CN213636499U

CN213636499U - Leakage protection plug and test socket capable of testing ground resistance

Info

Publication number: CN213636499U
Application number: CN202022423873.7U
Authority: CN
Inventors: 郭兰旺; 曾昭立
Original assignee: Zhongshan Rifeng Intelligent Electric Co ltd
Current assignee: Zhongshan Rifeng Intelligent Electric Co ltd
Priority date: 2020-10-27
Filing date: 2020-10-27
Publication date: 2021-07-06
Anticipated expiration: 2030-10-27

Abstract

The utility model discloses a testable ground resistance's earth leakage protection plug, including first casing, be equipped with the test structure of being connected with the ground wire electricity of output on the first casing, test structure part stretches out first casing and is connected rather than the electricity with the outside test equipment. The utility model also discloses a can supply earth leakage protection plug to insert the test socket with the ground resistance of test load electrical apparatus, including the second casing, be equipped with on the second casing and be connected electrically conductive structure with outside test equipment electricity, electrically conductive structure stretches out the second casing from inside to outside and can be connected with the test structure electricity. The utility model discloses need not to break when testing ground resistance and tear electric leakage protection plug or output electric wire open, guarantee the structural integrity of electric leakage protection plug or output electric wire when electrical apparatus dispatches from the factory, very big simplification test procedure, improved the production packaging efficiency of electrical apparatus.

Description

Leakage protection plug and test socket capable of testing ground resistance

[ technical field ]

The utility model relates to a testable ground resistance's earth leakage protection plug and test socket.

[ background art ]

The leakage protection plug has wide application, and can be used for leakage protection of electrical appliances such as electric heating tables, water storage type water heaters, electric hair dryer and the like. The existing leakage protection plug can disconnect three pins of the existing leakage protection plug from a corresponding output end live wire, a zero line and a ground wire when a power supply is not switched on or leakage occurs, has high safety performance, and can avoid damage to a load electric appliance and reduce safety accidents. When an electric appliance is produced and assembled, after the leakage protection plug is installed on the electric appliance, the grounding resistance of the electric appliance needs to be tested under the condition of no electricity, which is a necessary product quality inspection process. Because the ground wire of the earth leakage protection plug is inserted and disconnected with the output end ground wire, the earth leakage protection plug or the output end wire is broken and disassembled, and then the external test equipment can measure the ground resistance of the electric appliance, so that the production and assembly efficiency of the electric appliance is greatly reduced, and the structure of the earth leakage protection plug or the output end wire can be damaged after the earth leakage protection plug or the output end wire is broken and disassembled, thereby bringing great potential safety hazards to the use of terminal consumers.

The utility model discloses it is based on above problem produces.

[ contents of utility model ]

The utility model aims at the not enough of prior art, provide a testable ground resistance's earth leakage protection plug and test socket, the utility model discloses simple structure need not to break when testing electrical apparatus's ground resistance and tears earth leakage protection plug or output electric wire open, guarantees the structural integrity of electrical apparatus when dispatching from the factory earth leakage protection plug or output electric wire, very big simplification test procedure, improved the production packaging efficiency of electrical apparatus.

In order to solve the technical problem, the utility model discloses the technical scheme who adopts is:

a leakage protection plug capable of testing ground resistance comprises a first shell, wherein a circuit board, a live wire pin, a zero wire pin and a ground wire pin are arranged on the first shell, the circuit board is respectively and electrically connected with the live wire pin, the zero wire pin and the ground wire pin, a cross arm is hinged in the first shell, a live wire movable elastic sheet, a zero wire movable elastic sheet and a ground wire movable elastic sheet are respectively arranged on the cross arm, the live wire movable elastic sheet, the zero wire movable elastic sheet and the ground wire movable elastic sheet are respectively and electrically connected with a live wire, a zero wire and a ground wire corresponding to output ends, a reset spring capable of driving the cross arm to reset and rotate so as to enable the live wire movable elastic sheet, the zero wire movable elastic sheet and the ground wire movable elastic sheet to be separated from the live wire, the zero wire pin and the ground wire pin is arranged between the first shell and the cross arm, and a reset spring capable of driving the cross arm, The ground wire movable elastic sheet respectively supports and presses the lock arms of the live wire pin, the zero wire pin and the ground wire pin, a driving mechanism used for driving the lock arms to rotate so as to drive the cross arm to rotate is further arranged in the first shell, the driving mechanism is electrically connected with the circuit board, a test structure electrically connected with the ground wire of the output end is arranged on the first shell, and the test structure partially extends out of the first shell so as to supply external test equipment to be electrically connected with the test structure.

