Portable intelligent test power box

Abstract

The invention relates to a portable intelligent test power box, which belongs to the technical field of electric power test equipment, and comprises a box body, a power supply module is arranged in the box body, a wire inlet socket and a wire outlet socket are arranged at the front end of the box body, a knife switch is arranged above the box body, the grounding end of the knife switch is connected with a ground wire circuit, and the grounding end of the knife switch is connected with the ground wire circuit. An air switch is arranged between the wire outlet end of the knife switch and the wire outlet socket, a discharging rod is arranged on one side of the box body, a detection switch is arranged on one side of the discharging rod, a grounding lock is arranged between the discharging rod and the box body, and a knife lock and a travel switch are arranged at the grounding end of the knife switch. The travel switch is connected with the knife switch handle in an abutting mode. The device is compact in design and reasonable in structure, various circuit elements such as the power module, the knife switch and the air switch are integrated in the box body, so that the device is small in size, light in weight and convenient to carry and install, and the convenience of a field test is greatly improved.

Description

Technical Field

[0001] The invention belongs to the technical field of electric power test equipment, and in particular relates to a portable intelligent test power supply box. Background Art

[0002] There should be two power switches in series in the low-voltage circuit of the test device, and an automatic overload tripping device should be installed. According to the safety regulations of the State Grid Corporation and the technical specifications for temporary power safety at construction sites, electrical tests are required for substation equipment during power outages and maintenance. During electrical tests, it is necessary to power or discharge the electrical equipment. When the electrical equipment is powered, discharge testing cannot be performed through the grounding rod, and the electrical equipment cannot be powered on when the electrical equipment is grounded for maintenance or testing. Because the existing experimental power supply boxes solve the above problems mainly through preventive measures such as personnel supervision or hanging warning signs, it is difficult to prevent misoperation problems, which brings great safety risks to maintenance or experimental personnel. Therefore, it is urgent to develop a portable intelligent test power supply box with a locking function to effectively ensure the safety of test equipment and test personnel. Summary of the invention

[0003] The technical problem to be solved by the present invention is to overcome the deficiencies in the prior art and provide a portable intelligent test power supply box to solve the disadvantage of the inconvenience in use in the prior art.

[0004] To solve the above problems, the technical solution adopted by the present invention is: A portable intelligent test power box comprises a box body, wherein a power module is arranged in the box body, an input socket and an output socket are arranged at the front end of the box body, a knife switch is arranged above the box body, the input socket and the output socket are respectively connected to the input and output terminal circuits of the knife switch, the grounding end of the knife switch is connected to the ground circuit, an air switch is arranged between the output terminal of the knife switch and the output socket, the air switch is respectively connected to the knife switch and the output socket circuit, a discharge rod is arranged on one side of the box body, a detection switch is arranged on one side of the discharge rod, the detection switch is abutted and connected with the discharge rod, a grounding lock is arranged between the discharge rod and the box body, a knife lock and a travel switch are arranged at the grounding end of the knife switch, the travel switch is abutted and connected with the knife switch handle, and the knife lock and the travel switch are electrically connected to the grounding lock.

[0005] Furthermore, the box body is respectively provided with an opening indicator light, a closing indicator light, a closing relay, an opening relay, an intermediate relay, a knife switch lock relay, a grounding lock relay, a buzzer indicator and a loudspeaker; the two ends of the main circuit of the closing relay are respectively connected to the knife switch outlet terminal and the air switch, and the closing indicator light is connected to the normally open end of the closing relay and the power module; the main circuit of the opening relay is connected in series with the travel switch, and the opening indicator light is connected to the normally open end of the opening relay and the power module; the normally open end of the closing relay is connected in parallel with the normally open end of the intermediate relay and then connected in series with the main circuit and the power module of the intermediate relay respectively; the main circuit of the knife switch lock relay is connected in parallel with the buzzer indicator and then connected in series with the normally open end of the opening relay and the detection switch; the normally open end of the knife switch lock relay is connected to the knife switch lock and the power module; the main circuit of the grounding lock relay is connected in parallel with the loudspeaker and then connected to the normally open end of the intermediate relay and the normally closed end of the opening relay, and the normally open end of the grounding lock relay is connected to the grounding lock.

[0006] Furthermore, the box is provided with a thermometer and humidity meter, which is used to measure the ambient temperature and humidity. The box is provided with three sets of voltmeters, which are connected to the incoming terminal of the knife switch and are used to measure the incoming terminal voltage of the knife switch.

