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

Abstract

The utility model discloses a power line detection protection device, an electric connection device and an electric device, the detection protection device comprises a switch module, an electric leakage detection module, a fault response module, a trigger module, a self-checking current injection module and a manual detection module, the electric leakage detection module comprises a first shielding conductor structure and a second shielding conductor structure; the self-checking current injection module is used for generating a self-checking current flowing from the second shielding conductor structure to the first shielding conductor structure, and generating an open circuit signal flowing from the third end to the fault response module when the electric leakage detection module is in an open circuit; the manual detection module is used for generating simulated leakage current flowing from the first shielding conductor structure to the second shielding conductor structure; the simulated leakage current is greater than the self-test current. Automatic open-circuit detection and manual open-circuit detection of the shielding conductor structure in the electric leakage detection module can be realized at the same time.

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. When a certain leakage current is detected, a switch trips, disconnecting the appliance from the power supply and 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.

[0003] Currently, power line detection and protection devices typically perform open-circuit detection of the leakage current detection line after the device is powered on. Once an open circuit is detected in the leakage current detection line, a switch is triggered to trip, disconnecting the power supply. Furthermore, the device is typically equipped with a test switch to simulate a leakage condition and test whether the tripping mechanism is functioning properly. However, existing power line detection and protection devices cannot simultaneously perform both automatic and manual open-circuit detection of the leakage current detection line. Utility Model Content

[0004] The purpose of the present utility model 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 device, which can simultaneously realize automatic open circuit detection and manual open circuit detection of the shielded conductor structure in the leakage detection module, and can further distinguish between two different detection situations by detecting the current flowing through the leakage detection module.

[0005] 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 fault response module, a trigger module, a self-test current injection module, and a manual detection module, wherein:

[0006] The switch module is used to control the power connection between the input end and the output end of the power line;

[0007] 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 is connected to the second shielded conductor structure;

[0008] The fault response module is electrically coupled to the first shielded conductor structure and the second shielded conductor structure respectively, and outputs a trip trigger signal in response to obtaining the leakage signal;

[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] One end of the self-test current injection module is electrically coupled to the first current-carrying line, and the other end is electrically coupled to a connection point between the second shielded conductor structure and the fault response module, and is configured to generate a self-test current flowing from the second shielded conductor structure to the first shielded conductor structure under the action of a voltage provided by the first current-carrying line, and generate an open-circuit signal flowing from the second shielded conductor structure to the fault response module when the leakage detection module is open-circuited, so that the fault response module outputs the trip trigger signal;

[0011] The manual detection module has one end electrically coupled to the first current-carrying line and the other end electrically coupled to the connection point between the first shielded conductor structure and the fault response module, and is configured to generate a simulated leakage current flowing from the first shielded conductor structure to the second shielded conductor structure under the action of the voltage provided by the first current-carrying line, and output the simulated leakage current from the second shielded conductor structure to the fault response module, so that the fault response module outputs the trip trigger signal; wherein the simulated leakage current is greater than the self-test current.

[0012] The detection and protection device for the power line provided by the embodiment of the utility model has at least the following beneficial effects: after the switch module is closed and energized, since the two ends of the self-detection current injection module are respectively connected to the first current-carrying line and the second shielded conductor structure, a self-detection current is generated under the action of the voltage provided by the first current-carrying line, which flows from the self-detection current injection module to the second shielded conductor structure and then to the first shielded conductor structure. When an open circuit occurs in the leakage detection module, such as the first shielded conductor structure is open, the second shielded conductor structure is open, or the connecting line between the first shielded conductor structure and the second shielded conductor structure is open, the self-detection current cannot flow into the second shielded conductor structure and can only flow to the fault response module, thereby generating an open circuit signal flowing from the second shielded conductor structure to the fault response module, so that the fault response module outputs a tripping trigger signal, and the trigger module drives the switch module to disconnect the power connection; When performing manual detection, since the two ends of the manual detection module are respectively connected to the first current-carrying line and the first shielded conductor structure, under the action of the voltage provided by the first current-carrying line, a simulated leakage current is generated, which flows from the manual detection module to the first shielded conductor structure and then to the second shielded conductor structure. Since the simulated leakage current is greater than the self-detection current, it can offset the existing self-detection current, and finally flows from the second shielded conductor structure to the fault response module, so that the fault response module outputs a tripping trigger signal, and then the trigger module drives the switch module to disconnect the power connection; the detection and protection device can simultaneously realize the automatic detection and manual detection of the open circuit of the shielded conductor structure in the leakage detection module, and the direction and magnitude of the current flowing through the shielded conductor structure in the leakage detection module are different, so that the two different detection situations can be further distinguished by detecting the current flowing through the leakage detection module.