According to the leakage protection plug capable of testing the ground resistance, the first shell is provided with the first through hole, and the test structure comprises the first conductor which penetrates through the first through hole and is electrically connected with the ground wire at the output end in the first shell.

According to the leakage protection plug capable of testing the ground resistance, the waterproof rubber cap is clamped between the first shell and the first electric conductor, and a first opening for external testing equipment to extend into and be electrically connected with the first electric conductor is formed in the cap head of the waterproof rubber cap.

The leakage protection plug capable of testing the ground resistance is characterized in that an inner shell is connected to the circuit board, a first installation cavity and a second installation cavity are formed in the inner shell, the lock arm is hinged in the first installation cavity, the driving mechanism is fixedly arranged in the second installation cavity, the driving mechanism is an electromagnet assembly, the output end of the electromagnet assembly extends into the first installation cavity and is connected with the lock arm, and the reset spring is arranged between the cross arm and the inner shell.

The leakage protection plug comprises a vertical opening part connected with the output end of the electromagnet assembly in a clamped mode, and a vertical connecting rod part mutually pressed with the output end of the electromagnet assembly, wherein the hinged position of the locking arm is located on a connecting part between the vertical opening part and the vertical connecting rod part.

According to the leakage protection plug capable of testing the ground resistance, the buffer spring is arranged between the vertical connecting rod portion and the output end of the electromagnet assembly, the circuit board is provided with the second opening, the power supply indication color plate penetrating through the second opening is arranged at the upper end of the vertical connecting rod portion, the power supply indication window is arranged above the second opening of the first shell, and the connecting portion is provided with the side arm used for jacking the cross arm.

The leakage protection plug capable of testing the ground resistance is characterized in that the first shell is respectively provided with a test power-off key and a reset power-on key, the test power-off key is used for switching off the power supply of the electromagnet assembly so as to enable the lock arm and the cross arm to reset and rotate in sequence when being pressed down, the reset power-on key is used for switching on the power supply of the electromagnet assembly so as to drive the lock arm and the cross arm to rotate in reverse direction in sequence when being pressed down, and the circuit board is provided with a first current transformer for detecting whether the output end zero line leaks electricity and a second current transformer for detecting whether the output end ground wire leaks electricity.

The utility model provides a test socket, can supply earth leakage protection plug to insert in order to test the ground resistance of load electrical apparatus, including the second casing, set up on the second casing and supply live wire to participate in, zero line to participate in, ground wire to participate in male jack, be equipped with on the second casing and be connected electrically conductive structure with outside test equipment electricity, electrically conductive structure stretches out the second casing from inside to outside and can be connected with the test structure electricity.

According to the test socket, the second shell is provided with the second through hole, and the conductive structure comprises the second conductor which extends out of the second through hole and is movably connected with the second shell.

The second shell comprises an upper second shell and a lower second shell, the second through hole is formed in the upper second shell, the second conductor comprises a lower cylinder and an upper cylinder, the lower cylinder is electrically connected with external testing equipment, the diameter of the lower cylinder is larger than that of the second through hole, a jacking spring is arranged between the lower cylinder and the lower second shell, the diameter of the upper cylinder is smaller than that of the second through hole, and part of the upper cylinder extends out of the second through hole.

Compared with the prior art, the beneficial effects of the utility model are that:

1. the utility model discloses set up test structure on earth leakage protection plug, test structure's the inner is connected with output ground wire electricity, outer tip stretches out first casing, so that the ground resistance of electrical apparatus is tested out with test structure electrical contact to outside test equipment under the condition of not switching on power, need not to break the structural integrity of earth leakage protection plug or output electric wire when guaranteeing that electrical apparatus dispatches from the factory, very big simplification test procedure, the production packaging efficiency of electrical apparatus has been improved.

2. The utility model discloses a test socket is connected with outside test equipment electricity, when testing electrical apparatus's ground resistance, only need to the earth leakage protection plug insert test socket can, test procedure is more convenient, operates simplyr, great improvement the production packaging efficiency of electrical apparatus.

[ description of the drawings ]

Fig. 1 is a perspective view of the present invention;

fig. 2 is a perspective view of the earth leakage protection plug;

FIG. 3 is an exploded view of FIG. 2;

FIG. 4 is one of the internal structure diagrams of the earth leakage protection plug;

FIG. 5 is a second internal structure diagram of the earth leakage protection plug;

FIG. 6 is a third internal structure diagram of the earth leakage protection plug;

FIG. 7 is a perspective view of a test socket;

fig. 8 is an exploded view of fig. 7.