[0007] Furthermore, the incoming line socket and the outgoing line socket are both three-phase five-wire explosion-proof sockets.

[0008] Furthermore, the knife switch is a 4P double-throw knife switch.

[0009] Furthermore, four sets of universal wheels are fixedly arranged on the bottom of the box.

[0010] Furthermore, a spare socket is provided on the box body, the spare socket is connected to the outlet socket, and the spare socket is a single-phase five-hole socket.

[0011] Furthermore, the air switch has overload, short circuit and pressure loss protection functions.

[0012] Furthermore, the power module is a 24V battery pack.

[0013] The present invention also provides a technical solution for a portable intelligent test power box experimental method, comprising the following steps: Step s1, preparation step, connecting the incoming socket and the outgoing socket to the incoming terminal and the outgoing terminal of the knife switch respectively, connecting the grounding terminal of the knife switch to the ground wire, setting the travel switch on one side of the grounding terminal of the knife switch, connecting the closing relay to the outgoing terminal of the knife switch, and connecting the opening relay, the intermediate relay, the knife lock relay, and the ground lock relay to the power module respectively; Step s2, closing step, closing the knife switch to the outgoing line circuit end, closing the air switch, at this time, the closing relay is turned on, the closing indicator light is on, the intermediate relay and the grounding lock relay are turned on respectively, the grounding lock is locked, the speaker is in the on state and emits a warning sound, the grounding lock is used to lock the discharge rod, and the discharge rod cannot be taken out during the closing step; Step s3, grounding step, the air switch is opened, the knife switch is opened, the operating handle of the knife switch is opened to the grounding end, the operating handle is in contact with the travel switch, the travel switch is turned on, the opening relay is turned on, the opening indicator light is on, the grounding lock relay is disconnected, and the grounding lock is opened. At this time, the discharge rod can be taken out for discharge test; Step s4, a rod taking step, the grounding lock is opened, and the discharge rod can be taken out for grounding discharge. After the discharge rod is taken out, the detection switch detects that the discharge rod is taken out, at which time the detection switch is turned on, the knife switch lock relay and the buzzer indicator are turned on, and the knife switch lock is in a locked state. The knife switch lock is used to lock the knife switch, and the knife switch cannot be closed at this time; Step s5, the rod retracting step, after the ground discharge experiment, put the discharge rod back, the discharge rod abuts against the detection switch, the detection switch detects that the discharge rod is put back, at this time the detection switch is disconnected, the knife lock relay and the buzzer indicator are disconnected, the knife lock is in the open state, the knife switch is in the released state, and the knife switch can be closed.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention provides a portable intelligent experimental power box. The device of the present invention has a compact design and a reasonable structure. The box integrates a power module, a knife switch, an air switch and other circuit components, so that the device is small in size and light in weight, easy to carry and install, and greatly improves the convenience of on-site experiments.

[0015] 2. The present invention provides a portable intelligent test power supply box. A knife switch lock and a grounding lock are arranged in the device of the present invention. The knife switch lock is used to lock the knife switch, and the grounding lock is used to lock the discharge rod. Through mutual electrical locking, when the electrical equipment is grounded for maintenance, the knife switch lock is used to prohibit the electrical equipment from being switched on and powered on, thereby reducing the potential safety hazards that may occur during the test and improving the safety of the test.

[0016] 3. The present invention provides a portable intelligent experimental power supply box. The three-phase five-wire explosion-proof socket adopted in the present invention improves the application scope of the power supply box and meets the test requirements of different occasions. At the same time, the knife switch adopts a 4P double-throw knife switch, which improves the flexibility and reliability of power switching. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the device of the present invention; Figure 2This is a schematic diagram of the panel structure of the device of the present invention; Figure 3 This is the electrical schematic diagram of the main circuit of the device of the present invention; Figure 4 The figure is the electrical schematic diagram of the secondary circuit of the device of the present invention.

[0018] In the figure: 1. Box, 2. Power module, 3. Incoming socket, 4. Outgoing socket, 5. Knife switch, 6. Discharge rod, 7. Grounding lock, 8. Knife lock, 9. Travel switch, 10. Air switch, 11. Opening indicator light, 12. Closing indicator light, 13. Closing relay, 14. Opening relay, 15. Intermediate relay, 16. Knife lock relay, 17. Grounding lock relay, 19. Buzzer indicator, 20. Speaker, 21. Thermohygrometer, 22. Voltmeter, 23. Universal wheel, 24. Spare socket, 25. Detection switch. DETAILED DESCRIPTION

[0019] In the present disclosure, terms such as "upper", "lower", "left", "right", "front", "back", "vertical", "horizontal", "first", "second", "middle end" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are relational words determined only for the convenience of describing the structural relationships of the various parts or elements of the present disclosure, and do not specifically refer to any part or element in the present disclosure and should not be understood as limitations on the present disclosure.

