A special discharge device for power capacitors

Abstract

The present invention belongs to the technical field of electric power tools and discloses a special discharge device for power capacitors, which has a short-circuit component, an insulating grip component, a grounding component, and an adjustable universal joint (7). It is characterized in that the short-circuit component is composed of a short-circuit telescopic rod (1), a finger contact part, and a finger contact connection part (3), and the insulating grip component is composed of a telescopic insulating rod (8) and a handheld insulating handle (9); the grounding component is composed of a discharge resistance component (5), a grounding wire, and a grounding terminal clamp. This application solves the requirements stipulated in Article 7.4.2 of the State Grid Safety Regulations: after verifying that the equipment is indeed without voltage, the equipment under repair should be immediately grounded and three-phase short-circuited. And the requirement that the full discharge time of each 10 kV capacitor bank is controlled within 5 minutes. The present invention has the following beneficial effects: the charge in the capacitor is released more thoroughly, the personal safety of power workers is ensured, the operation of related equipment is safer, and the man-hours for capacitor maintenance operations are shortened.

Description

Technical Field

[0001] The invention belongs to the technical field of electric tools, and particularly relates to a special discharge device for power capacitors. Background Art

[0002] Capacitors belong to energy storage devices. Even if the device is shut down, there will still be a certain amount of residual charge inside. To ensure the safety of operators, the process for electric power operators during maintenance operations is to first cut off the power, test for voltage, ground, and fully discharge the equipment to be repaired. For a single capacitor inside a 10KV capacitor bank in a substation, since there are two pole outlet bushings for a single capacitor, the two pole bushings must be short-circuited and grounded simultaneously to fully release the residual charge. To ensure the safety of electric power production, before the staff conducts maintenance work on the capacitor bank, they must first use a capacitor bank discharge tool to discharge it multiple times one by one before they can start working. Existing discharge tools are all for discharging the entire capacitor bank, which is time-consuming and laborious during the discharge operation and it is difficult to discharge quickly, effectively, and fully.

[0003] CN 212011603U discloses a Y-shaped capacitor discharge device, which relates to the technical field of electric power equipment and includes a capacitor. One side of the capacitor is movably connected with a discharge tip. One end inside the discharge tip is fixedly connected with a current wire. One end of the current wire is fixedly connected with a fuse resistor. The fuse resistor is located in the middle of the current wire. The end of the current wire away from the discharge tip is fixedly connected with a transmission column. Limit slots are opened at the top and bottom of the transmission column, and a first spring is fixedly connected inside the limit slots. For this Y-shaped capacitor discharge device, by arranging a fuse resistor inside the discharge tip, the current is transmitted through the fuse resistor. When the capacitor has a short circuit, the current flow will increase. When a large current passes through the fuse resistor, it will exceed the carrying current of the fuse resistor. Therefore, the fuse resistor will be damaged, thereby blocking the current and protecting the subsequent equipment from being damaged. The discharge head is in a rod shape, which is not convenient for quick discharge.

[0004] CN207069085U discloses a capacitor grounding discharge tool, which includes a first tip metal rod, an insulating bracket, a universal joint, a telescopic arbitrary-lock insulating rod, a short-circuit grounding wire, and a second tip metal rod. The first tip metal rod and the second tip metal rod are installed on an insulating bracket with a sliding groove. A sliding wire resistor is arranged in the middle of the insulating bracket. One end of the sliding wire resistor is connected to the first tip metal rod through a short-circuit grounding wire with a transparent protective sleeve, and the other end is connected to the second tip metal rod. The bare wire end of the short-circuit grounding wire is connected to the ground. One end of the universal joint is connected to the insulating bracket, and the other end is connected to the telescopic arbitrary-lock insulating rod. The utility model improves the discharge conditions and methods, improves the discharge efficiency, and reduces the operation risk. The two poles of the capacitor cannot be clamped tightly, resulting in poor contact and easy insufficient discharge.