[ detailed description of the invention ]

This section will describe in detail the embodiments of the present invention, preferred embodiments of the present invention are shown in the attached drawings, which are used to supplement the description of the text part of the specification with figures, so that one can intuitively and vividly understand each technical feature and the whole technical solution of the present invention, but they cannot be understood as the limitation of the protection scope of the present invention.

As shown in fig. 1 to 6, a leakage protection plug capable of testing ground resistance comprises a first housing 10, the first housing 10 is provided with a circuit board 20, a live wire pin 21, a neutral wire pin 22, and a ground wire pin 23, the circuit board 20 is electrically connected to the live wire pin 21, the neutral wire pin 22, and the ground wire pin 23, the first housing 10 is hinged with a cross arm 30, the cross arm 30 is provided with a live wire moving spring 31, a neutral wire moving spring 32, and a ground wire moving spring 33, the live wire moving spring 31, the neutral wire moving spring 32, and the ground wire moving spring 33 are electrically connected to the live wire, the neutral wire, and the ground wire corresponding to the output ends, respectively, a reset spring 34 capable of driving the cross arm 30 to reset and rotate so that the live wire moving spring 31, the neutral wire moving spring 32, and the ground wire moving spring 33 are separated from the live wire pin 21, the neutral wire pin 22, and the ground wire pin 23, respectively, and a reset spring 34 capable of driving the cross arm 30 to rotate so that the live wire, The zero line moving elastic sheet 32 and the ground line moving elastic sheet 33 respectively press the lock arms 4 of the live wire pin 21, the zero line pin 22 and the ground wire pin 23, a driving mechanism 5 for driving the lock arms 4 to rotate so as to drive the cross arm 30 to rotate is further arranged in the first shell 10, the driving mechanism 5 is electrically connected with the circuit board 20, a test structure 6 electrically connected with the ground wire of the output end is arranged on the first shell 10, and part of the test structure 6 extends out of the first shell 10 so as to supply external test equipment to be electrically connected with the test structure.

When the leakage protection plug is not connected with a power supply or leakage occurs, the circuit board 20 disconnects the power supply of the driving mechanism 5, the output end of the driving mechanism 5 resets to push against the locking arm 4, the locking arm 4 resets to rotate to unlock the cross arm 30, the cross arm 30 resets to rotate under the driving of the reset spring 34, and at the moment, the live wire movable elastic sheet 31, the zero wire movable elastic sheet 32 and the ground wire movable elastic sheet 33 are respectively separated from the live wire pin 21, the zero wire pin 22 and the ground wire pin 23, so that the electric connection of the output end of the leakage protection plug is completely disconnected, the safety performance is high, the damage to a load electrical appliance can be avoided, and safety accidents are. When the leakage protection plug is connected with a power supply or the leakage accident is checked and the power supply is reset again, the circuit board 20 is connected with the power supply of the driving mechanism 5, the output end of the driving mechanism 5 drives the locking arm 4 to rotate reversely for a certain angle, the locking arm 4 drives the cross arm 30 to rotate reversely and lock the cross arm, and at the moment, the live wire movable elastic sheet 31, the zero wire movable elastic sheet 32 and the ground wire movable elastic sheet 33 respectively press the live wire pin 21, the zero wire pin 22 and the ground wire pin 23, so that the output end of the leakage protection plug is electrically connected with the input power supply, and the electric appliance is connected.

The inner end of the test structure 6 is electrically connected with the ground wire of the output end, the outer end part extends out of the first shell 10, so that the external test equipment is electrically contacted with the test structure 6 to test the ground resistance of the electric appliance without switching on a power supply, the leakage protection plug or the output end wire does not need to be broken and dismantled, the structural integrity of the leakage protection plug or the output end wire when the electric appliance leaves a factory is ensured, the test procedure is greatly simplified, and the production and assembly efficiency of the electric appliance is improved.

The first casing 10 is provided with a first through hole 11, and the test structure 6 includes a first conductor 61 penetrating the first through hole 11 and electrically connected to the ground line at the output end of the first casing 10.

Specifically, the inner end of the first conductor 61 is electrically connected with the ground wire of the output end, when the ground resistance is tested, the outer end of the first conductor 61 is electrically connected with external testing equipment, the leakage protection plug does not need to be broken and disassembled, and the operation is simpler and more convenient.

