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

Abstract

The utility model 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 utility model relates to the field of electrical technology, in particular to a detection and protection device for a power line, an electrical connection device and an electrical device. Background Art

[0002] A leakage circuit detector interrupter (LCDI) is a power connection device for electrical appliances. It detects leakage current in the power cord through a leakage current detection line and, when a certain leakage current is detected, disconnects the appliance from the power supply, ensuring safe use. In recent years, leakage current detection circuit breakers have not only required leakage current detection through the leakage current detection line, but also have introduced higher safety detection requirements, such as the need to detect whether the leakage current detection line is open. Utility Model Content

[0003] The purpose 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 line, an electrical connection device and an electrical equipment, which can enrich the feasibility and flexibility of leakage detection and shielding structure open circuit detection of the power line, and is conducive to improving the power supply safety of the power line.

[0004] In a first aspect, an embodiment of the present invention provides a detection and protection device for a power line, wherein the power line includes a first current-carrying line and a second current-carrying line, and the detection and protection device includes: a switch module, a leakage detection module, a self-test path module, a fault response module, and a trigger module, wherein:

[0005] The switch module is used to control the power connection between the input end and the output end of the power line;

[0006] The leakage detection module includes 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 the leakage signal of the first current-carrying line, and the second shielded conductor structure is used to collect the leakage signal of the second current-carrying line; the first shielded conductor structure includes 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 shielded 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;

[0007] The self-test path module includes 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 shielded conductor structure, and the second self-test unit is electrically coupled between the second current-carrying line and the second shielded conductor structure, so that the electrically coupled first current-carrying line, the first self-test unit, the first shielded conductor structure, the second shielded conductor structure, the second self-test unit, and the second current-carrying line form an open circuit self-test path;

[0008] The fault response module is electrically coupled to a connection point between the first self-test unit and the first shielded conductor structure, and outputs a trip trigger signal in response to obtaining the leakage signal or obtaining an open circuit signal generated when the open circuit self-test path is open;

[0009] 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.

[0010] The detection and protection device for the power line provided by the embodiment of the utility model has at least the following beneficial effects: the first shielding conductor structure in the leakage detection module covers the first current-carrying line so that the leakage signal of the first current-carrying line can be collected, and the second shielding conductor structure in the leakage detection module covers the second current-carrying line so that the leakage signal of the second current-carrying line can be collected. On this basis, by connecting the third end in the middle of the first shielding conductor structure with the sixth end in the second shielding conductor structure, there is a connection 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 independent and separate. The first self-test unit and the second self-test unit cooperate with the first shielding conductor structure, the second shielding conductor structure, the first current-carrying line and the second current-carrying line to form an open circuit self-test path, which can perform open circuit detection on a variety of different detection paths, such as 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 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 a detection path from the second end to the third end, then to the sixth end of the second shielded conductor structure, and finally to the fourth end of the second shielded conductor structure; a detection path from the second end to the third end of the first shielded conductor structure, then to the sixth end of the second shielded conductor structure, and finally to the fifth end of the second shielded conductor structure; in addition, the fault response module is electrically coupled to the connection point between the first self-test unit and the first shielded conductor structure, and can obtain a leakage signal when there is no open circuit in the first shielded conductor structure and the second shielded conductor structure, and can also obtain an open circuit signal when an open circuit occurs in any detection path in the open circuit self-test path, thereby outputting 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 line, thereby ensuring the power supply safety of the power line; in the power line detection and protection device of this embodiment, the first shielded conductor structure and the second shielded conductor structure form a plurality of 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 leakage detection and shielding structure open circuit detection of the power line, and being conducive to improving the power supply safety of the power line.

[0011] According to some embodiments of the present invention, the detection and protection device provided further 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 is connected to the connection point between the second self-test unit and the second shielding conductor structure.

[0012] According to the detection and protection device provided in some embodiments of the present invention, 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.

[0013] According to the detection and protection device provided in 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 between the third resistor and the fourth resistor is connected to the control pin of the first switching tube, one switch pin of the first switching tube is connected to the first end and the second end, and the other switch pin is connected to the trigger module.

