resistor and the fourth resistor is connected to the control pin of the first switch tube, one switch pin of the first switch tube is connected to the first end and the second end, and the other switch pin is connected to the trigger module.

5. The detection and protection device according to claim 4, characterized in that: It also includes a first unidirectional conduction module, which includes a first diode and a second diode, the first end is connected to the anode of the first diode, the second end is connected to the anode of the second diode, and the cathode of the first diode and the cathode of the second diode are both connected to a switch pin of the first switch tube.

6. The detection and protection device according to claim 2, characterized in that: The second self-test unit includes a fifth resistor and a sixth resistor, the fifth resistor is connected between the second current-carrying line and the fourth end, and the sixth resistor is connected between the second current-carrying line and the fifth end.

7. The detection and protection device according to claim 6, characterized in that: It also includes a second unidirectional conduction module, which includes a third diode and a fourth diode. The test module also includes a seventh resistor. The other end of the test switch is connected to one end of the seventh resistor, and the other end of the seventh resistor is connected to the anode of the third diode and the anode of the fourth diode. The cathode of the third diode is connected to the fourth end, and the cathode of the fourth diode is connected to the fifth end.

8. The detection and protection device according to claim 1, characterized in that: The trigger module also includes a thyristor and a trip coil for generating electromagnetic force to drive the switch module to disconnect the power connection, the first current-carrying line is connected to one end of the trip coil, the other end of the trip coil is connected to the anode of the thyristor, the cathode of the thyristor is connected to the second current-carrying line, and the control electrode of the thyristor is connected to the output end of the fault response module.

9. The detection and protection device according to claim 8, characterized in that: The trigger module also includes a fifth diode and a sixth diode, the cathode of the thyristor is connected to the anode of the fifth diode and the anode of the sixth diode, the cathode of the fifth diode is connected to the second current-carrying line, and the cathode of the sixth diode is connected to the connection point between the trip coil and the thyristor.

10. The detection and protection device according to claim 9, characterized in that: The trigger module also includes a thyristor driving module, which includes an eighth resistor, a ninth resistor and a first capacitor. The output end of the fault response module is connected to one end of the eighth resistor, and the other end of the eighth resistor is respectively connected to one end of the ninth resistor, one end of the first capacitor and the control electrode of the thyristor. The other end of the ninth resistor and the other end of the first capacitor are both connected to the connection point between the thyristor and the fifth diode.

11. The detection and protection device according to claim 8, characterized in that: The trigger module further includes a first varistor connected in parallel with the thyristor.

12. The detection and protection device according to claim 8, characterized in that: It also includes an indication module connected in parallel with the thyristor, and the indication module includes a tenth resistor and a light emitting diode connected in series.

13. The detection and protection device according to claim 1, characterized in that: It also includes a lightning protection module, which includes a second varistor, and two ends of the second varistor are respectively connected to the first current-carrying line and the second current-carrying line.

14. An electrical connection device, characterized in that: It comprises the detection and protection device according to any one of claims 1 to 13, a shell and the power cord, the power cord is connected to the shell, and the switch module, the self-test path module, the fault response module and the trigger module are arranged in the shell.

15. An electrical equipment, characterized in that: The device comprises a load device and the electrical connection device according to claim 14, wherein the output end of the power line is connected to the load device.

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