[0005] CN 103560004 A discloses a special discharge rod for capacitors, which comprises a discharge arm and a support rod. There are two discharge arms, and the upper ends of the support rod are respectively connected to the lower ends of the two discharge arms. A discharge tip is provided at the upper end of each discharge arm, and a discharge resistor is provided in the inner cavity of each discharge arm. The upper end of the discharge resistor is connected to the discharge tip, and the lower end of the discharge resistor is grounded. A direct grounding jack is provided on the discharge tip, and a resistor grounding jack is provided at the end of the discharge resistor. The lower end of at least one discharge arm is connected to the support rod through a rotation and fixation mechanism, and the included angle can be changed. Both the discharge arm and the support rod are antenna-type telescopic structures, and the length can be changed. The present invention can effectively discharge the capacitor once, ensure the personal safety of substation personnel, ensure the reliability of the equipment, and improve the scientific nature of maintenance. One pole of the 7-position discharge rod is grounded first, which no longer meets the latest discharge requirements.

[0006] CN 2859995 Y discloses a portable bulk capacitor, which overcomes the deficiencies of the prior art. It is composed of a telescopic insulating rod, a discharge head, a discharge lead, a grounding clamp, a copper screw, a copper cap, a washer, a spring washer, and a copper contact head. There is a discharge head at the top of the telescopic insulating rod. The washer and spring washer on the discharge head are sleeved on the copper screw, and the copper cap is fixed at the top of the copper screw by threads. The copper contact head is fixed on the discharge head. One end of the discharge lead is fixed on the discharge head, and the other end is connected to the grounding clamp. When in use, the telescopic insulating rod is pulled open, the copper contact head on the discharge head contacts the capacitor, and the grounding clamp is inserted into the ground for discharge. When the charge is discharged, the insulating rod is then retracted. It is necessary to disassemble and lock the bolts, and it is easy to slip due to poor clamping and contact of the two poles of the capacitor.

[0007] Therefore, the industry expects a special discharge device for power capacitors with high efficiency, rapidity, and reliability. Summary of the Invention

[0008] To solve the above problems, the object of the present invention is to disclose a special discharge device for power capacitors, which is realized by the following technical solutions.

[0009] A special discharge device for power capacitors, which has a short - circuit component, an insulating grip component, a grounding component, and an adjustable universal joint. It is characterized in that the short - circuit component is composed of a short - circuit telescopic rod, a finger - contact part, and a finger - contact connection part. The short - circuit telescopic rod has a short - circuit telescopic rod body. Inside the short - circuit telescopic rod body, there is a telescopic spring and a telescopic rod body. The telescopic rod body is connected to the inner top and bottom ends of the short - circuit telescopic rod body. The telescopic spring is sleeved on the telescopic rod body. The upper connection end of the short - circuit telescopic rod is located at the top of the short - circuit telescopic rod body, and the lower connection end of the short - circuit telescopic rod is located at the bottom of the short - circuit telescopic rod body. The adjusting knob extends from the outside of the short - circuit telescopic rod body into the telescopic rod body and can slide up and down for adjustment. The finger - contact part includes a first contact rod and a second contact rod. The finger - contact connection part can also be called a short - circuit grounding wire. The first contact rod is composed of a first contact rod body and a first contact head. The flat part of the first contact head is connected to one end of the first contact rod body. The other end of the first contact rod body is connected to the first connection body. The upper connection end of the short - circuit telescopic rod is connected to the first connection body, and the short - circuit telescopic rod is perpendicular to the first contact rod body. The second contact rod is composed of a second contact rod body and a second contact head. The flat part of the second contact head is connected to one end of the second contact rod body. The other end of the second contact rod body is connected to the second connection body. The lower connection end of the short - circuit telescopic rod is connected to the second connection body, and the short - circuit telescopic rod is perpendicular to the second contact rod body. The axis of the first contact rod body and the axis of the second contact rod body are in the same plane. The finger - contact connection part is composed of a short - circuit grounding wire body. The short - circuit grounding wire body is a spiral structure. The upper end of the short - circuit grounding wire body is the first end of the short - circuit grounding wire, and the lower end of the short - circuit grounding wire body is the second end of the short - circuit grounding wire. The first end of the short - circuit grounding wire is connected to the first connection body, and the second end of the short - circuit grounding wire is connected to the second connection body. The insulating grip component is composed of a telescopic insulating rod and a hand - held insulating handle. The grounding component is composed of a resistance - discharge component, a grounding wire, and a grounding terminal clip. The resistance - discharge component is located inside the telescopic insulating rod. One end of the resistance - discharge component is connected to the second end of the short - circuit grounding wire. The telescopic insulating rod has multiple sections and adjacent sections are connected by an adjustable universal joint. In the special discharge device for power capacitors, there is a resistance - discharge grounding end at the first adjustable universal joint from top to bottom. The other end of the resistance - discharge component is connected to the resistance - discharge grounding end. One end of the grounding wire is connected to the resistance - discharge grounding end, and the other end of the grounding wire is connected to the grounding terminal clip. The hand - held insulating handle is sleeved on the lower end of the telescopic insulating rod.