[0014] According to some embodiments of the present invention, the detection and protection device further includes a first unidirectional conduction module, which includes a first diode and a second diode, wherein 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.

[0015] According to the detection and protection device provided in some embodiments of the present invention, 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.

[0016] According to some embodiments of the present invention, the detection and protection device further includes a second unidirectional conduction module, the second unidirectional conduction module 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, 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.

[0017] According to the detection and protection device provided by some embodiments of the present invention, 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.

[0018] According to the detection and protection device provided by some embodiments of the present invention, 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.

[0019] According to the detection and protection device provided by some embodiments of the present invention, the trigger module also includes a thyristor driving module, the thyristor driving 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, and 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.

[0020] 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.

[0021] According to some embodiments of the present invention, the detection and protection device further 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.

[0022] According to some embodiments of the present invention, the detection and protection device further 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.

[0023] In the second aspect, an embodiment of the present invention provides an electrical connection device, comprising the detection and protection device, a shell and the power cord as described in the embodiment of the first aspect above, 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.

[0024] In a third aspect, an embodiment of the present invention provides an electrical device, comprising a load device and the electrical connection device as described in the embodiment of the second aspect above, wherein the output end of the power line is connected to the load device.

[0025] Other features and advantages of the present invention will be described in the following description, and in part will become apparent from the description, or understood by practicing the present invention. The objectives and other advantages of the present invention can be achieved and obtained through the structures particularly pointed out in the description, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings are used to provide a further understanding of the technical solution 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 solution of the present invention and do not constitute a limitation on the technical solution of the present invention.

[0027] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0028] Figure 1 This is a module principle block diagram of the detection and protection device provided by an embodiment of the utility model;

[0029] Figure 2 This is a circuit diagram of a detection and protection device provided by an embodiment of the present utility model;

[0030] Figure 3 This is a schematic diagram of the flow of leakage signals when leakage occurs in the first current-carrying line provided by an embodiment of the present utility model;

[0031] Figure 4 This is a schematic diagram of the flow of leakage signals when leakage occurs in the second current-carrying line provided by an embodiment of the present utility model;

[0032] Figure 5 This is a schematic diagram of open-circuit signal flow when an open circuit occurs in a portion between the first end and the third end of the first shielding conductor structure provided by an embodiment of the present invention;

[0033] Figure 6 This is a schematic diagram of open-circuit signal flow when an open circuit occurs in the portion between the second end and the third end of the first shielding conductor structure provided by an embodiment of the present invention;

[0034] Figure 7 This is a schematic diagram of an open-circuit signal flow when an open circuit occurs in a connecting conductor between the third end of the first shielding conductor structure and the sixth end of the second shielding conductor structure provided by an embodiment of the present invention;

[0035] Figure 8 This is a schematic diagram of open-circuit signal flow when an open circuit occurs in the portion between the fourth end and the sixth end of the second shielding conductor structure provided by an embodiment of the present utility model;

[0036] Figure 9 This is a schematic diagram of open-circuit signal flow when an open circuit occurs in the portion between the fifth end and the sixth end of the second shielding conductor structure provided by an embodiment of the present utility model;

[0037] Figure 10 This is a schematic diagram of the flow of a simulated leakage signal when the test switch provided by an embodiment of the present utility model is pressed;

[0038] Figure 11It is a structural diagram of the electrical connection device provided by an embodiment of the utility model. DETAILED DESCRIPTION

[0039] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and overall technical solution of the present invention, but it cannot be understood as a limitation on the scope of protection of the present invention.

[0040] In the description of the embodiments of the present invention, "several" means one or more, "more" means more than two, "greater than," "less than," and "exceed" are understood to exclude the number itself, and "above," "below," and "within" are understood to include the number itself. "At least one" means one or more, "at least one of the following" and similar expressions refer to any combination of these items, including any combination of single or plural items. If "first," "second," or the like is used in the description, it is only for the purpose of distinguishing technical features and is not to be understood as indicating or implying relative importance, or implicitly indicating the number of the indicated technical features, or implicitly indicating the order of the indicated technical features.

