Device for testing thermal stability of high-voltage isolating switch

Abstract

The invention discloses a high-voltage disconnecting switch thermal stability testing device, and relates to the technical field of disconnecting switch thermal stability testing, control cavities are symmetrically arranged on the left and right sides of a testing cavity, circulation cavities are symmetrically arranged on the front and rear sides of the testing cavity, and a middle partition plate is arranged in the testing cavity and divides the testing cavity into a mounting cavity and a testing cavity; a resistance tester is arranged above the base, connecting wires are installed on the two sides of the resistance tester respectively, one ends of the connecting wires are connected with the resistance tester, the other ends of the connecting wires penetrate through the base to be arranged in the control cavities, measuring contact pins are arranged at the other ends of the connecting wires, control assemblies are installed in the control cavities, and heating assemblies are arranged in the circulation cavities. A rotating mechanism is arranged in the mounting cavity; the device solves the problem that the thermal stability of the high-voltage isolation switch is misjudged due to the fact that the resistance value of the high-voltage isolation switch cannot be measured in time through manual operation in a high-temperature state.

Description

Technical Field

[0001] The invention relates to the technical field of thermal stability testing of isolating switches, and more particularly to a thermal stability testing device for high-voltage isolating switches. Background Art

[0002] High-voltage disconnectors are important switchgear in the electrical systems of power plants and substations. They must be used in conjunction with high-voltage circuit breakers. Disconnectors are suitable for indoor installations with three-phase AC 50Hz and rated voltage 12KV. They are used to connect, disconnect or convert lines when there is voltage but no load current in high-voltage equipment. Their main functions are to ensure the safety of high-voltage electrical appliances and devices during maintenance work and to isolate voltage. They cannot be used to cut off, input load current or interrupt short-circuit current, and can only be used for certain switching operations that do not generate strong arcs.

[0003] In the prior art, since the rated voltage of the high-voltage disconnector is 12kV or above and the working environment is in a high temperature state, it is necessary to conduct a thermal stability test on the disconnector to verify its reliability and stability in a high temperature environment to prevent its performance from being unstable or malfunctioning due to being in a high temperature environment, resulting in a circuit short circuit, and then causing a fire. At present, the thermal stability test of the high-voltage disconnector is generally performed by placing it in a simulated high-temperature environment, heating the high-voltage disconnector for a period of time so that the high-voltage disconnector reaches a specified temperature, and then taking out the high-voltage disconnector. The operator measures the resistance value of the high-voltage disconnector through a resistance tester to determine the reliability and stability of the high-voltage disconnector in a high-temperature environment. However, since the high-voltage disconnector in a high-temperature state is not conducive to manual measurement, it is easy to cause burns to the operator. If the measurement is performed when the temperature of the high-voltage disconnector drops, it will cause errors in the measurement results, thereby affecting the judgment of the thermal stability of the high-voltage disconnector.

[0004] In view of the above situation, the present invention designs a high-voltage isolating switch thermal stability testing device to solve the above technical problems. Summary of the invention

[0005] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a thermal stability testing device for high-voltage disconnectors, which solves the problem that manual operation cannot timely measure the resistance value of high-voltage disconnectors under high temperature conditions, resulting in misjudgment of the thermal stability of the high-voltage disconnectors.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a high-voltage isolating switch thermal stability test device, used for detecting the resistance value of the isolating switch under high temperature state, comprising a base, a test cavity is provided inside the base, the test cavity is used for placing the high-voltage isolating switch and performing thermal stability test on the high-voltage isolating switch, a sealing plate is rotatably arranged above the base, control cavities are symmetrically arranged on the left and right sides of the test cavity, flow cavities are symmetrically arranged on the front and back sides of the test cavity, and a middle partition is arranged in the test cavity, the middle partition divides the measuring cavity into an installation cavity and a test cavity; a resistance tester is arranged above the base, and connecting wires are respectively installed on both sides of the resistance tester, one end of the connecting wire is connected to the resistance tester, and the connection The other end of the wire passes through the base and is arranged in the control cavity, and a measuring pin is arranged at the other end of the connecting wire, a control component is installed in the control cavity, a heating component is arranged in the circulation cavity, and a rotating mechanism is arranged in the installation cavity; when the high-voltage isolating switch is subjected to a thermal stability test, the rotating mechanism is used to clamp the high-voltage isolating switch, and the rotating mechanism drives the high-voltage isolating switch to rotate, and the high-voltage isolating switch rotates to the front of the circulation cavity, and the high-voltage isolating switch is heated internally and externally by the heating component. After the heating is completed, the rotating mechanism drives the high-voltage isolating switch to rotate, and the high-voltage isolating switch rotates to the front of the control cavity, and the resistance value of the high-voltage isolating switch is measured by the control component, so that the thermal stability of the high-voltage isolating switch is reflected by the resistance value.