[0010] The present invention has the following beneficial effects: The charge in the capacitor is released more thoroughly, the personal safety of power workers is ensured, the operation of related equipment is safer, and the man - hours for capacitor maintenance work are shortened. Description of the Drawings

[0011] Figure 1 It is a schematic structural diagram of the whole of the present invention.

[0012] Figure 2 Schematic diagram of the structure of the short-circuit telescopic rod used in the present invention.

[0013] Figure 3 Schematic diagram of the structure of the first contact rod connection used in the present invention.

[0014] Figure 4 Schematic diagram of the structure of the second contact rod connection used in the present invention.

[0015] Figure 5 Schematic diagram of the structure of the short-circuit grounding wire used in the present invention.

[0016] Figure 6 Schematic diagram of the structure of the telescopic insulating rod used in the present invention.

[0017] Figure 7 Schematic diagram of the structure of the hand-held insulating handle used in the present invention.

[0018] In the figure: 1 - short-circuit telescopic rod, 2 - first contact rod, 3 - short-circuit grounding wire, 4 - second contact rod, 5 - impedance release component, 6 - impedance release grounding end, 7 - adjustable universal joint, 8 - telescopic insulating rod, 9 - hand-held insulating handle, 11 - short-circuit telescopic rod tube body, 12 - telescopic spring, 13 - telescopic rod body, 14 - adjusting knob, 15 - upper connection end of the short-circuit telescopic rod, 16 - lower connection end of the short-circuit telescopic rod, 20 - first connection body, 21 - first contact rod body, 22 - first contact head, 41 - second contact rod body, 42 - second contact head, 411 - connection end of the second contact rod body, 30 - short-circuit grounding wire body, 31 - first end of the short-circuit grounding wire, 32 - second end of the short-circuit grounding wire, 91 - anti-slip component of the hand-held insulating handle. Detailed implementation manners

[0019] Please refer to Figures 1 to 7, a special discharge device for power capacitors, comprising a short - circuit component, an insulating grip component, a grounding component, and an adjustable universal joint 7. It is characterized in that the short - circuit component consists of a short - circuit telescopic rod 1, a finger - contact part, and a finger - contact connecting part 3. The short - circuit telescopic rod 1 has a short - circuit telescopic rod body 11, inside which there is a telescopic spring 12 and a telescopic rod body 13. The telescopic rod body 13 is connected to the inner top and bottom ends of the short - circuit telescopic rod body 11. The telescopic spring 12 is sleeved on the telescopic rod body 13. The upper connection end 15 of the short - circuit telescopic rod is located at the top of the short - circuit telescopic rod body 11, and the lower connection end 16 of the short - circuit telescopic rod is located at the bottom of the short - circuit telescopic rod body 11. The adjusting knob 14 extends from the outside of the short - circuit telescopic rod body 11 into the telescopic rod body 13 and can slide up and down for adjustment. The finger - contact part includes a first contact rod 2 and a second contact rod 4. The finger - contact connecting part can also be called a short - circuit grounding wire. The first contact rod 2 consists of a first contact rod body 21 and a first contact head 22. The flat part of the first contact head 22 is connected to one end of the first contact rod body 21. The other end of the first contact rod body 21 is connected to the first connecting body 20. The upper connection end 15 of the short - circuit telescopic rod is connected to the first connecting body 20. The short - circuit telescopic rod 1 is perpendicular to the first contact rod body 21. The second contact rod 4 consists of a second contact rod body 41 and a second contact head 42. The flat part of the second contact head 42 is connected to one end of the second contact rod body 41. The other end of the second contact rod body 41 is connected to the second connecting body. The lower connection end 16 of the short - circuit telescopic rod is connected to the second connecting body. The short - circuit telescopic rod 1 is perpendicular to the second contact rod body 41. The axes of the first contact rod body 21 and the second contact rod body 41 are in the same plane. The finger - contact connecting part 3 consists of a short - circuit grounding wire body 30. The short - circuit grounding wire body 30 is a spiral structure. The upper end of the short - circuit grounding wire body 30 is the first end 31 of the short - circuit grounding wire, and the lower end of the short - circuit grounding wire body 30 is the second end 32 of the short - circuit grounding wire. The first end 31 of the short - circuit grounding wire is connected to the first connecting body 20, and the second end 32 of the short - circuit grounding wire is connected to the second connecting body. The insulating grip component consists of a telescopic insulating rod 8 and a hand - held insulating handle 9. The grounding component consists of a resistance - discharge component 5, a grounding wire, and a grounding terminal clamp. The resistance - discharge component 5 is located inside the telescopic insulating rod 8. One end of the resistance - discharge component 5 is connected to the second end 32 of the short - circuit grounding wire. The telescopic insulating rod 8 has multiple sections and adjacent sections are connected by an adjustable universal joint 7. In the special discharge device for power capacitors, there is a resistance - discharge grounding end 6 at the first adjustable universal joint 7 from top to bottom. The other end of the resistance - discharge component 5 is connected to the resistance - discharge grounding end 6. One end of the grounding wire is connected to the resistance - discharge grounding end 6, and the other end of the grounding wire is connected to the grounding terminal clamp. The hand - held insulating handle 9 is sleeved on the lower end of the telescopic insulating rod 8.