[0041] It should be noted that the terms "set," "install," and "connect" in the embodiments of the present invention should be interpreted broadly. Those skilled in the art can reasonably determine the specific meanings of these terms in the embodiments of the present invention based on the specific content of the technical solution. For example, the term "connect" can refer to mechanical connection, electrical connection, or communication; it can refer to direct connection or indirect connection through an intermediary.

[0042] 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.

[0043] A leakage circuit detector interrupter (LCDI) is a power connection device for electrical appliances. It detects leakage current in the power cord through a leakage current detection line and, when a certain leakage current is detected, disconnects the appliance from the power supply, ensuring safe use. In recent years, leakage current detection circuit breakers have not only required leakage current detection through the leakage current detection line, but also have introduced higher safety detection requirements, such as the need to detect whether the leakage current detection line is open.

[0044] Based on this, the embodiment of the utility model provides a detection and protection device for a power line, an electrical connection device and an electrical device, which can enrich the feasibility and flexibility of leakage detection and shielding structure open circuit detection of the power line, and is conducive to improving the power supply safety of the power line.

[0045] The following is a further description of the embodiments of the present invention with reference to the accompanying drawings.

[0046] Figure 1 This is a module principle block diagram of the detection and protection device provided by an embodiment of the utility model; Figure 2 This is a circuit diagram of the detection and protection device provided by the embodiment of the utility model. Figure 1 and Figure 2 A first aspect of the present invention provides a detection and protection device for a power line, wherein the power line includes a first current-carrying line 110 and a second current-carrying line 120 .

[0047] It is understandable that when the power line supplies power to an electrical device using two-phase AC power, it can be one of the following two situations: the first current-carrying line 110 is the live line L, and the second current-carrying line 120 is the neutral line N; the first current-carrying line 110 is the neutral line N, and the second current-carrying line 120 is the live line L. When the power line supplies power to an electrical device using three-phase AC power, it can be one of the following three situations: the first current-carrying line 110 is the live line L1, and the second current-carrying line 120 is the neutral line N; the first current-carrying line 110 is the neutral line N, and the second current-carrying line 120 is the live line L1; the first current-carrying line 110 is the live line L1, and the second current-carrying line 120 is the live line L2. Figure 2 The illustrated case, that is, the case where the first current-carrying line 110 is the neutral line N and the second current-carrying line 120 is the live line L, is taken as an example for explanation, and the other cases can be obtained similarly.

[0048] The detection and protection device includes: a switch module 210, a leakage detection module 220, a self-test path module 230, a fault response module 240 and a trigger module 250, wherein:

[0049] The switch module 210 is used to control the power connection between the input end and the output end of the power line; 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 terminal of the switch module 210 is closed, the power connection between the input end and the output end of the power line is conducted; when the switch terminal of the switch module 210 is opened, the power connection between the input end and the output end of the power line is disconnected.

[0050] The leakage detection module 220 includes a first shielded conductor structure 221 covering the first current-carrying line 110 and a second shielded conductor structure 222 covering the second current-carrying line 120; the first shielded conductor structure 221 is used to collect the leakage signal of the first current-carrying line 110, and the second shielded conductor structure 222 is used to collect the leakage signal of the second current-carrying line 120; the first shielded conductor structure 221 includes a first end a close to the input end of the power line, a second end b close to the output end of the power line, and a third end c located between the first end a and the second end b; the second shielded conductor structure 222 includes a fourth end d close to the input end, a fifth end e close to the output end, and a third end c located between the fourth end d and the fifth end e. The sixth end f; the third end c is connected to the sixth end f; 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 that the leakage signal of the first current-carrying line 110 can be collected, and the second shielding conductor structure 222 in the leakage detection module 220 covers the second current-carrying line 120 so that the leakage signal of the second current-carrying line 120 can be collected. 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 a connection 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 independent and separate.

[0051] 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 electrically coupled in sequence form an open circuit self-checking path; It can be understood that the first self-checking unit 231 and the second self-checking unit 232 cooperate with the open circuit self-checking path formed by 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, which can perform open circuit detection on a plurality of different detection paths, such as a 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; a 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; a 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; a 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.