[0007] Preferably, the rotating mechanism includes a driving motor, a turntable and a fixed plate, the driving motor is arranged in the installation cavity, and the output end of the driving motor vertically passes through the middle partition, the output end of the driving motor is connected to the turntable, and the turntable is cross-shaped, and each end of the cross-shaped turntable is provided with a fixed plate, and the fixed plate is used to clamp the high-voltage disconnector.

[0008] Preferably, a mounting hole is opened on one side of the fixed plate, a control spring is arranged in the mounting hole, one end of the control spring is fixedly connected to the bottom of the mounting hole, and the other end of the control spring is connected to a movable plate, and the movable plate drives the control spring to stretch or contract in the mounting hole, thereby adapting to high-voltage disconnectors of different sizes.

[0009] Preferably, the heating assembly includes an airbag, a partition plate and a heating rod. The airbag is arranged in the circulation cavity, and one end of the airbag is connected to a heating source. A partition plate is arranged on the top of the airbag, and the partition plate is used to limit the direction of expansion of the airbag. An air outlet hole is opened at the top of the airbag, and the same through hole is arranged at the corresponding position of the partition plate. A mounting plate is arranged on one side of the airbag, and heating rods are symmetrically arranged on the mounting plate, and the heating rods are arranged through the circulation cavity.

[0010] Preferably, a plurality of air outlet holes are provided at the top of the airbag, and overflow valves are provided on the plurality of air outlet holes, and the overflow valve is used to prevent the airbag from being damaged due to excessive expansion of the airbag.

[0011] Preferably, the control includes a rotating roller, an electromagnet and a rotating plate, the rotating roller is rotatably arranged at the top of the control cavity, and a spiral groove is opened on the rotating roller, a connecting wire is wound on the spiral groove, a limiting groove is opened on the side of the control cavity close to the base, and an electromagnet is slidably arranged in the limiting groove, a rotating plate is rotatably arranged at the bottom end of the control cavity, one end of the rotating plate is rotatably arranged on the side of the bottom end of the control cavity close to the inner wall of the base, and the other end of the rotating plate is in contact with the side of the control cavity away from the inner wall of the base, a connecting spring is arranged at the bottom end of the control cavity, one end of the connecting spring is connected to the bottom end of the control cavity, and the other end of the connecting spring is fixedly connected to one side of the rotating plate.

[0012] Preferably, the connecting wire is wound in a spiral groove formed in the rotating roller, and a measuring pin is provided at the other end of the connecting wire. The measuring pin is provided on one side of the rotating plate, and the measuring pin is fixedly connected to the rotating plate.

[0013] Preferably, the measuring pin is a retractable structure, and the rotating plate swings and unfolds, and the measuring pin extends so that the measuring pin contacts the high-voltage isolating switch, thereby measuring the resistance value of the high-voltage isolating switch using a resistance tester.

[0014] Beneficial effects of the present invention:

[0015] 1. The present invention provides a device for testing the thermal stability of high-voltage disconnectors. The device uses a cross-shaped fixed disk on a rotating mechanism. When testing, different types of high-voltage disconnectors can be installed at relative positions of the fixed disk. The fixed disk is driven to rotate by the rotation of a driving motor, so that different types of high-voltage disconnectors can be tested for thermal stability under the same environment, and then different types of high-voltage disconnectors can be compared. At the same time, the fixed disk is driven to rotate by the rotating mechanism to test multiple groups of high-voltage disconnectors, thereby improving the overall testing efficiency of the device.