A waterproof rubber cap 62 is clamped between the first casing 10 and the first conductor 61, and a first opening 63 for external testing equipment to extend into and be electrically connected with the first conductor 61 is formed in a cap head of the waterproof rubber cap 62.

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

Be connected with inner shell 12 on the circuit board 20, seted up first installation cavity 13 and second installation cavity 14 on the inner shell 12, locking arm 4 articulates in first installation cavity 13, and actuating mechanism 5 sets firmly in second installation cavity 14, and actuating mechanism 5 is electromagnet assembly, and electromagnet assembly's output stretches into first installation cavity 13 and is connected with locking arm 4, and reset spring 34 is located between cross arm 30 and inner shell 12.

Specifically, the inner shell 12 enables the components to better realize close linkage work, and the moving armature of the electromagnet assembly is the power output end of the electromagnet assembly. The return spring 34 is specifically disposed between the lower end surface of the rear side extension of the inner housing 12 and the upper end surface of the cross arm 30, so as to better return the cross arm 30 to disconnect each of the moving spring pieces from the corresponding pin.

The locking arm 4 comprises a vertical opening portion 41 connected with the output end of the electromagnet assembly in a clamping mode and a vertical connecting rod portion 42 mutually pressed with the output end of the electromagnet assembly, and the hinged position of the locking arm 4 is located on a connecting portion 43 between the vertical opening portion 41 and the vertical connecting rod portion 42.

A buffer spring 44 is arranged between the vertical connecting rod part 42 and the output end of the electromagnet assembly.

When the output end of the electromagnet assembly presses the vertical connecting rod part 42, the buffer spring 44 can provide buffer force, so that the circuit board 20 is prevented from being damaged due to overlarge acting force of the vertical connecting rod part 42 impacting the circuit board 20.

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 indication color plate 45 passing through the second opening 24, and the first casing 10 is provided with a power indication window 15 above the second opening 24.

When the electromagnet assembly works in an attracting mode, the movable armature pulls the locking arm 4 to rotate backwards to enable the vertical connecting rod part 42 to rotate to the rear side of the second opening 24, and at the moment, the power supply indication color plate 45 at the upper end of the vertical connecting rod part 42 can be seen through the power supply indication window 15; when the electromagnet assembly does not work, the vertical connecting rod part 42 resets and rotates to the front side of the second opening 24, the power supply indicating window 15 is empty, the mechanical power supply indicating function is realized, and the power-on state of the plug is checked more visually.

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

The side arms 46 can better press the cross arm 30 to rotate, and can better drive the live wire movable spring piece 31, the zero wire movable spring piece 32 and the ground wire movable spring piece 33 which are fixed on the cross arm 30 to rotate to press and contact the corresponding pins.

The first shell 10 is respectively provided with a test power-off key 16 and a reset power-on key 17, when the test power-off key 16 is pressed, the circuit board 20 cuts off the power supply of the electromagnet assembly to enable the locking arm 4 and the cross arm 30 to reset and rotate in sequence, when the reset power-on key 17 is pressed, the circuit board 20 cuts on the power supply of the electromagnet assembly to drive the locking arm 4 and the cross arm 30 to rotate in reverse in sequence, and the circuit board 20 is provided with a first current transformer 25 for detecting whether the output end zero line leaks electricity and a second current transformer 26 for detecting whether the output end ground wire leaks electricity.

When the first current transformer 25 detects the leakage of the zero line of the output end and the second current transformer 26 detects the leakage of the ground wire of the output end, a leakage signal is sent to the circuit board 20, and at the moment, the circuit board 20 disconnects the power supply of the electromagnet assembly, so that the connection between the output end of the plug and the pins is disconnected, and the plug is powered off.

When no power supply is available in the original state, the electromagnet assembly does not work, the movable armature resets to press the locking arm 4 outwards, the locking arm 4 is pushed to rotate around the rotating shaft of the movable armature, the locking arm 4 releases the pressure on the cross arm 30, the cross arm 30 resets and rotates around the rotating shaft of the movable armature under the elastic force of the reset spring 34, the live wire movable elastic sheet 31, the zero wire movable elastic sheet 32 and the ground wire movable elastic sheet 33 which are fixed on the cross arm 30 are driven to reset and rotate to be separated from the live wire pin 21, the zero wire pin 22 and the ground wire pin 23 respectively, and at the moment, the leakage protection plug is automatically and actively in a disconnected state.

