A leakage protection plug and test socket capable of testing grounding resistance

Abstract

The present invention discloses a leakage protection plug capable of testing grounding resistance, comprising a first shell, on which a test structure electrically connected to a ground wire at an output end is disposed, and the test structure partially extends out of the first shell for an external test device to be electrically connected thereto. The present invention also discloses a test socket capable of being inserted with a leakage protection plug to test the grounding resistance of a load electrical appliance, comprising a second shell, on which a conductive structure electrically connected to an external test device is disposed, and the conductive structure extends out of the second shell from the inside to the outside and can be electrically connected to the test structure. The present invention does not require dismantling of the leakage protection plug or the output wire when testing grounding resistance, thereby ensuring the structural integrity of the leakage protection plug or the output wire when the electrical appliance leaves the factory, greatly simplifying the test process, and improving the production and assembly efficiency of the electrical appliance.

Description

[Technical field]

[0001] The invention relates to a leakage protection plug and a test socket capable of testing grounding resistance. [Background Technology]

[0002] Leakage protection plugs are widely used and can be used for leakage protection of electrical appliances such as electric heating tables, water storage water heaters, and hair dryers. The existing leakage protection plug can disconnect its three pins from the corresponding live wire, neutral wire, and ground wire at the output end when the power is not connected or leakage occurs. It has high safety performance and can avoid damage to load electrical appliances and reduce the occurrence of safety accidents. When producing and assembling electrical appliances, after the leakage protection plug is installed on the electrical appliance, it is necessary to test the grounding resistance of the electrical appliance without power, which is a necessary product quality inspection process. Since the ground wire pin of the leakage protection plug is disconnected from the ground wire at the output end, it is necessary to dismantle the leakage protection plug or the output wire to allow external testing equipment to measure the grounding resistance of the electrical appliance, which greatly reduces the production and assembly efficiency of the electrical appliance, and the structure of the leakage protection plug or the output wire may be damaged after dismantling, which brings great safety hazards to the end consumers.

[0003] The present invention is produced based on the above problems. [Summary of the invention]

[0004] The purpose of the present invention is to address the deficiencies in the prior art and to provide a leakage protection plug and a test socket capable of testing grounding resistance. The present invention has a simple structure and does not require the leakage protection plug or output terminal wires to be dismantled when testing the grounding resistance of an electrical appliance, thereby ensuring the structural integrity of the leakage protection plug or the output terminal wires when the electrical appliance leaves the factory, greatly simplifying the testing process and improving the production and assembly efficiency of the electrical appliance.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0006] A leakage protection plug capable of testing grounding resistance comprises a first shell, on which a circuit board, a live wire pin, a neutral wire pin and a ground wire pin are arranged, the circuit board is electrically connected to the live wire pin, the neutral wire pin and the ground wire pin respectively, a cross arm is hinged in the first shell, on which a live wire moving spring sheet, a neutral wire moving spring sheet and a ground wire moving spring sheet are arranged respectively, the live wire moving spring sheet, the neutral wire moving spring sheet and the ground wire moving spring sheet are electrically connected to the live wire, the neutral wire and the ground wire corresponding to the output end respectively, a device is provided between the first shell and the cross arm which can drive the cross arm to reset and rotate so that the live wire moving spring sheet, the neutral wire moving spring sheet and the ground wire moving spring sheet can be driven ... The movable spring piece and the ground movable spring piece are respectively separated from the reset springs of the live wire pin, the neutral wire pin and the ground wire pin. The first shell is also hinged with a lock shoulder that can drive the cross arm to rotate so that the live wire movable spring piece, the neutral wire movable spring piece and the ground wire movable spring piece can press the live wire pin, the neutral wire pin and the ground wire pin respectively. The first shell is also provided with a driving mechanism for driving the lock shoulder to rotate to drive the cross arm to rotate. The driving mechanism is electrically connected to the circuit board. The first shell is provided with a test structure electrically connected to the ground wire of the output end. The test structure partially extends out of the first shell for external testing equipment to be electrically connected to it.