[0020] The present invention is further described in detail below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by ordinary technicians in this field without making creative work are within the protection scope of the present invention.

[0021] like Figure 1 to Figure 4As shown, the present invention provides an embodiment of a portable intelligent test power box, including a box body 1, wherein a power module 2 is arranged in the box body 1, and the power module 2 is a battery pack, and the output voltage of the power module 2 is a battery pack module of 24 volts. The power module 2 provides power for the electrical components in the experimental power box. An incoming socket 3 and an outgoing socket 4 are provided at the front end of the box body 1, and a knife switch 5 is provided above the box body 1. The knife switch 5 is a double-throw knife switch. When in the closed state, the knife switch 5 connects the main circuit between the incoming socket 3 and the outgoing socket 4. When in the open state, when the grounding terminal is connected, the knife switch 5 disconnects the main circuit between the incoming socket 3 and the outgoing socket 4. At the same time, the knife switch 5 connects the main circuit of the outgoing socket 4 with the grounding wire. The incoming socket 3 and the outgoing socket 4 are respectively connected to the incoming and outgoing circuits of the knife switch 5, and the grounding terminal of the knife switch 5 is connected to the grounding circuit. An air switch 10 is provided between the outgoing terminal of the knife switch 5 and the outgoing socket 4. The air switch 10 provides overload, leakage, overvoltage and other protections for the main circuit. The air switch 10 is respectively connected to the knife switch 5 and the outlet socket 4. A discharge rod 6 is provided on one side of the box 1. A detection switch 25 is provided on one side of the discharge rod 6. The detection switch 25 is connected to the discharge rod 6. The detection switch 25 is arranged below the discharge rod 6. The detection switch 25 is used to detect the removal of the discharge rod 6. When the discharge rod is taken out, the detection switch 25 is turned on. When the discharge rod is put back, the detection switch 25 is turned off. In the embodiment of the present invention, the detection switch 25 can be a button switch, a pressure switch or a switch with other similar structures. A grounding lock 7 is provided between the discharge rod 6 and the box 1. A knife lock 8 and a travel switch 9 are provided at the grounding end of the knife switch 5. The travel switch 9 is connected to the handle of the knife switch 5. The knife lock 8 and the travel switch 9 are electrically connected to the grounding lock 7. A knife switch lock and a grounding lock are arranged in the device of the present invention. The knife switch lock is used to lock the knife switch, and the grounding lock is used to lock the discharge rod. Through mutual electrical locking, when the electrical equipment is grounded for maintenance, the knife switch lock is used to prohibit the electrical equipment from being switched on and powered on, thereby reducing the potential safety hazards that may occur during the test and improving the safety of the test.