[0020] A dedicated discharge device for power capacitors as described above, characterized in that the short-circuit telescopic rod 1 is a spring-damping telescopic rod, with a telescopic range greater than 5 cm and a damping less than 3 N when extended by 5 cm; the preferred length of the spring-damping telescopic rod is 10 m.

[0021] A dedicated discharge device for power capacitors as described above, characterized in that the shape of the first contact head is spherical.

[0022] A dedicated discharge device for power capacitors as described above, characterized in that the shape of the second contact head is spherical.

[0023] A dedicated discharge device for power capacitors as described above, characterized in that the material of the finger part is preferably copper.

[0024] A dedicated discharge device for power capacitors as described above, characterized in that the finger connection part is a spiral short wire, with a contact resistance less than 40 uΩ.

[0025] A dedicated discharge device for power capacitors as described above, characterized in that the extended length of the telescopic insulating rod 8 is greater than 1.5 m and the retracted length is less than 0.7 m.

[0026] A dedicated discharge device for power capacitors as described above, characterized in that the material of the telescopic insulating rod 8 is an epoxy resin insulating tube, and the withstand voltage strength of the insulating rod is greater than 42 kV.

[0027] A dedicated discharge device for power capacitors as described above, characterized in that the handheld part is a threaded finger straight handle, with a protective ring on the handheld part, and the displacement of the handheld part is less than 2 mm under a 100 N tensile force.

[0028] A dedicated discharge device for power capacitors as described above, characterized in that the material of the handheld insulating handle 9 is insulating rubber.

[0029] A dedicated discharge device for power capacitors as described above, characterized in that the discharge resistance component 5 is composed of multiple color ring resistors connected in series, the discharge time of a single capacitor is less than 6 s and all ring resistors do not heat up significantly.

[0030] A dedicated discharge device for power capacitors as described above, characterized in that the grounding wire part is detachable and made of soft copper wire, and the length of the grounding wire of the grounding wire part is greater than 3 m.

[0031] A dedicated discharge device for power capacitors as described above, characterized in that the grounding terminal clamp is pliers-type, with a contact resistance less than 1 mΩ.

[0032] A special discharge device for power capacitors as described above is characterized in that when the special discharge device for power capacitors is used for discharging a single capacitor, the short-circuit time of a single capacitor is less than 8 s.

[0033] In this invention, the applicant has conducted a large number of tests, mainly as follows.

[0034]

[0035] The applicant also conducted on-site inspections and records of the radius of the high-voltage terminal post of a single capacitor and the installation spacing between two capacitors. The conclusions are as follows: the radius range of the high-voltage terminal post of the capacitor is 6 cm - 8 cm, and the gap distance range between two adjacent capacitors is 20 cm - 26 cm. When discharging and wiring, in order to meet the actual working needs on site, the contact fingers of the discharge tool need to be in good contact with the terminal post of the capacitor and not easily fall off. Finally, it is determined that the length of the contact finger should be 10 cm. Finally, it is confirmed that using copper material and making the contact finger part with a spherical head shape of 10 cm in length has the best effect.