[0007] In the leakage protection plug capable of testing grounding resistance as described above, the first shell is provided with a first through hole, and the testing structure includes a first conductor which penetrates into the first through hole and is electrically connected to the output end ground wire in the first shell.

[0008] In the leakage protection plug capable of testing grounding resistance as described above, a waterproof rubber cap is clamped between the first shell and the first conductor, and the cap head of the waterproof rubber cap is provided with a first opening for external testing equipment to extend into and electrically connect with the first conductor.

[0009] As described above, a leakage protection plug capable of testing grounding resistance is provided, wherein the circuit board is connected to an inner shell, the inner shell is provided with a first mounting cavity and a second mounting cavity, the locking arm is hinged in the first mounting cavity, the driving mechanism is fixed in the second mounting cavity, the driving mechanism is an electromagnet assembly, the output end of the electromagnet assembly extends into the first mounting cavity and is connected to the locking arm, and the reset spring is provided between the cross arm and the inner shell.

[0010] As described above, a leakage protection plug capable of testing grounding resistance, the locking shoulder comprises a vertical opening portion clamped with the output end of the electromagnet assembly, and a vertical connecting rod portion pressed against the output end of the electromagnet assembly, and the hinged position of the locking shoulder is located at the connecting portion between the vertical opening portion and the vertical connecting rod portion.

[0011] As described above, a leakage protection plug capable of testing grounding resistance is provided with a buffer spring between the vertical connecting rod portion and the output end of the electromagnet assembly, a second opening is provided on the circuit board, a power indicator color plate passing through the second opening is provided on the upper end of the vertical connecting rod portion, a power indicator window is provided on the first shell above the second opening, and a side arm for pressing the cross arm is provided on the connecting portion.

[0012] As described above, a leakage protection plug capable of testing grounding resistance is provided with a test power-off button and a reset power-on button respectively on the first shell. When the test power-off button is pressed, the circuit board disconnects the power supply of the electromagnet assembly to allow the lock arm and the cross arm to reset and rotate in sequence. When the reset power-on button is pressed, the circuit board connects the power supply of the electromagnet assembly to drive the lock arm and the cross arm to rotate in reverse in sequence. The circuit board is provided with a first current transformer for detecting whether the neutral line at the output end is leaking and a second current transformer for detecting whether the ground line at the output end is leaking.

[0013] A test socket, which can be inserted with a leakage protection plug to test the grounding resistance of a load electrical appliance, comprises a second shell, the second shell is provided with jacks for inserting a live wire pin, a neutral wire pin and a ground wire pin, the second shell is provided with a conductive structure electrically connected to an external test device, the conductive structure extends out of the second shell from the inside to the outside and can be electrically connected to the test structure.

[0014] In the test socket as described above, the second shell is provided with a second through hole, and the conductive structure includes a second conductor extending from the second through hole and movably connected to the second shell.

[0015] In a test socket as described above, the second shell includes an upper second shell and a lower second shell, the second through hole is opened on the upper second shell, the second conductor includes a lower cylinder and an upper cylinder, the lower cylinder is electrically connected to an external test device and its diameter is larger than the aperture of the second through hole, a pressure spring is provided between the lower cylinder and the lower second shell, and the diameter of the upper cylinder is smaller than the aperture of the second through hole and partially extends out of the second through hole.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The present invention sets a test structure on the leakage protection plug, the inner end of the test structure is electrically connected to the output end ground wire, and the outer end part extends out of the first shell, so that the external test equipment can be electrically contacted with the test structure to test the ground resistance of the electrical appliance when the power is not turned on, without dismantling the leakage protection plug or the output end wire, thereby ensuring the structural integrity of the leakage protection plug or the output end wire when the electrical appliance leaves the factory, greatly simplifying the test process and improving the production and assembly efficiency of the electrical appliance.