[0013] According to the detection and protection device provided in some embodiments of the present invention, the first shielding conductor structure includes a first end close to the input end of the power line and a second end close to the output end of the power line; the second shielding conductor structure includes a third end close to the input end and a fourth end close to the output end; the second end and the fourth end are connected; and the fault response module is respectively connected to the first end and the third end.

[0014] According to the detection and protection device provided in some embodiments of the present invention, the manual detection module includes a test switch and a first resistor, one end of the test switch is connected to the first current-carrying line, the other end of the test switch is connected to one end of the first resistor, and the other end of the first resistor is connected to the first end.

[0015] According to the detection and protection device provided in some embodiments of the present invention, the self-test current injection module includes a second resistor, one end of the second resistor is connected to the first current-carrying line, the other end of the second resistor is connected to the third end, and the resistance of the second resistor is greater than the resistance of the first resistor.

[0016] 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, a first capacitor and a Zener diode, one end of the third resistor is connected to the first end, one end of the fourth resistor is connected to the third end, the two ends of the first capacitor are respectively connected to the other end of the third resistor and the other end of the fourth resistor, one end of the Zener diode is connected to the connection point between the first capacitor and the fourth resistor, and the other end of the Zener diode is connected to the trigger module to output the tripping trigger signal to the trigger module when the Zener diode reversely breaks down.

[0017] According to the detection and protection device provided by some embodiments of the present invention, the trigger module includes a thyristor and a trip coil for generating electromagnetic force to drive the switch module to disconnect the power connection, the second 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 first 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 thyristor driving module, the thyristor driving module includes a fifth resistor and a second capacitor, the output end of the fault response module is connected to one end of the fifth resistor, one end of the second capacitor and the control electrode of the thyristor, and the other end of the fifth resistor and the other end of the second capacitor are both connected to the cathode of the thyristor.

[0019] According to the detection and protection device provided in some embodiments of the present invention, the trigger module also includes a first diode and a second diode, the cathode of the thyristor is connected to the anode of the first diode and the anode of the second diode, the cathode of the first diode is connected to the first current-carrying line, and the cathode of the second diode is connected to the connection point between the trip coil and the thyristor.

[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 sixth 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 utility model 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 fault response module and the trigger module, the self-test current injection module and the manual detection 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 yes Figure 1 A schematic diagram of the flow direction of the self-test current of the detection and protection device of the illustrated embodiment;

[0030] Figure 3 yes Figure 1 A schematic diagram of the flow of an open-circuit signal of a detection protection device according to the embodiment shown;

[0031] Figure 4 yes Figure 1 A schematic diagram of the flow direction of a simulated leakage current of the detection protection device of the illustrated embodiment;

[0032] Figure 5 This is a circuit schematic diagram of the leakage detection module, self-test current injection module and manual detection module of the detection and protection device provided by the embodiment of the utility model;

[0033] Figure 6 yes Figure 5 A schematic diagram of the flow direction of the self-test current of the detection and protection device of the illustrated embodiment;

[0034] Figure 7 yes Figure 5 A schematic diagram of the flow of an open-circuit signal of a detection protection device according to the embodiment shown;

[0035] Figure 8 yes Figure 5 A schematic diagram of the flow direction of a simulated leakage current of the detection protection device of the illustrated embodiment;

[0036] Figure 9 This is a circuit diagram of a leakage detection module and a fault response module of a detection and protection device provided by an embodiment of the present utility model;

[0037] Figure 10 This is a circuit schematic diagram of the switch module, trigger module, indicator module and lightning protection module of the detection and protection device provided by the embodiment of the utility model;

[0038] Figure 11 It 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 that can detect leakage current in a power cord group through a leakage current detection line. When a certain leakage current is detected, the switch is triggered to trip, disconnecting the power connection of the appliance and ensuring safe use. In recent years, in addition to detecting leakage current in the power cord through the leakage current detection line, leakage current detection circuit breakers have also proposed higher safety detection requirements, such as the need to detect whether the leakage current detection line is open. Currently, in power cord detection and protection devices, the open circuit detection of the leakage current detection line is generally performed continuously after the detection and protection device is powered on. Once an open circuit is detected in the leakage current detection line, the switch is triggered to trip, disconnecting the power supply. In addition, the detection and protection device is generally equipped with a test switch to simulate leakage conditions to test whether the trip device is working properly. However, existing power cord detection and protection devices cannot simultaneously realize automatic open circuit detection and manual open circuit detection of the leakage current detection line.