[0052] The fault response module 240 is electrically coupled to the connection point of the first self-checking unit 231 and the first shielding conductor structure 221, and outputs a trip trigger signal in response to obtaining a leakage signal or an open circuit signal generated when the open circuit self-checking path is open;

[0053] 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 trip trigger signal.

[0054] According to the detection and protection device for the power line provided by the embodiment of the present invention, the fault response module 240 is electrically coupled to the connection point between the first self-test 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 an open circuit occurs in any detection path in the open circuit self-test path, thereby outputting 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 line, thereby ensuring the power supply safety of the power line; in the detection and protection device for the power line of this embodiment, the first shielding conductor structure 221 and the second shielding conductor structure 222 form a plurality of detection segments that can be combined, thereby constructing a shielding network with a variety of different detection paths, greatly enriching the feasibility and flexibility of leakage detection and shielding structure open circuit detection of the power line, and being conducive to improving the power supply safety of the power line.

[0055] Reference Figure 1 and Figure 2 In the detection and protection device provided in some embodiments of the present invention, a test module 260 is also included. 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-test unit 232 and the second shielding conductor structure 222.

[0056] 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 to be transmitted to the second shielding conductor structure 222, so as to test whether the leakage detection function of the detection protection device is intact.

[0057] It should also be noted that since the fault response module 240 is connected to the connection point between the first self-test unit 231 and the first shielded conductor structure 221, and the other end of the test switch TEST is connected to the connection point between the second self-test unit 232 and the second shielded conductor structure 222, the analog leakage signal generated when the test switch TEST is pressed first flows from the other end of the test switch TEST through the second shielded conductor structure 222, then flows through the sixth end f of the second shielded conductor structure 222 to the third end c of the first shielded conductor structure 221, then flows through the first shielded conductor structure 221, and finally reaches the fault response module 240. That is, the analog leakage signal has completely flowed through the leakage detection module 220, so that whether the first shielded conductor structure 221 and the second shielded conductor structure 222 are open circuited can be determined by whether the fault response module 240 receives the analog leakage signal after the test switch TEST is pressed.

[0058] Reference Figure 2 In the detection and protection device provided in some embodiments of the present invention, the first self-test 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.

[0059] In this embodiment, the first end a of the first shielded 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 shielded 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 shielded conductor structure 221 in the open circuit self-test path, so that under normal circumstances, the potential of the first shielded conductor structure 221 will not trigger the fault response module 240 to output a tripping trigger signal.

[0060] It should be noted that when the first shielding conductor structure 221 is not open, the first end a of the first shielding conductor structure 221 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 parallel.

[0061] Reference Figure 2 In the detection and protection device provided in some embodiments of the present invention, the second self-test 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.

[0062] 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-test 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 tripping trigger signal.

[0063] It should be noted that when the second shielding conductor structure 222 is not open, the fourth end d of the second shielding conductor structure 222 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 parallel.

[0064] 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 connecting lines between the third end c and the sixth end f, any point of the first shielding conductor structure 221 and any point of the second shielding conductor structure 222 are equipotential points. At this time, the potential of the first shielding conductor structure 221 and the second shielding conductor structure 222 is determined by the voltage divider ratio of the first parallel resistor and the second parallel resistor, wherein: the first parallel resistor is the resistance obtained by connecting the first resistor R1 and the second resistor R2 in parallel, and the second parallel resistor is the resistance obtained by connecting the fifth resistor R5 and the sixth resistor R6 in parallel.

[0065] Reference Figure 2 In the detection and protection devices 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 switch transistor 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 between the third resistor R3 and the fourth resistor R4 is connected to the control pin of the first switch transistor Q1. One switch pin of the first switch transistor Q1 is connected to the first end a and the second end b, and the other switch pin is connected to the trigger module 250. Specifically, the first switch transistor Q1 is a transistor Q1. The connection point between the third resistor R3 and the fourth resistor R4 is connected to the base of the transistor Q1. The emitter of the transistor Q1 is connected to the first end a and the second end b. The collector of the transistor Q1 is connected to the trigger module 250.