[0036] The applicant also conducted the following test: when using a spiral short wire to connect the upper and lower contact fingers, the spiral short wire and the spring-damping telescopic short circuit rod are assembled. To ensure that the contact resistance meets the target requirements during stretching, 10 contact resistance tests of the spiral short wire connecting the upper and lower contact fingers are now carried out, and the connected part is stretched to 5 cm.

[0037]

[0038] When the spiral short wire is in the telescopic state, the measured contact resistance values are all within 40 μΩ.

[0039] When the applicant uses epoxy resin material to make the insulating rod, in order to verify its insulation reliability, a voltage withstand test is now carried out on it. A voltage of 42 kV is applied to the insulating rod and maintained for one minute, and the following results are obtained.

[0040]

[0041] The applicant conducts a tensile shedding test on the rubber with a threaded finger straight handle shape for the handheld part to verify the friction force. The total weight of this discharge tool is 5 kg. Considering a 4-fold margin, the test target is that under a tensile force of 100 N, the sealing displacement is less than 2 mm. The test method is as follows: place the insulating rod with the threaded finger straight handle insulating rubber handheld part horizontally and fix the insulating rod. Use a precision spring scale to repeatedly pull the threaded finger straight handle insulating rubber 25 times. If the sealing displacement is less than 2 mm, it is qualified. Conduct 10 tests by changing the tensile force size.

[0042]

[0043] From the tensile test data, it can be seen that during the test, the displacement of the handheld part did not exceed 2 mm. Therefore, the handheld part made of threaded straight handle insulating rubber is qualified.

[0044] The applicant selected a color ring resistor combination to make the grounding resistor discharge of the discharge tool. In order to verify whether the grounding resistor discharge part made of the color ring resistor combination meets the discharge requirements, a discharge test was carried out on the on-site capacitor bank according to the manufactured discharge tool. The test method is as follows: Select a single capacitor with a capacity of 334 kVar. Connect the color ring resistor combination and the ammeter in series between the two terminals of the capacitor. Charge it with a 5 kV insulation megger for 1 minute. After removing the insulation megger, close the knife switch and record the time when the ammeter pointer deflects to zero, then the discharge time of the capacitor can be obtained. The color ring resistor combination part is composed of 5 individual color ring resistors. By changing the resistance value, the following test results are obtained.

[0045]

[0046] From the discharge data in the above table, it can be seen that when the resistance value of the color ring resistor combination is too small, the resistor will heat up and be damaged during the discharge process, and even cause the internal fuse of the capacitor to burn out; when the resistance value of the color ring resistor combination is too large, the discharge time will be too long. Based on this test, the resistance value of the color ring resistor combination is determined to be 37.5 MΩ. According to the principle of the discharge tool, draw the circuit board diagram based on the circuit diagram, process the circuit board, and solder components on the circuit board. The color ring resistor combination is composed of multiple color ring resistors connected in series. Its characteristics are convenient disassembly, can be combined into different resistance values, and has the advantages of low cost and long service life. By measuring the resistance of the manufactured color ring resistor combination circuit board and conducting a discharge test, the following records are obtained.

[0047]

[0048] From the above resistance measurement results, it can be seen that the finished product of the manufactured color ring resistor combination circuit board meets the standards.

[0049] The applicant uses a 16-square millimeter multi-strand soft copper wire with yellow and green stripes to make the grounding wire of the discharge rod. Considering using a detachable nut to assemble the soft copper wire and the insulating rod and selecting the optimal grounding wire length, a on-site survey of the maximum distance between the upper terminal of the capacitor and the grounding end is now carried out. From the on-site survey data, it is known that the maximum distance between the upper terminal of each capacitor and the grounding end is greater than 3 m. Therefore, the selected length of the grounding wire should be greater than 3 m. Considering the actual on-site work needs and the convenience of storage, the final length of the detachable grounding wire made is 4 m.

[0050] The applicant conducted tests on the discharge device in the present invention. The assembled discharging tool for each 10 kV capacitor was carried to the 110 kV Qianjin Substation for on-site testing. At the site of the 10 kV capacitor bank in the substation, 10 tests were conducted on the short-circuit time of each single capacitor using this tool. The target value for the short-circuit time of each single capacitor being less than 8 s was considered qualified. After using the discharging tool for each 10 kV capacitor, the average full discharge time for each capacitor in the 10 kV capacitor bank was 4 minutes and 36 seconds, which was less than the target value of 5 minutes. The goal within 5 minutes of the target value was achieved.