[0044] Based on this, an 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 simultaneously realize automatic open circuit detection and manual open circuit detection of the shielded conductor structure in the leakage detection module, and can further distinguish between two different detection situations by detecting the current flowing through the leakage detection module.

[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 5 This is a circuit schematic diagram of the leakage detection module, self-test current injection module and manual detection module of the detection and protection device provided by the embodiment of the utility model; Figure 9 This is a circuit diagram of a leakage detection module and a fault response module of a detection and protection device provided by an embodiment of the present utility model; Figure 10This is a circuit diagram of the switch module, trigger module, indicator module and lightning protection module of the detection and protection device provided by the embodiment of the utility model. Figure 1 、 Figure 5 、 Figure 9 and Figure 10 The first embodiment of the present invention provides a detection and protection device for a power line, wherein:

[0047] The power line includes a first current-carrying line 110 and a second current-carrying line 120. It is understandable that when the power line supplies power to an electrical device using two-phase alternating current, it can be one of the following two situations: the first current-carrying line 110 is the live 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 alternating current, 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. Below, Figure 5 The illustrated case, that is, the case where the first current-carrying line 110 is the live line L and the second current-carrying line 120 is the neutral line N, 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 fault response module 230 , a trigger module 240 , a self-test current injection module 250 and a manual detection module 260 .

[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 10 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 is connected to the second shielded conductor structure 222, specifically, the first shielded conductor structure 221 includes a first end a close to the input end of the power line and a second end b close to the output end of the power line; the second shielded conductor structure 222 includes a third end c close to the input end and a fourth end d close to the output end; the second end b is connected to the fourth end d; it can be understood that the leakage The first shielded conductor structure 221 in the 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. The second shielded 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, the second end b of the first shielded conductor structure 221 close to the output end of the power line is connected to the fourth end d of the second shielded conductor structure 222 close to the output end of the power line, so that the first shielded conductor structure 221 and the second shielded conductor structure 222 form a series detection loop. The integrity of the first shielded conductor structure 221 and the second shielded conductor structure 222 can be detected by judging whether the current can flow through the series detection loop.

[0051] The fault response module 230 is electrically coupled to the first shielded conductor structure 221 and the second shielded conductor structure 222, respectively. Specifically, the fault response module 230 is connected to the first end a and the third end c, respectively, and outputs a trip trigger signal in response to obtaining a leakage signal.

[0052] The trigger module 240 is electrically coupled to the fault response module 230 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;

[0053] One end of the self-test current injection module 250 is electrically coupled to the first current-carrying line 110, and the other end is electrically coupled to the connection point between the second shielded conductor structure 222 and the fault response module 230, specifically, it can be connected to the third end c. The self-test current injection module 250 is configured to generate a self-test current flowing from the second shielded conductor structure 222 to the first shielded conductor structure 221 under the action of the voltage provided by the first current-carrying line 110, and generate an open circuit signal flowing from the third end c to the fault response module 230 when the leakage detection module 220 is open circuited, so that the fault response module 230 outputs a trip trigger signal;

[0054] The manual detection module 260 has one end electrically coupled to the first current-carrying line 110, and the other end electrically coupled to the connection point between the first shielded conductor structure 221 and the fault response module 230, specifically connected to the first end a, and is used to generate a simulated leakage current flowing from the first shielded conductor structure 221 to the second shielded conductor structure 222 under the action of the voltage provided by the first current-carrying line 110, and output the simulated leakage current from the third end c to the fault response module 230, so that the fault response module 230 outputs a trip trigger signal; wherein the simulated leakage current is greater than the self-test current.