[0018] 2. The test socket of the present invention is electrically connected to an external test device. When testing the grounding resistance of an electrical appliance, it is only necessary to insert the leakage protection plug into the test socket. The test process is more convenient and the operation is simpler, which greatly improves the production and assembly efficiency of the electrical appliance. [Drawings]

[0019] Figure 1 is a stereogram of the present invention;

[0020] Figure 2 It is a three-dimensional diagram of a leakage protection plug;

[0021] Figure 3 yes Figure 2 Exploded diagram of

[0022] Figure 4 This is one of the internal structure diagrams of the leakage protection plug;

[0023] Figure 5 This is the second diagram of the internal structure of the leakage protection plug;

[0024] Figure 6 This is the third diagram of the internal structure of the leakage protection plug;

[0025] Figure 7 It is a three-dimensional picture of the test socket;

[0026] Figure 8 yes Figure 7 Exploded diagram of . [Specific implementation method]

[0027] 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 the overall technical solution of the present invention, but it cannot be understood as a limitation on the scope of protection of the present invention.

[0028] like Figures 1 to 6As shown, a leakage protection plug capable of testing grounding resistance comprises a first shell 10, on which a circuit board 20, a live wire pin 21, a neutral wire pin 22, and a ground wire pin 23 are arranged, the circuit board 20 is electrically connected to the live wire pin 21, the neutral wire pin 22, and the ground wire pin 23 respectively, a cross arm 30 is hinged in the first shell 10, on which a live wire moving spring piece 31, a neutral wire moving spring piece 32, and a ground wire moving spring piece 33 are respectively arranged, the live wire moving spring piece 31, the neutral wire moving spring piece 32, and the ground wire moving spring piece 33 are electrically connected to the live wire, the neutral wire, and the ground wire corresponding to the output end respectively, and a device capable of driving the cross arm 30 to reset and rotate so that the live wire moving spring piece 31, The neutral wire movable spring 32 and the ground wire movable spring 33 are respectively separated from the reset spring 34 of the live wire pin 21, the neutral wire pin 22 and the ground wire pin 23. The first shell 10 is also hinged with a lock shoulder 4 that can drive the cross arm 30 to rotate so that the live wire movable spring 31, the neutral wire movable spring 32 and the ground wire movable spring 33 can press the live wire pin 21, the neutral wire pin 22 and the ground wire pin 23 respectively. The first shell 10 is also provided with a driving mechanism 5 for driving the lock shoulder 4 to rotate so as to drive the cross arm 30 to rotate. The driving mechanism 5 is electrically connected to the circuit board 20. The first shell 10 is provided with a test structure 6 electrically connected to the ground wire at the output end. The test structure 6 partially extends out of the first shell 10 for external testing equipment to be electrically connected to it.

[0029] When the leakage protection plug is not connected to the power supply or leakage occurs, the circuit board 20 disconnects the power supply of the driving mechanism 5, and the output end of the driving mechanism 5 resets and presses the lock shoulder 4, and the lock shoulder 4 resets and rotates to unlock the cross arm 30. The cross arm 30 resets and rotates under the drive of the reset spring 34. At this time, the live wire moving spring piece 31, the neutral wire moving spring piece 32, and the ground wire moving spring piece 33 are respectively separated from the live wire pin 21, the neutral wire pin 22, and the ground wire pin 23, thereby completely disconnecting the electrical connection of the output end of the leakage protection plug, with high safety performance, which can avoid damage to the load electrical appliances and reduce the occurrence of safety accidents. When the leakage protection plug is connected to the power supply or the leakage accident is checked and the power is reset, the circuit board 20 is connected to the power supply of the driving mechanism 5, and the output end of the driving mechanism 5 drives the lock shoulder 4 to rotate in the opposite direction by a certain angle, and the lock shoulder 4 drives the cross arm 30 to rotate in the opposite direction and lock it. At this time, the live wire moving spring piece 31, the neutral wire moving spring piece 32, and the ground wire moving spring piece 33 respectively press the live wire pin 21, the neutral wire pin 22, and the ground wire pin 23, so that the output end of the leakage protection plug is electrically connected to the input power supply, and the electrical appliance is connected to the power supply.