[0066] 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. A divided voltage is provided to the base of the transistor Q1 via the connection point between the third resistor R3 and the fourth resistor R4. When the emitter of the transistor Q1 receives a voltage greater than the divided voltage at the base, the emitter junction of the transistor Q1 is forward-biased and thus turns on, thereby outputting a trip trigger signal to the trigger module 250 via the collector of the transistor Q1.

[0067] Reference Figure 2 In some embodiments of the present invention, the detection and protection device further includes a first unidirectional conduction module 241, which 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 cathode of the first diode D1 and the cathode of the second diode D2 are both connected to a switch pin of the first switch tube Q1.

[0068] In this embodiment, the first diode D1 in the first unidirectional conduction module 241 can ensure that the leakage signal on the first shielding conductor structure 221 and the open circuit signal generated when the open circuit self-detection path is open can only be transmitted unidirectionally from the first end a to the emitter of the transistor Q1; similarly, the second diode D2 in the first unidirectional conduction module 241 can ensure that the leakage signal on the first shielding conductor structure 221 and the open circuit signal generated when the open circuit self-detection path is open can only be transmitted unidirectionally from the second end b to the emitter of the transistor Q1.

[0069] Reference Figure 2 In some embodiments of the present invention, the detection and protection device 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 also 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 anode of the third diode D3 and the anode of 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.

[0070] In this embodiment, the third diode D3 in the second unidirectional conduction module 261 can ensure that when the test switch TEST is pressed, the analog leakage signal from the second current-carrying line 120 can be transmitted unidirectionally to the fourth end d of the second shielding conductor structure 222 only through the seventh resistor R7; similarly, the fourth diode D4 in the second unidirectional conduction module 261 can ensure that when the test switch TEST is pressed, the analog leakage signal from the second current-carrying line 120 can be transmitted unidirectionally to the fifth end e of the second shielding conductor structure 222 only through the seventh resistor R7.

[0071] Reference Figure 2 In the detection and protection devices provided in some embodiments of the present invention, the trigger module 250 further includes a thyristor Q2 and a trip coil Lx for generating 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 trip coil Lx, the other end of the trip 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, and the control electrode of the thyristor Q2 is connected to the output end of the fault response module 240.

[0072] It should be noted that the first self-test unit 231 mentioned above 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, wherein 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, referring 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 end of the second resistor R2 used to connect to 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 between the first resistor R1 and the second resistor R2 is connected to the connection point between the trip coil Lx and the thyristor Q2. This arrangement can reduce the number of connection points drawn from the first current-carrying line 110.

[0073] Reference Figure 2 In the detection and protection devices 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 anode of the sixth diode D6. The cathode of the fifth diode D5 is connected to the second current-carrying line 120. The cathode of the sixth diode D6 is connected to the connection point between the trip coil Lx and the thyristor Q2.

[0074] It should be noted that the second self-test unit 232 mentioned above 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, wherein 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, and is connected together with one end of the sixth resistor R6 used to connect to the second current-carrying line 120, and then 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. This arrangement can reduce the number of connection points drawn from the second current-carrying line 120.

[0075] Reference Figure 2 In some embodiments of the present invention, the detection and protection device provided by the trigger module 250 further includes a thyristor driver module 251. The thyristor driver 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 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 end of the ninth resistor R9 and the other end of the first capacitor C1 are both connected to the connection point between the thyristor Q2 and the fifth diode D5. Furthermore, the thyristor driver module 251 further includes a second capacitor C2 connected in parallel with the first capacitor C1.

[0076] In this embodiment, when the first switch Q1 is turned on, the current signal flowing through the first switch Q1 passes through the eighth resistor R8 and charges the first capacitor C1 and the second capacitor C2. The potential of the control electrode of the thyristor Q2 increases. When the AC power reaches the negative half-cycle, that is, when the voltage level of the first current-carrying line 110 is greater than the voltage level of the second current-carrying line 120, the thyristor Q2 turns on, forming a strong current path from the first current-carrying line 110 to the trip coil Lx, the thyristor Q2, the fifth diode D5, and the 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 and output ends of the power line.