When the power supply is switched on and the voltage is normal, the electromagnet assembly works to attract the movable armature, the movable armature pulls the locking arm 4 to rotate reversely around the rotating shaft, so that the jacking cross arm 30 rotates reversely around the rotating shaft, the live wire movable elastic sheet 31, the zero line movable elastic sheet 32 and the ground wire movable elastic sheet 33 which are fixed on the cross arm 30 are driven to rotate reversely to respectively jack and contact the live wire pin 21, the zero line pin 22 and the ground wire pin 23, and the leakage protection plug outputs the power supply.

Therefore, after the power supply is switched on, when the voltage of the live wire of the power supply end is normal and the zero wire is disconnected or lost, a loop cannot be formed, the circuit board 20 is not electrified, the electromagnet assembly does not work in a power-off state, the live wire movable elastic sheet 31, the zero wire movable elastic sheet 32 and the ground wire movable elastic sheet 33 are respectively separated from the live wire pin 21, the zero wire pin 22 and the ground wire pin 23, and the plug is not switched on; meanwhile, the power supply is automatically switched on or off along with the existence of voltage at the power supply end, and manual reset is not needed.

The utility model discloses a leakage protection plug is after the disconnection under the power end zero line voltage is unusual, power end zero line is electrified, power end ground wire is electrified, output zero line is electrified, output ground wire is electrified etc. trouble condition, when switch on power supply and power voltage are normal again, need not artifical the resetting, but the automatic switch on power of leakage protection plug.

As shown in fig. 7 and 8, a test socket for inserting a leakage protection plug to test a ground resistance of a load electrical appliance includes a second housing 7, the second housing 7 is provided with a jack 70 for inserting a live pin 21, a neutral pin 22, and a ground pin 23, the second housing 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 housing 7 from inside to outside and can be electrically connected to the test structure 6.

The inner end of the conductive structure 8 is electrically connected with external test equipment, the outer end part extends out of the second shell 7, when the ground resistance of the electric appliance is tested, only a leakage protection plug is inserted into a test socket, and the test structure 6 is in mutual contact with the conductive structure 8, so that the external test equipment is electrically connected with the ground wire of the load electric appliance, the test procedure is more convenient, the operation is simpler, and the production and assembly efficiency of the electric appliance is greatly improved.

The second housing 7 is provided with 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.

The second housing 7 includes an upper second housing 72 and a lower second housing 73, a second through hole 71 is formed in the upper second housing 72, the second conductor 81 includes a lower cylinder 811 and an upper cylinder 812, the lower cylinder 811 is electrically connected to an external testing device and has a diameter larger than that of the second through hole 71, a pressing spring 82 is disposed between the lower cylinder 811 and the lower second housing 73, and the upper cylinder 812 has a diameter smaller than that of the second through hole 71 and partially extends out of the second through hole 71.

The second conductor 81 can be pressed to move up and down, and when the earth leakage protection plug is inserted into the test socket, the second conductor 81 presses against the first conductor 61 of the test structure 6, so that the electrical contact between the two conductors is good.

The above embodiments are merely preferred embodiments of the present invention, and the present invention may also have other embodiments, such as reasonable combinations of the technical solutions recorded in the embodiments. Equivalent modifications or substitutions may be made by those skilled in the art without departing from the spirit of the invention, and such equivalent modifications or substitutions are intended to be included within the scope of the claims set forth herein.

Claims

1. The utility model provides a ground resistance's earth leakage protection plug which can test which characterized in that: the power cable is characterized by comprising a first shell (10), wherein a circuit board (20), a live wire pin (21), a zero wire pin (22) and a ground wire pin (23) are arranged on the first shell (10), the circuit board (20) is electrically connected with the live wire pin (21), the zero wire pin (22) and the ground wire pin (23) respectively, a cross arm (30) is hinged in the first shell (10), a live wire movable elastic sheet (31), a zero wire movable elastic sheet (32) and a ground wire movable elastic sheet (33) are arranged on the cross arm (30) respectively, the live wire movable elastic sheet (31), the zero wire movable elastic sheet (32) and the ground wire movable elastic sheet (33) are electrically connected with a live wire, a zero wire and a ground wire corresponding to an output end respectively, and a power cable, a live wire and a ground wire are electrically connected with each other by the cross arm (30) which can be driven to reset and rotate so that the live wire movable elastic sheet (31), the zero wire movable elastic sheet (32, Reset spring (34) of zero line base pin (22), ground wire base pin (23), it has lock arm (4) that can drive cross arm (30) rotation so that live wire moves shell fragment (31), zero line moves shell fragment (32), ground wire moves shell fragment (33) roof pressure live wire base pin (21), zero line base pin (22), ground wire base pin (23) respectively to still articulate in first casing (10), still be equipped with in first casing (10) and be used for driving lock arm (4) and rotate in order to drive cross arm (30) pivoted actuating mechanism (5), actuating mechanism (5) are connected with circuit board (20) electricity, be equipped with on first casing (10) with the test structure (6) of the ground wire electricity connection of output, test structure (6) part stretches out first casing (10) and is connected with its electricity in order to supply outside test equipment.