[0030] The inner end of the test structure 6 is electrically connected to the output ground wire, and the outer end partially extends out of the first shell 10. When the power is not turned on, the external test equipment can be electrically contacted with the test structure 6 to test the ground resistance of the electrical appliance. There is no need to dismantle the leakage protection plug or the output wire, thereby ensuring the structural integrity of the leakage protection plug or the output wire when the electrical appliance leaves the factory, greatly simplifying the testing process and improving the production and assembly efficiency of the electrical appliance.

[0031] The first housing 10 defines a first through hole 11 , and the test structure 6 includes a first conductor 61 that penetrates the first through hole 11 and is electrically connected to the output terminal ground line in the first housing 10 .

[0032] Specifically, the inner end of the first conductor 61 is electrically connected to the output ground wire. When testing the grounding resistance, the outer end of the first conductor 61 is electrically connected to an external testing device without dismantling the leakage protection plug, which makes the operation simpler and more convenient.

[0033] A waterproof rubber cap 62 is clamped between the first housing 10 and the first conductor 61 . The cap head of the waterproof rubber cap 62 is provided with a first opening 63 for an external testing device to extend into and electrically connect to the first conductor 61 .

[0034] The waterproof rubber cap 62 can play a certain waterproof role, and can effectively prevent external water vapor from entering the leakage protection plug through the gap between the first shell 10 and the first conductor 61 to damage the internal circuit and structure.

[0035] The circuit board 20 is connected to the inner shell 12, and the inner shell 12 is provided with a first mounting cavity 13 and a second mounting cavity 14. The lock beam 4 is hinged in the first mounting cavity 13, and the drive mechanism 5 is fixed in the second mounting cavity 14. The drive mechanism 5 is an electromagnet assembly, and the output end of the electromagnet assembly extends into the first mounting cavity 13 and is connected to the lock beam 4. The reset spring 34 is arranged between the cross arm 30 and the inner shell 12.

[0036] Specifically, the inner shell 12 is used to better realize the close linkage between the components, and the movable armature of the electromagnet assembly is its power output end. The reset spring 34 is specifically arranged between the lower end surface of the rear side extension of the inner shell 12 and the upper end surface of the cross arm 30, so as to better reset the cross arm 30 and disconnect the connection between each movable spring piece and the corresponding pin.

[0037] The lock shoulder 4 includes a vertical opening portion 41 that is clamped with the output end of the electromagnet assembly and a vertical connecting rod portion 42 that presses against the output end of the electromagnet assembly. The hinge position of the lock shoulder 4 is located on the connecting portion 43 between the vertical opening portion 41 and the vertical connecting rod portion 42.

[0038] A buffer spring 44 is provided between the vertical connecting rod portion 42 and the output end of the electromagnet assembly.

[0039] When the output end of the electromagnet assembly presses the vertical connecting rod portion 42 , the buffer spring 44 can provide a buffer force to prevent the vertical connecting rod portion 42 from hitting the circuit board 20 with excessive force and damaging the circuit board 20 .

[0040] The circuit board 20 is provided with a second opening 24 , the upper end of the vertical connecting rod portion 42 is provided with a power indicator color plate 45 passing through the second opening 24 , and the first housing 10 is provided with a power indicator window 15 above the second opening 24 .

[0041] When the electromagnet assembly is engaged, the movable armature pulls the lock shoulder 4 to rotate backward, causing the vertical connecting rod portion 42 to rotate to the rear side of the second opening 24. At this time, the power indicator color plate 45 at the upper end of the vertical connecting rod portion 42 can be viewed through the power indicator window 15; when the electromagnet assembly is not working, the vertical connecting rod portion 42 is reset and rotated to the front side of the second opening 24, and the power indicator window 15 is empty, thereby realizing the mechanical power indication function and more intuitively viewing the power-on status of the plug.