[0077] Reference Figure 2 In some embodiments of the detection and protection devices provided herein, the trigger module 250 further includes a first varistor ZR1 connected in parallel with the thyristor Q2. It is understood that a varistor is a resistor device with a nonlinear volt-ampere characteristic. It is primarily used to clamp voltage when a circuit is subjected to overvoltage, absorbing excess current to protect sensitive components. Therefore, the first varistor ZR1 connected in parallel with the thyristor Q2 can protect the thyristor Q2 from damage.

[0078] Reference Figure 2 In some embodiments of the present invention, the detection and protection device 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.

[0079] Reference Figure 2 In some embodiments of the present invention, the detection and protection devices further include a lightning protection module 280, which includes a second varistor ZR2, with its two ends connected to the first current-carrying line 110 and the second current-carrying line 120, respectively. It will be understood that a varistor is a resistor device with a nonlinear volt-ampere characteristic, primarily used to clamp voltage when a circuit is subjected to overvoltage, absorbing excess current to protect sensitive components. Therefore, providing the second varistor ZR2 between the first current-carrying line 110 and the second current-carrying line 120 can protect subsequent components in the detection and protection device from damage caused by lightning voltage.

[0080] Below, Figure 2 The embodiment shown introduces the operation of the detection protection device provided by the embodiment of the utility model under various leakage and open circuit conditions:

[0081] 1. When the leakage signal of the first current-carrying line 110 is transmitted to the first shielding conductor structure 221:

[0082] After the first shielding conductor structure 221 obtains the leakage signal, Figure 3As shown, on the one hand, the power is transmitted from the first end a through the first diode D1 to the emitter of the transistor Q1, and on the other hand, the power is transmitted from the second end b through the second diode D2 to the emitter of the transistor Q1, so that the transistor Q1 is turned on;

[0083] After the transistor Q1 is turned on, the leakage signal charges the first capacitor C1 and the second capacitor C2, and the voltage of the control electrode of the thyristor Q2 increases. When the AC power supply enters the negative half cycle, that is, when the voltage level of the first current-carrying line 110 is greater than the voltage level of the second current-carrying line 120, the thyristor Q2 is turned on, forming a strong current path from the first current-carrying line 110 to the tripping coil Lx, the thyristor Q2, the fifth diode D5, and the second current-carrying line 120.

[0084] 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.

[0085] 2. When the leakage signal of the second current-carrying line 120 is transmitted to the second shielding conductor structure 222:

[0086] After the second shielding conductor structure 222 obtains the leakage signal, Figure 4 As shown, the power is transmitted from the sixth end f to the third end c of the first shielding conductor structure 221, and on the one hand, is transmitted from the first end a through the first diode D1 to the emitter of the transistor Q1, and on the other hand, is transmitted from the second end b through the second diode D2 to the emitter of the transistor Q1, so that the transistor Q1 is turned on;

[0087] After the transistor Q1 is turned on, the leakage signal charges the first capacitor C1 and the second capacitor C2, and the voltage of the control electrode of the thyristor Q2 increases. When the AC power supply enters the negative half cycle, that is, when the voltage level of the first current-carrying line 110 is greater than the voltage level of the second current-carrying line 120, the thyristor Q2 is turned on, forming a strong current path from the first current-carrying line 110 to the tripping coil Lx, the thyristor Q2, the fifth diode D5, and the second current-carrying line 120.

[0088] 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.

[0089] 3. When the portion of the first shielding conductor structure 221 between the first end a and the third end c is open:

[0090] The first resistor R1 is no longer connected in parallel with the second resistor R2. When the negative half cycle of the AC power supply comes, that is, the level of the first current-carrying line 110 is greater than the level of the second current-carrying line 120, refer to Figure 5 As shown, it is equivalent to generating an open-circuit signal at the connection point between the first resistor R1 and the first diode D1, and transmitting the signal to the emitter of the transistor Q1 through the first diode D1, so that the transistor Q1 is turned on;

[0091] After the transistor Q1 is turned on, the open-circuit signal charges the first capacitor C1 and the second capacitor C2, and the voltage of the control electrode of the thyristor Q2 increases. When the AC power supply reaches the negative half cycle, that is, when the voltage level of the first current-carrying line 110 is greater than the voltage level of the second current-carrying line 120, the thyristor Q2 is turned on, forming a strong current path from the first current-carrying line 110 to the tripping coil Lx, the thyristor Q2, the fifth diode D5, and the second current-carrying line 120.