2. A leakage protection plug capable of testing ground resistance according to claim 1, wherein: the first shell (10) is provided with a first through hole (11), and the test structure (6) comprises a first conductor (61) which penetrates through the first through hole (11) and is electrically connected with an output end ground wire in the first shell (10).

3. A leakage protection plug capable of testing ground resistance according to claim 2, wherein: a waterproof rubber cap (62) is clamped between the first shell (10) and the first conductor (61), and a first opening (63) for external test equipment to extend into and be electrically connected with the first conductor (61) is formed in the cap head of the waterproof rubber cap (62).

4. A leakage protection plug capable of testing ground resistance according to claim 1, 2 or 3, wherein: be connected with inner shell (12) on circuit board (20), first installation cavity (13) and second installation cavity (14) have been seted up on inner shell (12), load lock (4) articulate in first installation cavity (13), actuating mechanism (5) set firmly in second installation cavity (14), actuating mechanism (5) are electromagnet assembly, electromagnet assembly's output stretches into first installation cavity (13) and is connected with load lock (4), reset spring (34) are located between cross arm (30) and inner shell (12).

5. A leakage protection plug capable of testing ground resistance according to claim 4, wherein: the lock arm (4) comprises a vertical opening part (41) connected with the output end of the electromagnet assembly in a clamped mode and a vertical connecting rod part (42) pressed with the output end of the electromagnet assembly, and the hinged position of the lock arm (4) is located on a connecting part (43) between the vertical opening part (41) and the vertical connecting rod part (42).

6. A leakage protection plug capable of testing ground resistance according to claim 5, wherein: be equipped with buffer spring (44) between vertical connecting rod portion (42) and electromagnet assembly's the output, second opening (24) have been seted up on circuit board (20), the upper end of vertical connecting rod portion (42) is equipped with power indication color palette (45) that pass second opening (24), first casing (10) are located the top of second opening (24) and are equipped with power indication window (15), be equipped with side arm (46) that are used for roof pressure cross arm (30) on connecting portion (43).

7. A leakage protection plug capable of testing ground resistance according to claim 4, wherein: be equipped with test outage button (16) and reset circular telegram button (17) on first casing (10) respectively, circuit board (20) disconnection electro-magnet subassembly's power is so that locking arm (4) and cross arm (30) rotate in proper order when test outage button (16) is pressed, circuit board (20) switch on electro-magnet subassembly's power is in order to drive locking arm (4) and cross arm (30) reverse rotation in proper order when reset circular telegram button (17) are pressed, be equipped with first current transformer (25) that are used for detecting whether output zero line leaks electricity and be used for detecting second current transformer (26) that whether output ground wire leaks electricity on circuit board (20).

8. The utility model provides a test socket, can supply earth leakage protection plug to insert with the ground resistance of test load electrical apparatus which characterized in that: including second casing (7), offer on second casing (7) and supply live wire to participate in (21), zero line to participate in (22), ground wire to participate in (23) male jack (70), be equipped with on second casing (7) and be connected electrically conductive structure (8) with outside test equipment electricity, electrically conductive structure (8) stretch out second casing (7) from inside to outside and can be connected with test structure (6) electricity.

9. A test socket according to claim 8, wherein: the second shell (7) is provided with a second through hole (71), and the conductive structure (8) comprises a second conductor (81) which extends out of the second through hole (71) and is movably connected with the second shell (7).

10. A test socket according to claim 9, wherein: the second shell (7) comprises an upper second shell (72) and a lower second shell (73), a second through hole (71) is formed in the upper second shell (72), the second conductor (81) comprises a lower cylinder (811) and an upper cylinder (812), the lower cylinder (811) is electrically connected with external testing equipment, the diameter of the lower cylinder is larger than that of the second through hole (71), a jacking spring (82) is arranged between the lower cylinder (811) and the lower second shell (73), and the diameter of the upper cylinder (812) is smaller than that of the second through hole (71) and partially extends out of the second through hole (71).