[0042] The connecting portion 43 is provided with a side arm 46 for pressing the cross arm 30 .

[0043] The side arm 46 can better press the cross arm 30 to rotate, and can better drive the live wire moving spring piece 31, the neutral wire moving spring piece 32, and the ground wire moving spring piece 33 fixed on the cross arm 30 to rotate and press the corresponding pins.

[0044] A test power-off button 16 and a reset power-on button 17 are respectively provided on the first shell 10. When the test power-off button 16 is pressed, the circuit board 20 disconnects the power supply of the electromagnet assembly to allow the lock shoulder 4 and the cross arm 30 to reset and rotate in sequence. When the reset power-on button 17 is pressed, the circuit board 20 connects the power supply of the electromagnet assembly to drive the lock shoulder 4 and the cross arm 30 to rotate in the opposite direction in sequence. The circuit board 20 is provided with a first current transformer 25 for detecting whether the neutral line at the output end is leaking and a second current transformer 26 for detecting whether the ground line at the output end is leaking.

[0045] When the first current transformer 25 detects leakage of the output neutral line and the second current transformer 26 detects leakage of the output ground line, a leakage signal is sent to the circuit board 20. At this time, the circuit board 20 disconnects the power supply of the electromagnet assembly, thereby disconnecting the connection between the output end of the plug and the pin, and the plug is powered off.

[0046] In the original state without power supply, the electromagnet assembly does not work, the movable armature resets and presses the lock shoulder 4 outward, pushing the lock shoulder 4 to rotate around its axis, so that the lock shoulder 4 releases the pressure on the cross arm 30, so that the cross arm 30 is reset and rotated around its axis under the elastic force of the reset spring 34, driving the live wire movable spring piece 31, the neutral wire movable spring piece 32, and the ground wire movable spring piece 33 fixed on the cross arm 30 to reset and rotate and respectively disengage from the live wire pin 21, the neutral wire pin 22, and the ground wire pin 23. At this time, the leakage protection plug is automatically and actively in the disconnected state.

[0047] When the power is turned on and the voltage is normal, the electromagnet assembly works to attract the movable armature, and the movable armature pulls the lock arm 4 to rotate in the opposite direction around its rotation axis, thereby pressing the cross arm 30 to rotate in the opposite direction around its rotation axis, driving the live wire movable spring piece 31, the neutral wire movable spring piece 32, and the ground wire movable spring piece 33 fixed on the cross arm 30 to rotate in the opposite direction and press and contact the live wire pin 21, the neutral wire pin 22, and the ground wire pin 23 respectively. At this time, the leakage protection plug outputs power.

[0048] Therefore, after the power is turned on, when the live wire voltage at the power supply end is normal but the neutral wire is disconnected or missing, a loop cannot be formed, the circuit board 20 is not powered, the electromagnet assembly is in a power-off state and does not work, the live wire moving spring piece 31, the neutral wire moving spring piece 32, and the ground wire moving spring piece 33 are respectively separated from the live wire pin 21, the neutral wire pin 22, and the ground wire pin 23, and the plug is not connected to the power supply; at the same time, the power supply is automatically connected or disconnected according to whether there is voltage at the power supply end, and no manual reset is required.

[0049] After the leakage protection plug of the present invention is disconnected under fault conditions such as abnormal voltage of the zero and live wires at the power supply end, the neutral wire at the power supply end being energized, the ground wire at the power supply end being energized, the neutral wire at the output end being energized, and the ground wire at the output end being energized, when the power supply is reconnected and the power supply voltage is normal, there is no need for manual resetting, and the leakage protection plug can automatically connect the power supply.