[0055] According to the detection and protection device for the power line provided by the embodiment of the present invention, after the switch module 210 is closed and energized, since the two ends of the self-test current injection module 250 are respectively connected to the first current-carrying line 110 and the third end c of the second shielded conductor structure 222, a self-test current is generated from the self-test current injection module 250 to the second shielded conductor structure 222 and then to the first shielded conductor structure 221 under the action of the voltage provided by the first current-carrying line 110. The flow direction of the self-test current is referenced to FIG. Figure 2 As shown by the arrow in, when an open circuit occurs in the leakage detection module 220, for example, the first shielding conductor structure 221 is open, the second shielding conductor structure 222 is open, or the connection line between the second end b and the fourth end d is open, the self-test current cannot flow from the third end c of the second shielding conductor structure 222 into the second shielding conductor structure 222, and can only flow to the fault response module 230, thereby generating an open circuit signal flowing from the third end c to the fault response module 230. The flow direction of the open circuit signal is shown in FIG. Figure 3 As shown by the arrow in the figure, the fault response module 230 outputs a tripping trigger signal, and the trigger module 240 drives the switch module 210 to disconnect the power connection; when performing manual detection, since the two ends of the manual detection module 260 are respectively connected to the first current-carrying line 110 and the first end a of the first shielded conductor structure 221, a simulated leakage current is generated from the manual detection module 260 to the first shielded conductor structure 221 and then to the second shielded conductor structure 222 under the action of the voltage provided by the first current-carrying line 110, and since the simulated leakage current is greater than the self-detection current, it can offset the existing self-detection current and finally flow from the third end c to the fault response module 230. The flow direction of the simulated leakage current is shown in FIG. Figure 4 As shown by the arrow in , the fault response module 230 outputs a tripping trigger signal, and the trigger module 240 drives the switch module 210 to disconnect the power connection; the detection and protection device can simultaneously realize the automatic open circuit detection and manual open circuit detection of the shielded conductor structure in the leakage detection module 220, and the directions and magnitudes of the currents flowing through the shielded conductor structure in the leakage detection module 220 are different, so that the two different detection situations can be further distinguished by detecting the current flowing through the leakage detection module 220.

[0056] It should be noted that the detection and protection device with leakage detection and open circuit detection functions needs to be inspected to determine whether it meets the requirements of the national standard. After the detection and protection device of the power cord provided by the embodiment of the utility model is inspected, in order to verify the open circuit automatic detection and open circuit manual detection functions of the detection and protection device, ammeters can be set at different positions to detect the size of the current signal flowing through the leakage detection module 220, and to detect the size of the current signal flowing from the third end c of the second shielding conductor structure 222 to the fault response module 230; when the manual detection module 260 is not turned on and the leakage detection module 220 does not have an open circuit, a self-test current with a smaller current value can be detected. Figure 2 As shown, the current flows counterclockwise through the leakage detection module 220. It is understandable that at this time, current can also flow directly from the self-test current injection module 250 to the fault response module 230. When the manual detection module 260 is turned on and the leakage detection module 220 is not open, a simulated leakage current with a larger current value can be detected. Figure 4 As shown, the current flows clockwise through the leakage detection module 220 and flows from the third terminal c to the fault response module 230. Therefore, the automatic open circuit detection and manual open circuit detection functions of the protection device can be reflected by the detection of the current flowing through the leakage detection module 220.

[0057] Reference Figure 5 In the detection and protection device provided in some embodiments of the present invention, the manual detection module 260 includes a test switch TEST and a first resistor R1, one end of the test switch TEST is connected to the first current-carrying line 110, the other end of the test switch TEST is connected to one end of the first resistor R1, and the other end of the first resistor R1 is connected to the first end a.

[0058] In this embodiment, when performing manual detection, the test switch TEST is pressed to close the test switch TEST. Under the action of the voltage provided by the first current-carrying line 110, a simulated leakage current is generated, which flows through the test switch TEST, the first resistor R1, the first shielding conductor structure 221, the second shielding conductor structure 222, and finally flows from the third end c of the second shielding conductor structure 222 to the fault response module 230. The simulated leakage current is referred to as Figure 8 It can be understood that, when the test switch TEST is pressed, there may also be a current flowing directly from the connection point of the first resistor R1 and the first shielding conductor structure 221, ie, the first end a, to the fault response module 230.