[0022] The box body 1 is respectively provided with an opening indicator light 11, a closing indicator light 12, a closing relay 13, an opening relay 14, an intermediate relay 15, a knife lock relay 16, a ground lock relay 17, a buzzer indicator 19 and a speaker 20; the opening indicator light 11 and the closing indicator light 12 are respectively used to indicate the opening and closing of the main circuit of the power box. In the embodiment of the present invention, the opening indicator light 11 can use a red indicator light, and the closing indicator light 12 can use a green indicator light. Similarly, the opening indicator light 11 and the closing indicator light 12 can also use indicator lights of other colors, which are respectively used to alert the operator to the opening and closing status of the power box. The two ends of the main circuit of the closing relay 13 are respectively connected to the outlet end of the knife switch 5 and the air switch 10, the closing indicator light 12 is connected to the normally open end of the closing relay 13 and the power module 2, the main coil voltage of the closing relay 13 is 220 volts, the closing relay 13 is connected in the main circuit of the power box, the rated voltage of the closing indicator light 12 is 24 volts, and the voltage module 2 provides power for the closing indicator light 12; the main circuit of the opening relay 14 is connected in series with the travel switch 9, the opening indicator light 11 is connected to the normally open end of the opening relay 14 and the power module 2, and the rated voltages of the opening relay 14 and the opening indicator light 11 are both 2 4 volts, and the power supply module 2 provides power; the normally open end of the closing relay 13 is connected in parallel with the normally open end of the intermediate relay 15, and then connected in series with the main circuit of the intermediate relay 15 and the power supply module 2 respectively; the main circuit of the knife gate lock relay 16 is connected in parallel with the buzzer indicator 19, and then connected in series with the normally open end of the opening relay 14 and the detection switch 25; the normally open end of the knife gate lock relay 16 is connected to the knife gate lock 8 and the power supply module 2; the main circuit of the grounding lock relay 17 is connected in parallel with the speaker 20, and then connected to the normally open end of the intermediate relay 15 and the normally closed end of the opening relay 14, and the normally open end of the grounding lock relay 17 is connected to the grounding lock 7. In the embodiment of the present invention, the rated voltage of the intermediate relay 15, the buzzer indicator 19, the knife gate lock relay 16, the grounding lock relay 17, the knife gate lock 8, and the grounding lock 7 are all 24 volts, and the working power is provided by the power supply module 2. The buzzer indicator 19 is an audible and visual alarm, which is used to provide sound and light warnings. When the discharge rod 6 is taken out and the knife switch 5 is closed to the grounding terminal, a warning signal is provided to the test personnel during the discharge test. If the discharge rod 6 is not returned to the designated place after the grounding discharge experiment is completed, the detection switch 25 does not detect the discharge rod 6, and the buzzer indicator 19 is always in the on state. On the one hand, it can remind the experimenter to put the discharge rod 6 back to the designated place. On the other hand, at this time, the knife switch lock 8 is always in the on-locked state. The knife switch lock 8 is used to limit the knife switch 5 from closing from the grounding terminal to the incoming line terminal to prevent the occurrence of accidental closing accidents, thereby playing a locking role.In the embodiment of the present invention, the discharge rod 6 is a retractable discharge rod. The discharge rod 6 and the box body 1 can be connected in a ring buckle manner. A grounding lock 7 is provided at one end of the buckle, which can facilitate the removal of the discharge rod and lock the discharge rod. In the embodiment of the present invention, the grounding lock 7 and the knife switch lock 8 are both electromagnetic locks, which are convenient for automatic control. When the detection switch 25 detects that the discharge rod 6 is put back, the knife switch lock 8 is in an open state, and the knife switch 5 can be closed to the main circuit end and connected to the main circuit. When the intermediate relay 15 controls the grounding relay 17 to be turned on, the knife switch 5 is closed to the main circuit end, and the speaker 20 is in an on state. The speaker 20 is used to make a sound to remind the operator that the experimental box is in a closed power supply state, and it is forbidden to use the discharge rod 6 for grounding test. The grounding lock 7 is in a locked state, and the grounding lock 7 is used to lock the discharge rod 6. When the knife switch 5 is in a closed state, the grounding lock 7 is controlled by electrical interlocking to lock the discharge rod 6, and it is forbidden to discharge through the discharge rod in the closed power supply state. By forming a linkage lock between the knife switch lock and the grounding lock, the potential safety hazards that may occur during the test are reduced and the safety of the test is improved.

[0023] The box body 1 is provided with a thermometer and humidity meter 21, which is used to measure the ambient temperature and humidity. The box body 1 is provided with three groups of voltmeters 22, which are connected to the incoming line end of the knife switch 5 and are used to measure the incoming line end voltage of the knife switch 5.

[0024] The inlet socket 3 and outlet socket 4 are both three-phase five-wire explosion-proof sockets. The three-phase five-wire explosion-proof socket adopted by the present invention improves the application range of the power supply box and meets the test requirements of different occasions. At the same time, the knife switch adopts a 4P double-throw knife switch to improve the flexibility and reliability of power switching. The knife switch 5 is a 4P double throw knife switch. One end of the knife switch 5 can be connected to the main circuit, and the other end can connect the main circuit outlet terminal with the ground terminal to ensure that the outlet terminal is reliably grounded.

[0025] Four sets of universal wheels 23 are fixedly arranged at the bottom of the box 1. The device of the present invention has a compact design and a reasonable structure. The box integrates a power module, a knife switch, an air switch and other circuit components, making the device small in size and light in weight. Universal wheels are installed at the bottom of the box for easy transportation and installation, which greatly improves the convenience of field tests.

[0026] The box body 1 is provided with a spare socket 24 , which is connected to the outlet socket 4 , and is a single-phase five-hole socket.