[0092] 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.

[0093] 4. When the portion of the first shielding conductor structure 221 between the second end b and the third end c is open:

[0094] The second resistor R2 is no longer connected in parallel with the first resistor R1. When the negative half cycle of the AC power supply comes, that is, the level of the first current-carrying line 110 is greater than the level of the second current-carrying line 120, refer to Figure 6 As shown, it is equivalent to generating an open-circuit signal at the connection point between the second resistor R2 and the second diode D2, and transmitting it to the emitter of the transistor Q1 through the second diode D2, so that the transistor Q1 is turned on;

[0095] After the transistor Q1 is turned on, the open-circuit signal charges the first capacitor C1 and the second capacitor C2, and the voltage of the control electrode of the thyristor Q2 increases. When the AC power supply reaches the negative half cycle, that is, when the voltage level of the first current-carrying line 110 is greater than the voltage level of the second current-carrying line 120, the thyristor Q2 is turned on, forming a strong current path from the first current-carrying line 110 to the tripping coil Lx, the thyristor Q2, the fifth diode D5, and the second current-carrying line 120.

[0096] 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.

[0097] 5. When the connecting conductor between the third terminal c and the sixth terminal f is open:

[0098] 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 the negative half cycle of the AC power supply occurs, that is, the level of the first current-carrying line 110 is greater than the level of the second current-carrying line 120, refer to Figure 7As shown, an open circuit signal is generated at the connection point of the first resistor R1 and the first diode D1, and is transmitted to the emitter of the transistor Q1 via the first diode D1, and an open circuit signal is generated at the connection point of the second resistor R2 and the second diode D2, and is transmitted to the emitter of the transistor Q1 via the second diode D2, so that the transistor Q1 is turned on;

[0099] After the transistor Q1 is turned on, the open circuit signal charges the first capacitor C1 and the second capacitor C2, and the voltage of the control electrode of the thyristor Q2 is raised. When the negative half cycle of the AC power supply arrives, 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 - the trip coil Lx - the thyristor Q2 - the fifth diode D5 - the second current-carrying line 120.

[0100] 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 supply line.

[0101] 6. When the second shielding conductor structure 222 is partially open between the fourth end d and the sixth end f:

[0102] The fifth resistor R5 is no longer connected in parallel with the sixth resistor R6, so that the voltage of the first end a, the second end b, the third end c of the first shielding conductor structure 221, and the fifth end e and the sixth end f of the second shielding conductor structure 222 is raised. Referring to Figure 8 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 to the emitter of the transistor Q1 via the first diode D1, and an open circuit signal is generated at the connection point of the second resistor R2 and the second diode D2, and is transmitted to the emitter of the transistor Q1 via the second diode D2, so that the transistor Q1 is turned on;

[0103] After the transistor Q1 is turned on, the open circuit signal charges the first capacitor C1 and the second capacitor C2, and the voltage of the control electrode of the thyristor Q2 is raised. When the negative half cycle of the AC power supply arrives, 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 - the trip coil Lx - the thyristor Q2 - the fifth diode D5 - the second current-carrying line 120.

[0104] 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 supply line.