[0051] The principle of the present invention is as follows: Since a capacitor has two pole bushings, to fully discharge it, the two pole bushings of the capacitor must be short-circuited to the ground simultaneously. However, the conventional test discharge rod can only meet the requirement of single-pole grounding and cannot make reliable contact, resulting in incomplete discharge. Through re-design, due to the different standard sizes of the distances between the two pole bushings of capacitors from different manufacturers, in order for this device to cover all capacitors, the top of the discharge rod in the present invention is modified into a telescopic and adjustable spring pull rod. The adjustment range of the spring pull rod is obtained by measuring the sizes of various capacitors and converting them into a standard size that can accommodate all capacitors. Two discharge contact rods made of brass are installed at both ends of the pull rod. The directions and vertical positions of the contact rods are designed to be adjustable and lockable. To solve the problem of poor direct contact between the discharge rod and the capacitor bushing, the two-pole discharge contact rods are reliably clamped towards the middle with the two-pole contacts of the capacitor under test by the tensile force of the spring. It is verified through measuring the resistance that the clamping force meets the requirement of good contact. Since there is a spring pull rod between the two contact rods, considering that the connection of the spring pull rod may be unreliable and the contact resistance may be too large, which may cause incomplete short-circuiting of the two pole bushings of the capacitor, a 30-square-millimeter spring-type grounding wire is additionally installed between the two contact rods. When the spring pull rod is adjusted, the length of the grounding wire is automatically adjusted accordingly, enabling reliable short-circuiting between the two poles of the capacitor. For the grounding end of the discharge device, a resistor is installed inside the insulating rod to limit the short-circuit discharge current, prevent the generation of electric arcs, and protect the equipment from being damaged.

[0052] The differences between this application and 200520031258.4 are that this discharge rod is specifically invented for single-capacitor discharge of 10KV capacitor banks, and the discharge head of the discharge rod is telescopic and adjustable, and discharges while contacting both poles of the capacitor bank. The differences between this application and 201310519384.3 are that the discharge head of this discharge rod is designed with telescopic clamping, which can clamp both poles of the capacitor, so that the discharge rod can contact the conductors at both poles of the capacitor, and the discharge is more sufficient. The differences between this application and 201721047677.6 are that the distance between the two discharge heads of this discharge rod has two adjustable states, which can adapt to various models and specifications of capacitors. If the adjustable range of the internal spring rod is exceeded, the maximum range can also be adjusted by the locking bolt of the first discharge head at the end. And for capacitor discharge, it is required that the two poles are short-circuited first and then grounded, while one pole of the 7-position discharge rod in 201721047677.6 has been grounded first, which does not meet the discharge requirements. The differences between this application and 202021138042.9 are that the adjustment part of this patent does not need to disassemble the bolt for locking, and the clamping force on the two poles of the capacitor through the spring rod has the function of ensuring good contact and not easy to slip.

[0053] This application mainly has the following beneficial technical effects: After applying this application, the capacitor bank can be discharged multiple times one by one more thoroughly, and the charges in the capacitor are completely discharged, effectively ensuring the personal safety of power workers and avoiding the harm of residual charges, so personal safety is ensured; This application ensures the safe operation of related equipment. By means of a discharge resistor, the discharge current is prevented from being too large during the discharge process, which may damage the capacitor, so the equipment is safer; This application shortens the man-hours for capacitor maintenance work. After using the new tool, the full discharge time of each 10kV capacitor bank is shortened to 5 minutes, saving 70% of the time compared with the previous discharge duration.

[0054] The above embodiments are only the preferred technical solutions of the present invention, and should not be regarded as limitations on the present invention. The protection scope of the present invention should be the technical solutions recorded in the claims, including the equivalent replacement solutions of the technical features in the technical solutions recorded in the claims. That is, the equivalent replacement improvements within this scope are also within the protection scope of the present invention.