[0027] The air switch 10 has overload, short circuit and pressure loss protection functions.

[0028] The power module 2 is a 24V battery pack.

[0029] A portable intelligent test power box experimental method comprises the following steps: Step s1, preparation step, connecting the incoming socket 3 and the outgoing socket 4 to the incoming terminal and the outgoing terminal of the knife switch 5 respectively, connecting the grounding terminal of the knife switch 5 to the ground wire, setting the travel switch 9 on one side of the grounding terminal of the knife switch 5, connecting the closing relay 13 to the outgoing terminal of the knife switch 5, and connecting the opening relay 14, the intermediate relay 15, the knife lock relay 16, and the ground lock relay 17 to the power module 2 respectively; Step s2, closing step, closing the knife switch 5 to the outgoing line circuit end, closing the air switch 10, at this time, the closing relay 13 is turned on, the closing indicator light 12 is on, the intermediate relay 15 and the grounding lock relay 17 are respectively turned on, the grounding lock 7 is locked, the speaker 20 is in the on state and emits a warning sound, the grounding lock 7 is used to lock the discharge rod 6, and during the closing step, the discharge rod 6 cannot be taken out; Step s3, grounding step, the air switch 10 is opened, the knife switch 5 is opened, the operating handle of the knife switch 5 is opened to the grounding end, the operating handle contacts the travel switch 9, the travel switch 9 is turned on, the opening relay 14 is turned on, the opening indicator light 11 is on, the grounding lock relay 17 is disconnected, and the grounding lock 7 is opened. At this time, the discharge rod 6 can be taken out for discharge test; Step s4, a rod taking step, the grounding lock 7 is opened, and the discharge rod 6 can be taken out for grounding discharge. After the discharge rod 6 is taken out, the detection switch 25 detects that the discharge rod 6 is taken out, at which time the detection switch 25 is turned on, the knife switch lock relay 16 and the buzzer indicator 19 are turned on, the knife switch lock 8 is locked, and the knife switch lock 8 is used to lock the knife switch 5. At this time, the knife switch 5 cannot be closed; Step s5, the rod-collecting step, after the ground discharge experiment, the discharge rod 6 is put back, the discharge rod 6 is in contact with the detection switch 25, and the detection switch 25 detects that the discharge rod 6 is put back. At this time, the detection switch 25 is disconnected, the knife switch lock relay 16 and the buzzer indicator 19 are disconnected, the knife switch lock 8 is in the open state, the knife switch 5 is in the released state, and the knife switch 5 can be closed.

[0030] Of course, the above embodiments are not intended to limit the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by technicians in this technical field within the essential scope of the present invention should also fall within the protection scope of the present invention.

Claims

1. A portable intelligent test power supply box, comprising a box body (1), characterized in that: A power module (2) is arranged in the box (1), an input socket (3) and an output socket (4) are arranged at the front end of the box (1), a knife switch (5) is arranged above the box (1), the input socket (3) and the output socket (4) are respectively connected to the input and output circuits of the knife switch (5), the grounding end of the knife switch (5) is connected to the ground circuit, an air switch (10) is arranged between the output end of the knife switch (5) and the output socket (4), the air switch (10) is respectively connected to the knife switch (5) and the output socket (4) circuits, A discharge rod (6) is arranged on one side of the box (1), and a detection switch (25) is arranged on one side of the discharge rod (6), the detection switch (25) is abutted and connected with the discharge rod (6), and the detection switch (25) is used to detect the removal and placement of the discharge rod (6), a grounding lock (7) is arranged between the discharge rod (6) and the box (1), a knife switch lock (8) and a travel switch (9) are arranged at the grounding end of the knife switch (5), the travel switch (9) is abutted and connected with the handle of the knife switch (5), and the knife switch lock (8) and the travel switch (9) are electrically connected to the grounding lock (7).