[0059] Reference Figure 5In the detection and protection device provided in some embodiments of the present invention, the self-test current injection module 250 includes a second resistor R2, one end of the second resistor R2 is connected to the first current-carrying line 110, and the other end of the second resistor R2 is connected to the third end c, and the resistance of the second resistor R2 is greater than the resistance of the first resistor R1.

[0060] In this embodiment, since the two ends of the second resistor R2 are respectively connected to the first current-carrying line 110 and the third end c of the second shielded conductor structure 222, a self-test current is generated under the action of the voltage provided by the first current-carrying line 110, and flows through the second resistor R2, the second shielded conductor structure 222, the first shielded conductor structure 221, and finally flows from the first end a of the first shielded conductor structure 221 to the fault response module 230. The flow direction of the self-test current is shown in FIG. Figure 6 As shown by the arrow in, it can be understood that at this time, there may also be a current flowing directly from the connection point between the second resistor R2 and the second shielding conductor structure 222, that is, the third end c, to the fault response module 230; when an open circuit occurs in the leakage detection module 220, for example, the first shielding conductor structure 221 is open, the second shielding conductor structure 222 is open, or the connection line between the second end b and the fourth end d is open, the self-test current cannot flow from the third end c of the second shielding conductor structure 222 into the second shielding conductor structure 222, and can only flow to the fault response module 230, thereby generating an open circuit signal flowing from the third end c to the fault response module 230, and the flow direction of the open circuit signal refers to Figure 7 As shown by the arrow in , the fault response module 230 outputs a trip trigger signal, and then the trigger module 240 drives the switch module 210 to disconnect the power connection.

[0061] It should also be noted that since the second end b of the first shielded conductor structure 221 and the fourth end d of the second shielded conductor structure 222 are connected together, the first shielded conductor structure 221 and the second shielded conductor structure 222 are equipotential points; the resistance of the second resistor R2 is greater than the resistance of the first resistor R1, that is, the resistance of the second resistor R2 is larger, so the self-test current injected from the second resistor R2 to the second shielded conductor structure 222 is smaller, and the resistance of the first resistor R1 is smaller. When the test switch TEST is pressed, the leakage simulation current injected from the first resistor R1 to the first shielded conductor structure 221 is larger, thereby offsetting the existing self-test current, and finally flows from the third end c of the second shielded conductor structure 222 to the fault response module 230, so that the fault response module 230 outputs a tripping trigger signal, and then the trigger module 240 drives the switch module 210 to disconnect the power connection.

[0062] Reference Figure 9In the detection and protection device provided in some embodiments of the present invention, the fault response module 230 includes a third resistor R3, a fourth resistor R4, a first capacitor C1, and a Zener diode ZD1. One end of the third resistor R3 is connected to the first end a, one end of the fourth resistor R4 is connected to the third end c, two ends of the first capacitor C1 are respectively connected to the other end of the third resistor R3 and the other end of the fourth resistor R4, one end of the Zener diode ZD1 is connected to the connection point between the first capacitor C1 and the fourth resistor R4, and the other end of the Zener diode ZD1 is connected to the trigger module 240 to output a trip trigger signal to the trigger module 240 when the Zener diode ZD1 breaks down in reverse.

[0063] In this embodiment, when the following four situations occur, the Zener diode ZD1 will cause reverse breakdown, thereby outputting a tripping trigger signal to the trigger module 240: the first situation is that the first shielded conductor structure 221 detects a leakage signal from the first current-carrying line 110 and transmits it to the fault response module 230; the second situation is that the second shielded conductor structure 222 detects a leakage signal from the second current-carrying line 120 and transmits it to the fault response module 230; the third situation is that an open circuit occurs in the leakage detection module 220, for example, the first shielded conductor structure 221 is open, the second shielded conductor structure 222 is open, or the connecting line between the second end b and the fourth end d is open, generating an open circuit signal flowing from the third end c to the fault response module 230; the fourth situation is that the test switch TEST is manually detected and pressed, generating a simulated leakage current, and flowing from the third end c of the second shielded conductor structure 222 to the fault response module 230.

[0064] In addition, it should be noted that the connection point between the third resistor R3 and the first capacitor C1 is also connected to the trigger module 240 so as to form a complete current loop.