[0050] like Figure 7 and Figure 8 As shown, a test socket can be inserted into a leakage protection plug to test the grounding resistance of a load electrical appliance, including a second shell 7, the second shell 7 is provided with a jack 70 for inserting a live wire pin 21, a neutral wire pin 22, and a ground wire pin 23, and the second shell 7 is provided with a conductive structure 8 electrically connected to an external test device, and the conductive structure 8 extends out of the second shell 7 from the inside to the outside and can be electrically connected to the test structure 6.

[0051] The inner end of the conductive structure 8 is electrically connected to an external test device, and the outer end portion extends out of the second shell 7. When testing the grounding resistance of the electrical appliance, it is only necessary to insert the leakage protection plug into the test socket, and the test structure 6 and the conductive structure 8 are in contact with each other, thereby realizing the electrical connection between the external test equipment and the ground wire of the load electrical appliance. The testing process is more convenient and the operation is simpler, which greatly improves the production and assembly efficiency of the electrical appliance.

[0052] The second housing 7 defines a second through hole 71 , and the conductive structure 8 includes a second conductor 81 extending from the second through hole 71 and movably connected to the second housing 7 .

[0053] The second shell 7 includes an upper second shell 72 and a lower second shell 73, the second through hole 71 is opened on the upper second shell 72, the second conductor 81 includes a lower cylinder 811 and an upper cylinder 812, the lower cylinder 811 is electrically connected to the external testing equipment and its diameter is larger than the aperture of the second through hole 71, a pressing spring 82 is provided between the lower cylinder 811 and the lower second shell 73, the diameter of the upper cylinder 812 is smaller than the aperture of the second through hole 71 and partially extends out of the second through hole 71.

[0054] The second conductor 81 can be pressed to rise and fall. When the leakage protection plug is inserted into the test socket, the second conductor 81 presses against the first conductor 61 of the test structure 6 , and the electrical contact between the two is good.

[0055] The above embodiments are only preferred embodiments of the present invention, and the present invention may also have other embodiments, such as reasonably combining the technical solutions recorded in multiple embodiments. Those skilled in the art may also make equivalent modifications or substitutions without violating the spirit of the present invention, and these equivalent modifications or substitutions are all included in the scope set by the claims of this application.

Claims

1. A leakage protection plug capable of testing grounding resistance, characterized in that: The invention comprises a first shell (10), on which a circuit board (20), a live wire pin (21), a neutral wire pin (22), and a ground wire pin (23) are provided, the circuit board (20) being electrically connected to the live wire pin (21), the neutral wire pin (22), and the ground wire pin (23) respectively, a cross arm (30) being hinged inside the first shell (10), on which a live wire movable spring sheet (31), a neutral wire movable spring sheet (32), and a ground wire movable spring sheet (33) are respectively provided, the live wire movable spring sheet (31), the neutral wire movable spring sheet (32), and the ground wire movable spring sheet (33) being electrically connected to the live wire, the neutral wire, and the ground wire corresponding to the output end respectively, and a spring element capable of driving the cross arm (30) to reset and rotate so that the live wire movable spring sheet (31), the neutral wire movable spring sheet (32), and the ground wire movable spring sheet (33) are respectively arranged between the first shell (10) and the cross arm (30) The line-moving spring (33) is respectively separated from the reset spring (34) of the live wire plug pin (21), the neutral wire plug pin (22), and the ground wire plug pin (23); the first housing (10) is also hinged with a lock beam (4) capable of driving the cross arm (30) to rotate so that the live wire moving spring (31), the neutral wire moving spring (32), and the ground wire moving spring (33) respectively press the live wire plug pin (21), the neutral wire plug pin (22), and the ground wire plug pin (23); the first housing (10) is also provided with a driving mechanism (5) for driving the lock beam (4) to rotate so as to drive the cross arm (30) to rotate; the driving mechanism (5) is electrically connected to the circuit board (20); the first housing (10) is provided with a test structure (6) electrically connected to the ground wire of the output end; the test structure (6) partially extends out of the first housing (10) so that an external test device can be electrically connected to it; The first shell (10) is provided with a first through hole (11), and the test structure (6) comprises a first conductor (61) which penetrates into the first through hole (11) and is electrically connected to the output end ground wire in the first shell (10); The circuit board (20) is connected to an inner shell (12), the inner shell (12) is provided with a first mounting cavity (13) and a second mounting cavity (14), the lock shoulder (4) is hinged in the first mounting cavity (13), the drive mechanism (5) is fixed in the second mounting cavity (14), the drive mechanism (5) is an electromagnet assembly, the output end of the electromagnet assembly extends into the first mounting cavity (13) and is connected to the lock shoulder (4), and the reset spring (34) is arranged between the cross arm (30) and the inner shell (12); The lock shoulder (4) comprises a vertical opening portion (41) engaged with the output end of the electromagnet assembly and a vertical connecting rod portion (42) pressed against the output end of the electromagnet assembly, and the hinged position of the lock shoulder (4) is located on the connecting portion (43) between the vertical opening portion (41) and the vertical connecting rod portion (42); The first housing (10) is provided with a test power-off button (16) and a reset power-on button (17).