[0016] 2. A thermal stability testing device for a high-voltage isolating switch provided by the present invention, wherein a circulation chamber and a control chamber are arranged at relative positions in front, back, left and right of the test chamber, and the heating components and control components in the control chamber and the circulation chamber are used to first heat the high-voltage isolating switch internally and then heat it externally, thereby simulating the heat generation process of the high-voltage isolating switch under normal working or overload conditions, which is helpful to evaluate the performance of the internal components of the switch (such as contacts, conductive connectors, etc.) at high temperatures, and avoid poor contact or insulation damage due to excessive temperature. The subsequent external heating is to simulate the influence of the external ambient temperature. The switch may face an increase in external temperature under high temperature conditions, especially in hot climates or under conditions of high internal temperature of the equipment. External heating simulates the influence of such environmental changes on the overall thermal stability of the switch. After the heating is completed, the rotating mechanism drives the fixed disk to rotate, and the control component can timely measure the resistance value of the high-voltage isolating switch, thereby avoiding the phenomenon that the temperature of the high-voltage isolating switch drops, resulting in errors in its resistance value measurement results, and errors in its thermal stability judgment results. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0018] Figure 2 A half-section view of the overall structure of the present invention;

[0019] Figure 3 For the present invention Figure 2 A partial enlarged view of the middle A;

[0020] Figure 4 A partial cross-sectional view of a control assembly of the present invention;

[0021] Figure 5 It is a half-section view of the rotating mechanism of the present invention cooperating with the heating component.

[0022] Reference numerals:

[0023] 1. Base; 11. Test cavity; 12. Sealing plate; 13. Control cavity; 131. Limiting groove; 14. Flow cavity; 15. Middle partition; 16. Installation cavity; 2. Resistance tester; 21. Connecting wire; 22. Measuring pin; 3. Rotating mechanism; 31. Driving motor; 32. Turntable; 33. Fixed plate; 34. Mounting hole; 35. Control spring; 36. Moving plate; 4. Heating component; 41. Air bag; 411. Air outlet; 42. Partition plate; 43. Heating rod; 5. Control component; 51. Rotating roller; 52. Electromagnet; 53. Rotating plate; 531. Connecting spring. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution of the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings of the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments. Based on the described embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0025] refer to Figures 1 to 5 As shown, a high-voltage isolating switch thermal stability test device is used to detect the resistance value of the isolating switch under high temperature state, including a base 1, a test cavity 11 is opened inside the base 1, the test cavity 11 is used to place the high-voltage isolating switch and perform thermal stability test on the high-voltage isolating switch, a sealing plate 12 is rotatably arranged above the base 1, control cavities 13 are symmetrically arranged on the left and right sides of the test cavity 11, and flow cavities 14 are symmetrically arranged on the front and back sides of the test cavity 11, and a middle partition 15 is arranged in the test cavity 11, and the middle partition 15 divides the measuring cavity into an installation cavity 16 and a test cavity 11; a resistance tester 2 is arranged above the base 1, and connecting wires 21 are respectively installed on both sides of the resistance tester 2, one end of the connecting wire 21 is connected to the resistance tester 2, and the other end of the connecting wire 21 passes through the bottom The seat 1 is arranged in the control cavity 13, and a measuring pin 22 is arranged at the other end of the connecting wire 21, a control component 5 is installed in the control cavity 13, a heating component 4 is arranged in the circulation cavity 14, and a rotating mechanism 3 is arranged in the installation cavity 16; when the high-voltage isolating switch is subjected to a thermal stability test, the rotating mechanism 3 is used to clamp the high-voltage isolating switch, and the rotating mechanism 3 drives the high-voltage isolating switch to rotate, and the high-voltage isolating switch rotates to the front of the circulation cavity 14, and the high-voltage isolating switch is heated internally and externally by the heating component 4. After the heating is completed, the rotating mechanism 3 drives the high-voltage isolating switch to rotate, and the high-voltage isolating switch rotates to the front of the control cavity 13, and the resistance value of the high-voltage isolating switch is measured by the control component 5, so that the thermal stability of the high-voltage isolating switch is reflected by the resistance value.