[0065] Reference Figure 10 In the detection and protection devices provided in some embodiments of the present invention, the trigger module 240 includes a thyristor Q1 and a trip coil Lx for generating electromagnetic force to drive the switch module 210 to disconnect the power connection. The second current-carrying line 120 is connected to one end of the trip coil Lx, and the other end of the trip coil Lx is connected to the anode of the thyristor Q1. The cathode of the thyristor Q1 is connected to the first current-carrying line 110. The control electrode of the thyristor Q1 is connected to the output end of the fault response module 230.

[0066] In this embodiment, when the output terminal of the fault response module 230 outputs a trip trigger signal to the control electrode of the thyristor Q1, the thyristor Q1 is turned on, forming a strong current path of the second current-carrying line 120-trip coil Lx-thyristor Q1-first diode D1-first current-carrying line 110; the trip coil Lx generates a strong electromagnetic force, thereby driving the switch module 210 to disconnect the power connection between the input and output terminals of the power line.

[0067] Reference Figure 10 In the detection and protection device provided in some embodiments of the present invention, the trigger module 240 further includes a thyristor driving module 241, the thyristor driving module 241 includes a fifth resistor R5 and a second capacitor C2, the output end of the fault response module 230 is connected to one end of the fifth resistor R5, one end of the second capacitor C2, and the control electrode of the thyristor Q1, and the other end of the fifth resistor R5 and the other end of the second capacitor C2 are both connected to the cathode of the thyristor Q1.

[0068] In this embodiment, when the fault response module 230 outputs a trip trigger signal, the trip trigger signal charges the second capacitor C2 via the fifth resistor R5, causing the potential of the control electrode of the thyristor Q1 to increase. When the AC power reaches the negative half-cycle, i.e., when the voltage level of the second current-carrying line 120 is greater than that of the first current-carrying line 110, the thyristor Q1 turns on, forming a strong current path from the second current-carrying line 120 to the trip coil Lx, the thyristor Q1, the first diode D1, and the first current-carrying line 110. The trip coil Lx generates a strong electromagnetic force, thereby driving the switch module 210 to disconnect the power connection between the input and output ends of the power line.

[0069] Reference Figure 10 In the detection and protection device provided in some embodiments of the present invention, the trigger module 240 further includes a first diode D1 and a second diode D2, the cathode of the thyristor Q1 is connected to the anode of the first diode D1 and the anode of the second diode D2, the cathode of the first diode D1 is connected to the first current-carrying line 110, and the cathode of the second diode D2 is connected to the connection point between the trip coil Lx and the thyristor Q1.

[0070] In this embodiment, the first diode D1 and the second diode D2 in the trigger module 240 can enable the current signal transmitted to the cathode of the thyristor Q1 to form a complete current loop and flow back to the first current-carrying line 110 or the second current-carrying line 120 .

[0071] Reference Figure 10 In some embodiments of the detection and protection devices provided herein, the trigger module 240 further includes a first varistor ZR1 connected in parallel with the thyristor Q1. 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 Q1 can protect the thyristor Q1 from damage.

[0072] Reference Figure 10In some embodiments of the present invention, the detection and protection device further includes an indication module 270 connected in parallel with the thyristor Q1. The indication module 270 includes a sixth resistor R6 and a light-emitting diode LED1 connected in series.

[0073] In this embodiment, after the switch module 210 is closed, a conduction path is formed: the second current-carrying line 120 - the tripping coil Lx - the sixth resistor R6 - the light-emitting diode LED1 - the first diode D1 - the first current-carrying line 110, and the light-emitting diode LED1 is lit; after the trigger module 240 drives the switch module 210 to disconnect the power connection, the light-emitting diode LED1 is turned off; the user can intuitively see the working status of the detection and protection device.

[0074] Reference Figure 10 In some embodiments of the present invention, the detection and protection device further includes 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.

[0075] 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 above in the first aspect of the embodiment, the power cord is connected to the shell 310, and the switch module 210, the fault response module 230 and the trigger module 240, the self-test current injection module 250 and the manual detection module 260 are arranged in the shell.

[0076] In addition, a third embodiment of the present invention provides an electrical device, including a load device and the electrical connection device 300 of the second embodiment, wherein the output end of the power line is connected to the load device.