[0105] 7. When the second shielding conductor structure 222 is partially open between the fifth end e and the sixth end f:

[0106] The sixth resistor R6 is no longer connected in parallel with the fifth resistor R5, so that the voltages of 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 are increased. Figure 9 As shown, it is equivalent to generating an open-circuit signal at the connection point of the first resistor R1 and the first diode D1, and transmitting it to the emitter of the transistor Q1 through the first diode D1, and generating an open-circuit signal at the connection point of the second resistor R2 and the second diode D2, and transmitting it to the emitter of the transistor Q1 through the second diode D2, so that the transistor Q1 is turned on;

[0107] After the transistor Q1 is turned on, the open-circuit signal charges the first capacitor C1 and the second capacitor C2, and the voltage of the control electrode of the thyristor Q2 increases. When the AC power supply reaches the negative half cycle, that is, when the voltage level of the first current-carrying line 110 is greater than the voltage level of the second current-carrying line 120, the thyristor Q2 is turned on, forming a strong current path from the first current-carrying line 110 to the tripping coil Lx, the thyristor Q2, the fifth diode D5, and the second current-carrying line 120.

[0108] 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.

[0109] 8. When the test switch TEST is pressed:

[0110] During the positive half cycle of the AC power supply, that is, when the voltage level of the second current-carrying line 120 is greater than that of the first current-carrying line 110, the analog 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 end d of the second shielded conductor structure 222 via the third diode D3, and then flows through the sixth end f of the second shielded conductor structure 222, the third end c and the first end a of the first shielded conductor structure 221, and the first diode D1 to reach the emitter of the transistor Q1. On the other hand, it is transmitted to the fifth end e of the second shielded conductor structure 222 via the fourth diode D4, and then flows through the sixth end f of the second shielded conductor structure 222, the third end c and the second end b of the first shielded conductor structure 221, and the second diode D2 to reach the emitter of the transistor Q1, causing the transistor Q1 to be turned on.

[0111] After the transistor Q1 is turned on, a conduction path is formed from the transistor Q1 - the eighth resistor R8 - the ninth resistor R9 - the sixth diode D6 - the trip coil Lx - the second current-carrying line 120. The simulated leakage signal charges the first capacitor C1 and the second capacitor C2, and the voltage of the control electrode of the thyristor Q2 increases.

[0112] When the AC power reaches the negative half cycle, that is, the voltage level of the first current-carrying line 110 is greater than the voltage 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 - tripping coil Lx - thyristor Q2 - fifth diode D5 - second current-carrying line 120;

[0113] 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.

[0114] 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 construct an open circuit self-detection path through the self-detection path module 230 in conjunction with the leakage detection module 220 and the current-carrying line, thereby realizing leakage detection of the power line and automatic open circuit detection of the shielding structure of the power line; it can also realize manual open circuit detection of the shielding structure of the power line 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 formed with multiple detection segments can be combined, so that a shielding network with multiple different detection paths can be constructed, which greatly enriches the feasibility and flexibility of leakage detection of the power line and open circuit detection of the shielding structure, and is conducive to improving the power supply safety of the power line.

[0115] Reference Figure 11 The second aspect of the present invention provides an electrical connection device 300, including a detection and protection device, a shell 310 and a power cord as described in the first aspect of the present invention. The power cord is connected to the shell 310, and the switch module 210, the self-test path module 230, the fault response module 240 and the trigger module 250 are arranged in the shell 310.

[0116] In addition, a third embodiment of the present invention provides an electrical device, including a load device and the electrical connection device 300 as described in the second embodiment above, wherein the output end of the power line is connected to the load device.

[0117] The embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the scope of knowledge possessed by ordinary technicians in the technical field 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 and protection device includes: a switch module, configured 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 a leakage signal of the first current-carrying line, and the second shielded conductor structure is used to collect a leakage signal of the second current-carrying line; the first shielded conductor structure includes a first end near the input end of the power line, a second end near the output end of the power line, and a third end located between the first and second ends; the second shielded conductor structure includes a fourth end near the input end, a fifth end near the output end, and a sixth end located between the fourth and fifth ends; the third end and the sixth end are connected; A self-test path module includes 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 shielded conductor structure, and the second self-test unit is electrically coupled between the second current-carrying line and the second shielded conductor structure, so that the electrically coupled first current-carrying line, the first self-test unit, the first shielded conductor structure, the second shielded 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-test 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-test 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: A test module is also included. 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 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 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 between the third resistor and the fourth resistor is connected to the control pin of the first switching tube, one switch pin of the first switching 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 device, 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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