[0026] Specifically, the rotating mechanism 3 includes a driving motor 31, a turntable 32 and a fixed plate 33. The driving motor 31 is arranged in the installation cavity 16, and the output end of the driving motor 31 vertically passes through the middle partition 15. The output end of the driving motor 31 is connected to the turntable 32, and the turntable 32 is cross-shaped. A fixed plate 33 is arranged at each end of the cross-shaped turntable 32, and the fixed plate 33 is used to clamp the high-voltage disconnector.

[0027] Specifically, a mounting hole 34 is opened on one side of the fixed plate 33, and a control spring 35 is arranged in the mounting hole 34. One end of the control spring 35 is fixedly connected to the bottom of the mounting hole 34, and the other end of the control spring 35 is connected to a movable plate 36. The movable plate 36 drives the control spring 35 to stretch or contract in the mounting hole 34, so as to adapt to high-voltage disconnectors of different sizes.

[0028] Specifically, the heating assembly 4 includes an airbag 41, a partition plate 42 and a heating rod 43. The airbag 41 is arranged in the circulation cavity 14, and one end of the airbag 41 is connected to a heating source. A partition plate 42 is arranged at the top of the airbag 41. The partition plate 42 is used to limit the expansion direction of the airbag 41. An air outlet hole 411 is opened at the top of the airbag 41, and the same through hole is arranged at the corresponding position of the partition plate 42. A mounting plate is arranged on one side of the airbag 41, and heating rods 43 are symmetrically arranged on the mounting plate. The heating rods 43 are arranged to pass through the circulation cavity 14.

[0029] Specifically, a plurality of air outlet holes 411 are provided at the top of the airbag 41 , and overflow valves are provided on the plurality of air outlet holes 411 . The overflow valves are used to prevent the airbag 41 from being damaged due to excessive expansion of the airbag 41 .

[0030] Specifically, the control includes a rotating roller 51, an electromagnet 52 and a rotating plate 53. The rotating roller 51 is rotatably set at the top of the control chamber 13, and a spiral groove is opened on the rotating roller 51, and a connecting line 21 is wound on the spiral groove. A limiting groove 131 is opened on the side of the control chamber 1 close to the base 1, and the electromagnet 52 is slidably set in the limiting groove 131. A rotating plate 53 is rotatably set at the bottom end of the control chamber 13. One end of the rotating plate 53 is rotatably set at the bottom end of the control chamber 13 close to the inner wall of the base 1, and the other end of the rotating plate 53 contacts with the side of the control chamber 13 away from the inner wall of the base 1. A connecting spring 531 is set at the bottom end of the control chamber 13, one end of the connecting spring 531 is connected to the bottom end of the control chamber 13, and the other end of the connecting spring 531 is fixedly connected to one side of the rotating plate 53.

[0031] Specifically, the connecting wire 21 is wound in the spiral groove formed in the rotating roller 51 , and a measuring pin 22 is provided at the other end of the connecting wire 21 . The measuring pin 22 is provided on one side of the rotating plate 53 , and the measuring pin 22 is fixedly connected to the rotating plate 53 .

[0032] Specifically, the measuring pin 22 is a retractable structure. The rotating plate 53 swings and unfolds, and the measuring pin 22 extends so that the measuring pin 22 contacts the high-voltage disconnector, thereby using the resistance tester 2 to measure the resistance value of the high-voltage disconnector.

[0033] Working process and working principle: the operator first pulls the movable plate 36, and one end of the movable plate 36 moves in the mounting hole 34. At this time, the movable plate 36 will drive the control spring 35 to extend, and then the high-voltage isolating switch is placed on the fixed plate 33. At this time, the operator releases the movable plate 36. Due to the elastic potential energy of the control spring 35, the movable plate 36 will move toward the fixed plate 33, thereby clamping the high-voltage isolating switch to prevent the high-voltage isolating switch from shaking or falling off during the test. After the clamping is completed, the drive motor 31 is started, and the drive motor 31 rotates to drive the turntable 32 connected to the output end of the drive motor 31 to rotate. At this time, the high-voltage isolating switch on one side of the turntable 32 is moved to the flow chamber 14, and the two A heating component 4 is provided at the circulation chamber 14 on the side. When the high-voltage isolating switch moves to the heating component 4, the airbag 41 is inflated by the heating source on one side of the airbag 41. The airbag 41 gradually expands after being inflated. The expansion of the airbag 41 squeezes the mounting plate to make the heating rod 43 contact the high-voltage isolating switch. At this time, the heating rod 43 is energized, and the heating rod 43 is energized to heat the internal part of the high-voltage isolating switch. Due to the limitation of the circulation chamber 14 and the partition plate 42, the airbag 41 can only expand to one side. When the airbag 41 expands to a certain extent, the hot air generated by the heating source will move to the top of the circulation chamber 14 through the overflow valve. At this time, the hot air will fill the entire test chamber 11, thereby simulating the high-voltage isolating switch in a high-temperature environment.