2. A portable intelligent test power box according to claim 1, characterized in that: The box body (1) is respectively provided with an opening indicator light (11), a closing indicator light (12), a closing relay (13), an opening relay (14), an intermediate relay (15), a knife switch lock relay (16), a ground lock relay (17), a buzzer indicator (19) and a loudspeaker (20); The two ends of the main circuit of the closing relay (13) are respectively connected to the outlet end of the knife switch (5) and the air switch (10), and the closing indicator light (12) is connected to the normally open end of the closing relay (13) and the power module (2); The main circuit of the opening relay (14) is connected in series with the travel switch (9), and the opening indicator light (11) is connected to the normally open end of the opening relay (14) and the power module (2); The normally open end of the closing relay (13) is connected in parallel with the normally open end of the intermediate relay (15) and then connected in series with the main circuit of the intermediate relay (15) and the power module (2); The main circuit of the knife lock relay (16) is connected in parallel with the buzzer indicator (19) and then connected in series with the normally open end of the opening relay (14) and the detection switch (25); the normally open end of the knife lock relay (16) is connected to the knife lock (8) and the power module (2); The main circuit of the grounding lock relay (17) is connected in parallel with the speaker (20) and then connected to the normally open end of the intermediate relay (15) and the normally closed end of the opening relay (14); the normally open end of the grounding lock relay (17) is connected to the grounding lock (7).

3. A portable intelligent test power box according to claim 1, characterized in that: The box (1) is provided with a temperature and humidity meter (21), and the temperature and humidity meter (21) is used to measure the ambient temperature and humidity. The box (1) is provided with three sets of voltmeters (22), and the voltmeters (22) are connected to the incoming line end of the knife switch (5) and are used to measure the incoming line end voltage of the knife switch (5).

4. The portable intelligent test power box according to claim 1, characterized in that: The incoming line socket (3) and the outgoing line socket (4) are both three-phase five-wire explosion-proof sockets.

5. The portable intelligent test power box according to claim 1, characterized in that: The knife switch (5) is a 4P double-throw knife switch.

6. A portable intelligent test power supply box according to any one of claims 1 to 5, characterized in that: Four sets of universal wheels (23) are fixedly arranged at the bottom of the box body (1).

7. The portable intelligent test power box according to claim 3, characterized in that: The box body (1) is provided with a spare socket (24), the spare socket (24) is connected to the outlet socket (4), and the spare socket (24) is a single-phase five-hole socket.

8. The portable intelligent test power supply box according to claim 1, characterized in that: The air switch (10) has overload, short circuit and pressure loss protection functions.

9. The portable intelligent test power box according to claim 1, characterized in that: The power module (2) is a 24V battery pack.

10. A portable intelligent test power box experimental method, characterized in that: The following steps are involved: Step s1, a preparation step, connecting the incoming line socket (3) and the outgoing line socket (4) to the incoming line terminal and the outgoing line terminal of the knife switch (5) respectively, connecting the grounding terminal of the knife switch (5) to the ground wire, setting the travel switch (9) on the side of the grounding terminal of the knife switch (5), connecting the closing relay (13) to the outgoing line terminal of the knife switch (5), and connecting the opening relay (14), the intermediate relay (15), the knife switch lock relay (16), and the ground lock relay (17) to the power module (2) respectively; Step s2, a closing step, closing the knife switch (5) to the outgoing line circuit end, closing the air switch (10), at which time the closing relay (13) is turned on, the closing indicator light (12) is on, the intermediate relay (15) and the grounding lock relay (17) are respectively turned on, the speaker (20) is in the on state and emits a warning sound, the grounding lock (7) is in the locked state, and the grounding lock (7) is used to lock the discharge rod (6). During the closing step, the discharge rod (6) cannot be removed; Step s3, grounding step, the air switch (10) is opened, the knife switch (5) is opened, the operating handle of the knife switch (5) is opened to the grounding end, the operating handle contacts the travel switch (9), the travel switch (9) is turned on, the opening relay (14) is turned on, the opening indicator light (11) is lit, the grounding lock relay (17) is disconnected, and the grounding lock (7) is opened. At this time, the discharge rod (6) can be taken out for discharge test; Step s4, a rod taking step, the grounding lock (7) is opened, and the discharge rod (6) can be taken out for grounding discharge. After the discharge rod (6) is taken out, the detection switch (25) detects that the discharge rod (6) is taken out. At this time, the detection switch (25) is turned on, the knife switch lock relay (16) and the buzzer indicator (19) are turned on, and the knife switch lock (8) is locked. The knife switch lock (8) is used to lock the knife switch (5). At this time, the knife switch (5) cannot be closed; Step s5, a rod retracting step, after the ground discharge experiment is performed, the discharge rod (6) is put back, the discharge rod (6) is in contact with the detection switch (25), and the detection switch (25) detects that the discharge rod (6) is put back. At this time, the detection switch (25) is disconnected, the knife switch lock relay (16) and the buzzer indicator (19) are disconnected, the knife switch lock (8) is in an open state, the knife switch (5) is in a released state, and the knife switch (5) can be closed.

Images