2. The leakage protection plug capable of testing grounding resistance according to claim 1, characterized in that: A waterproof rubber cap (62) is clamped between the first shell (10) and the first conductor (61), and a cap head of the waterproof rubber cap (62) is provided with a first opening (63) for external testing equipment to extend into and electrically connect with the first conductor (61).

3. The leakage protection plug capable of testing grounding resistance according to claim 1, characterized in that: A buffer spring (44) is provided between the vertical connecting rod portion (42) and the output end of the electromagnet assembly, a second opening (24) is provided on the circuit board (20), a power indication color plate (45) passing through the second opening (24) is provided at the upper end of the vertical connecting rod portion (42), a power indication window (15) is provided on the first shell (10) above the second opening (24), and a side arm (46) for pressing the cross arm (30) is provided on the connecting portion (43).

4. The leakage protection plug capable of testing grounding resistance according to claim 1, characterized in that: When the test power-off button (16) is pressed, the circuit board (20) disconnects the power supply of the electromagnet assembly so that the lock arm (4) and the cross arm (30) are reset and rotated in sequence; when the reset power-on button (17) is pressed, the circuit board (20) connects the power supply of the electromagnet assembly so as to drive the lock arm (4) and the cross arm (30) to rotate in the opposite direction in sequence; and a first current transformer (25) for detecting whether the output end neutral line has leakage and a second current transformer (26) for detecting whether the output end ground line has leakage are provided on the circuit board (20).

5. A test socket, into which the leakage protection plug according to any one of claims 1 to 4 can be inserted to test the grounding resistance of a load electrical appliance, characterized in that: The device comprises a second shell (7), the second shell (7) being provided with a socket (70) for inserting a live wire pin (21), a neutral wire pin (22), and a ground wire pin (23), the second shell (7) being provided with a conductive structure (8) electrically connected to an external test device, the conductive structure (8) extending out of the second shell (7) from the inside to the outside and being capable of being electrically connected to a test structure (6); The second shell (7) is provided with a second through hole (71), and the conductive structure (8) comprises a second conductive body (81) extending from the second through hole (71) and movably connected to the second shell (7); The second shell (7) includes an upper second shell (72) and a lower second shell (73); the second through hole (71) is opened on the upper second shell (72); the second conductor (81) includes a lower column (811) and an upper column (812); the lower column (811) is electrically connected to an external test device and its diameter is larger than the aperture of the second through hole (71); a pressure spring (82) is provided between the lower column (811) and the lower second shell (73); the diameter of the upper column (812) is smaller than the aperture of the second through hole (71) and partially extends out of the second through hole (71).

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