[0034] After the heating is completed, the driving motor 31 drives the turntable 32 to continue to rotate. At this time, the high-voltage isolating switch on the turntable 32 faces the control chamber 13. In order to ensure that the resistance value of the high-voltage isolating switch can be measured in time, since the electromagnet 52 is arranged in the limit groove 131, and two groups are arranged, one group of electromagnets 52 is arranged on the rotating plate 53, and the other group of electromagnets 52 is slidably arranged in the limit groove 131, when the resistance value is detected, the two groups of electromagnets 52 pass opposite currents, and the electromagnets 52 in the limit groove 131 move downward due to the principle of like attracts like. At this time, the rotating plate 53 swings to drive the connecting wire 21 to rotate on the rotating roller 51. Through such a setting, the connecting wire 21 can be prevented from being entangled on the rotating roller 51. At the same time, the rotating plate 53 rotates to squeeze the connecting spring 531. Since the measuring pin 2 2 is a retractable structure. The swing of the rotating plate 53 causes the measuring pin 22 to expand. At this time, the measuring pin 22 expands and contacts the high-voltage disconnector to measure its resistance value. After the measurement is completed, current is passed through the two groups of electromagnets 52 in the same direction. At this time, the electromagnet 52 on the rotating plate 53 pushes the electromagnet 52 in the limit groove 131 to move upward. At this time, the rotating plate 53 is reset due to the spring potential energy of the connecting spring 531. The measuring pin 22 contracts when the rotating plate 53 is reset, thereby completing the measurement of the resistance value of the high-voltage disconnector, and then being able to timely measure the resistance value of the high-voltage disconnector in a high-temperature state, thereby avoiding the temperature drop of the high-voltage disconnector causing an error in the measured resistance value, thereby avoiding the inaccurate evaluation of the thermal stability of the high-voltage disconnector.

[0035] The above embodiments are only exemplary embodiments of the present invention and are not intended to limit the present invention. The protection scope of the present invention is defined by the claims. Those skilled in the art may make various modifications or equivalent substitutions to the present invention within the essence and protection scope of the present invention, and such modifications or equivalent substitutions shall also be deemed to fall within the protection scope of the present invention.

Claims

1. A high-voltage disconnector thermal stability test device, used for detecting the resistance value of the disconnector under high temperature, comprising a base (1), wherein a test cavity (11) is provided inside the base (1), wherein the test cavity (11) is used for placing the high-voltage disconnector and performing a thermal stability test on the high-voltage disconnector, wherein a sealing plate (12) is rotatably provided above the base (1), wherein: The test chamber (11) is symmetrically provided with control chambers (13) on the left and right sides, the test chamber (11) is symmetrically provided with flow chambers (14) on the front and rear sides, and a middle partition (15) is provided in the test chamber (11), and the middle partition (15) divides the measuring chamber into an installation chamber (16) and a test chamber (11); A resistance tester (2) is arranged above the base (1), and connecting wires (21) are respectively installed on both sides of the resistance tester (2), one end of the connecting wire (21) is connected to the resistance tester (2), the other end of the connecting wire (21) passes through the base (1) and is arranged in the control cavity (13), and a measuring pin (22) is arranged at the other end of the connecting wire (21), a control component (5) is installed in the control cavity (13), a heating component (4) is installed in the circulation cavity (14), and a rotating mechanism (3) is arranged in the installation cavity (16); When the high-voltage disconnector is subjected to a thermal stability test, the rotating mechanism (3) is used to clamp the high-voltage disconnector, and the rotating mechanism (3) drives the high-voltage disconnector to rotate. The high-voltage disconnector rotates to the front of the flow chamber (14), and the heating component (4) heats the high-voltage disconnector internally and externally. After the heating is completed, the rotating mechanism (3) drives the high-voltage disconnector to rotate. The high-voltage disconnector rotates to the front of the control chamber (13), and the resistance value of the high-voltage disconnector is measured by the control component (5), so that the thermal stability of the high-voltage disconnector is reflected by the resistance value.