[0077] 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 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 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 is connected to the second shielded conductor structure; a fault response module, electrically coupled to the first shielded conductor structure and the second shielded conductor structure, respectively, and outputting a trip trigger signal in response to acquiring the leakage signal; a trigger module, electrically coupled to the fault response module and the switch module, respectively, and configured to drive the switch module to disconnect the power connection in response to receiving the trip trigger signal; a self-test current injection module, one end of which is electrically coupled to the first current-carrying line, and the other end of which is electrically coupled to a connection point between the second shielded conductor structure and the fault response module, and configured to generate a self-test current flowing from the second shielded conductor structure to the first shielded conductor structure under the action of a voltage provided by the first current-carrying line, and to generate an open-circuit signal flowing from the second shielded conductor structure to the fault response module when the leakage detection module is open-circuited, so that the fault response module outputs the trip trigger signal; a manual detection module, one end of which is electrically coupled to the first current-carrying line, and the other end of which is electrically coupled to a connection point between the first shielded conductor structure and the fault response module, and configured to generate a simulated leakage current flowing from the first shielded conductor structure to the second shielded conductor structure under the action of a voltage provided by the first current-carrying line, and output the simulated leakage current from the second shielded conductor structure to the fault response module, so that the fault response module outputs the trip trigger signal; wherein the simulated leakage current is greater than the self-test current.

2. The detection and protection device according to claim 1, characterized in that: The first shielded conductor structure includes a first end close to the input end of the power line and a second end close to the output end of the power line; the second shielded conductor structure includes a third end close to the input end and a fourth end close to the output end; the second end and the fourth end are connected; and the fault response module is connected to the first end and the third end respectively.

3. The detection and protection device according to claim 2, characterized in that: The manual detection module includes a test switch and a first resistor, one end of the test switch is connected to the first current-carrying line, the other end of the test switch is connected to one end of the first resistor, and the other end of the first resistor is connected to the first end.

4. The detection and protection device according to claim 3, characterized in that: The self-test current injection module includes a second resistor, one end of the second resistor is connected to the first current-carrying line, the other end of the second resistor is connected to the third end, and the resistance of the second resistor is greater than the resistance of the first resistor.

5. The detection and protection device according to claim 2, characterized in that: The fault response module includes a third resistor, a fourth resistor, a first capacitor and a Zener diode, one end of the third resistor is connected to the first end, one end of the fourth resistor is connected to the third end, two ends of the first capacitor are respectively connected to the other end of the third resistor and the other end of the fourth resistor, one end of the Zener diode is connected to the connection point of the first capacitor and the fourth resistor, and the other end of the Zener diode is connected to the trigger module to output the trip trigger signal to the trigger module when the Zener diode reversely breaks down.

6. The detection and protection device according to claim 2, characterized in that: The trigger module includes a thyristor and a trip coil for generating electromagnetic force to drive the switch module to disconnect the power connection. The second 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 first current-carrying line, and the control electrode of the thyristor is connected to the output end of the fault response module.

7. The detection and protection device according to claim 6, characterized in that: The trigger module also includes a thyristor driving module, which includes a fifth resistor and a second capacitor. The output end of the fault response module is connected to one end of the fifth resistor, one end of the second capacitor, and the control electrode of the thyristor, and the other end of the fifth resistor and the other end of the second capacitor are both connected to the cathode of the thyristor.

8. The detection and protection device according to claim 6, characterized in that: The trigger module also includes a first diode and a second diode, the cathode of the thyristor is connected to the anode of the first diode and the anode of the second diode, the cathode of the first diode is connected to the first current-carrying line, and the cathode of the second diode is connected to the connection point between the trip coil and the thyristor.

9. The detection and protection device according to claim 6, characterized in that: The trigger module further includes a first varistor connected in parallel with the thyristor.

10. The detection and protection device according to claim 6, characterized in that: It also includes an indication module connected in parallel with the thyristor, and the indication module includes a sixth resistor and a light emitting diode connected in series.

11. 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.

12. An electrical connection device, characterized in that: It comprises the detection and protection device according to any one of claims 1 to 11, a shell and the power cord, the power cord is connected to the shell, and the switch module, the fault response module and the trigger module, the self-test current injection module and the manual detection module are arranged in the shell.

13. An electrical device, characterized in that: The device comprises a load device and the electrical connection device according to claim 12, wherein the output end of the power line is connected to the load device.

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