Claims

1. A special discharge device for power capacitors, which has a short-circuit component, an insulating grip component, a grounding component, and an adjustable universal joint (7), is characterized in that The short-circuit component is composed of a short-circuit telescopic rod (1), a finger contact part, and a finger contact connection part (3). The short-circuit telescopic rod (1) has a short-circuit telescopic rod body (11). Inside the short-circuit telescopic rod body (11), there is a telescopic spring (12) and a telescopic rod body (13). The telescopic rod body (13) is connected to the inner top and bottom ends of the short-circuit telescopic rod body (11). The telescopic spring (12) is sleeved on the telescopic rod body (13). The upper connection end (15) of the short-circuit telescopic rod is located at the top end of the short-circuit telescopic rod body (11), and the lower connection end (16) of the short-circuit telescopic rod is located at the bottom end of the short-circuit telescopic rod body (11). The adjusting knob (14) extends from the outside of the short-circuit telescopic rod body (11) into the telescopic rod body (13) and can be adjusted up and down. The finger contact part includes a first contact rod (2) and a second contact rod (4). The finger contact connection part can also be called a short-circuit grounding wire. The first contact rod (2) is composed of a first contact rod body (21) and a first contact head (22). The flat part of the first contact head (22) is connected to one end of the first contact rod body (21). The other end of the first contact rod body (21) is connected to the first connection body (20). The upper connection end (15) of the short-circuit telescopic rod is connected to the first connection body (20). The short-circuit telescopic rod (1) is perpendicular to the first contact rod body (21). The second contact rod (4) is composed of a second contact rod body (41) and a second contact head (42). The flat part of the second contact head (42) is connected to one end of the second contact rod body (41). The other end of the second contact rod body (41) is connected to the second connection body. The lower connection end (16) of the short-circuit telescopic rod is connected to the second connection body. The short-circuit telescopic rod (1) is perpendicular to the second contact rod body (41). The axis of the first contact rod body (21) and the axis of the second contact rod body (41) are in the same plane. The finger contact connection part (3) is composed of a short-circuit grounding wire body (30). The short-circuit grounding wire body (30) is a spiral structure. The upper end of the short-circuit grounding wire body (30) is the first end (31) of the short-circuit grounding wire, and the lower end of the short-circuit grounding wire body (30) is the second end (32) of the short-circuit grounding wire. The first end (31) of the short-circuit grounding wire is connected to the first connection body (20), and the second end (32) of the short-circuit grounding wire is connected to the second connection body. The insulating grip component is composed of a telescopic insulating rod (8) and a hand-held insulating handle (9). The grounding component is composed of a resistance and discharge component (5), a grounding wire, and a grounding terminal clamp.The discharge resistor component (5) is located inside the retractable insulating rod (8). One end of the discharge resistor component (5) is connected to the second end (32) of the short-circuit grounding wire. The retractable insulating rod (8) has multiple sections, and adjacent sections are connected by an adjustable universal joint (7). In the special discharge device for power capacitors, there is a discharge resistor grounding end (6) at the first adjustable universal joint (7) from top to bottom. The other end of the discharge resistor component (5) is connected to the discharge resistor grounding end (6). One end of the grounding wire is connected to the discharge resistor grounding end (6), and the other end of the grounding wire is connected to the grounding end clamp. The handheld insulating handle (9) is sleeved at the lower end of the retractable insulating rod (8); the material of the handheld insulating handle (9) is insulating rubber; the discharge resistor component (5) is composed of multiple color ring resistors connected in series, the discharge time of a single capacitor is less than 6 s, and all ring resistors do not heat up significantly.

2. The special discharge device for power capacitors according to claim 1, characterized in that The short-circuit telescopic rod (1) is a spring-damping telescopic rod, with a telescopic range greater than 5 cm and a damping less than 3 N when extended by 5 cm.

3. The special discharge device for power capacitors according to claim 2, characterized in that The shape of the first contact head is spherical, and the shape of the second contact head is spherical.

4. The special discharge device for power capacitors according to claim 3, characterized in that The finger connection part is a spiral short wire, with a contact resistance less than 40 uΩ.

5. The dedicated discharge device for power capacitors according to claim 4, characterized in that The extended length of the telescopic insulating rod (8) is greater than 1.5 m, and the contracted length is less than 0.7 m.

6. The dedicated discharge device for power capacitors according to claim 5, characterized in that The material of the telescopic insulating rod (8) is an epoxy resin insulating tube, and the voltage withstand strength of the insulating rod is greater than 42 kV.

7. The dedicated discharge device for a power capacitor according to claim 6, characterized in that The handheld part is a threaded finger straight handle, with a protective ring. When subjected to a 100 N tensile force, the displacement of the handheld part is less than 2 mm.

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