2. A high-voltage disconnector thermal stability testing device according to claim 1, characterized in that: The rotating mechanism (3) comprises a driving motor (31), a rotating disk (32) and a fixing plate (33). The driving motor (31) is arranged in the installation cavity (16), and the output end of the driving motor (31) vertically penetrates the middle partition (15). The output end of the driving motor (31) is connected to the rotating disk (32), and the rotating disk (32) is cross-shaped. A fixing plate (33) is arranged at each end of the cross-shaped rotating disk (32), and the fixing plate (33) is used to clamp the high-voltage disconnector.

3. A high-voltage disconnector thermal stability testing device according to claim 2, characterized in that: A mounting hole (34) is provided on one side of the fixed plate (33), a control spring (35) is arranged in the mounting hole (34), one end of the control spring (35) is fixedly connected to the bottom of the mounting hole (34), and the other end of the control spring (35) is connected to a movable plate (36), and the movable plate (36) drives the control spring (35) to stretch or contract in the mounting hole (34), thereby adapting to high-voltage disconnectors of different sizes.

4. A high-voltage disconnector thermal stability testing device according to claim 1, characterized in that: The heating assembly (4) comprises an airbag (41), a partition plate (42) and a heating rod (43); the airbag (41) is arranged in the circulation cavity (14), and one end of the airbag (41) is connected to a heating source; a partition plate (42) is arranged at the top of the airbag (41); the partition plate (42) is used to limit the expansion direction of the airbag (41); an air outlet hole (411) is opened at the top of the airbag (41), and the same through hole is arranged at a corresponding position of the partition plate (42); a mounting plate is arranged on one side of the airbag (41), and the heating rods (43) are symmetrically arranged on the mounting plate; the heating rods (43) are arranged to pass through the circulation cavity (14).

5. A high-voltage disconnector thermal stability testing device according to claim 4, characterized in that: A plurality of air outlet holes (411) are provided at the top of the air bag (41), and each of the plurality of air outlet holes (411) is provided with an overflow valve, wherein the overflow valve is used to prevent the air bag (41) from being damaged due to excessive expansion of the air bag (41).

6. A high-voltage disconnector thermal stability testing device according to claim 1, characterized in that: The control comprises a rotating roller (51), an electromagnet (52) and a rotating plate (53); the rotating roller (51) is rotatably arranged at the top of the control cavity (13); a spiral groove is provided on the rotating roller (51); a connecting wire (21) is wound on the spiral groove; a limiting groove (131) is provided on a side of the control cavity (13) close to the base (1); an electromagnet (52) is slidably arranged in the limiting groove (131); a rotating plate (53) is rotatably arranged at the bottom end of the control cavity (13); one end of the rotating plate (53) is rotatably arranged at a side of the bottom end of the control cavity (13) close to the inner wall of the base (1); the other end of the rotating plate (53) contacts with a side of the control cavity (13) away from the inner wall of the base (1); a connecting spring (531) is provided at the bottom end of the control cavity (13); one end of the connecting spring (531) is connected to the bottom end of the control cavity (13); and the other end of the connecting spring (531) is fixedly connected to one side of the rotating plate (53).

7. A high-voltage disconnector thermal stability testing device according to claim 1, characterized in that: The connecting wire (21) is wound in a spiral groove formed in the rotating roller (51), and a measuring pin (22) is provided at the other end of the connecting wire (21). The measuring pin (22) is provided on one side of the rotating plate (53), and the measuring pin (22) is fixedly connected to the rotating plate (53).

8. A high-voltage disconnector thermal stability testing device according to claim 7, characterized in that: The measuring pin (22) is a retractable structure. The rotating plate (53) swings and unfolds, and the measuring pin (22) extends so that the measuring pin (22) contacts the high-voltage isolating switch, thereby measuring the resistance value of the high-voltage isolating switch using the resistance tester (2).

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