An insulating pull rod segmented voltage test device

Abstract

The present invention provides a device for segmented withstand voltage testing of insulating rods, comprising: a cylinder; a sealing plate fixed to one end of the cylinder; an insulating partition fixed to the other end of the cylinder, the insulating partition being provided with a central conductor; a high-voltage side assembly disposed within the cylinder and adjacent to the insulating partition, the high-voltage side assembly being electrically connected to the central conductor, the high-voltage side assembly including a high-voltage break shielding ring having a first through-hole for the insulating rod to pass through and to contact and guide the insulating rod; and a low-voltage side assembly disposed within the cylinder and adjacent to the sealing plate, the low-voltage side assembly including a direct-acting power output mechanism including a power source and a direct-acting output end. The direct-acting output end is fixed to the insulating rod to drive the insulating rod to move linearly, thereby changing its contact position with the high-voltage break shielding ring. The present invention allows segmented withstand voltage testing of the insulating rod by moving the insulating rod, thereby verifying the entire insulating rod and facilitating the assessment of its reliability.

Description

Technical Field

[0001] The invention relates to the technical field of insulating pull rod withstand voltage test devices, in particular to an insulating pull rod segmented withstand voltage test device. Background Art

[0002] Insulating rods electrically insulate the live parts of SF6 gas-enclosed combination electrical devices (especially the arc extinguishing chamber of a circuit breaker) from the grounded housing and operating mechanism, carrying the high-capacity current required for breaking and closing. To ensure their reliability, insulating rods must undergo insulation withstand voltage testing. Currently, one method involves installing the insulating rods in the product for factory withstand voltage testing. This method is inefficient, requiring only one test piece at a time, with a limited scope and low assessment level. This testing method can mask certain defects in the insulating rods themselves, and any defects that arise require rework of the entire product.

[0003] Another current method is to install the insulating rod in a voltage withstand test device for a voltage withstand test. For example, Chinese invention patent application publication number CN103353574A discloses an insulation test device for insulating rods for GIS. The device includes a cylindrical housing with an upper cover plate fixed at the upper end and an insulating partition (i.e., a pot-type insulator) fixed at the lower end. A lower support seat (i.e., the central conductor of the pot-type insulator) is provided in the middle of the insulating partition. A low-voltage shielding cover and an upper support seat located within the low-voltage shielding cover are fixed to the upper cover plate. A high-voltage shielding cover and a high-voltage contact conductor located within the high-voltage shielding cover are fixed to the pot-type insulator. The insulating rod is connected between the high-voltage contact conductor and the upper support seat via a metal connector. A high-voltage power supply is used to apply lightning impulse voltage withstand tests, power frequency voltage withstand tests, and partial discharge tests through the central conductor on the pot-type insulator.

[0004] The high-voltage contact conductor of the above-mentioned test device is connected to one end of the insulating pull rod. Therefore, the electric field test can only be performed on part of the insulating pull rod. The entire insulating pull rod cannot be verified, and the reliability of the insulating pull rod cannot be fully understood. Summary of the Invention

[0005] The object of the present invention is to provide an insulating pull rod segment withstand voltage test device which can perform withstand voltage test on the insulating pull rod segment, thereby understanding the reliability of the entire insulating pull rod.

[0006] To achieve the above objectives, the insulating pull rod segmented voltage test device of the present invention adopts the following technical solutions:

[0007] An insulating pull rod segmented withstand voltage test device, comprising:

[0008] Cylinder;

[0009] A sealing plate is fixed to one end of the cylinder;

[0010] An insulating partition is fixed to the other end of the cylinder and, together with the sealing plate, encloses the cylinder into a closed chamber. A central conductor for connecting to an external high-voltage power supply is provided on the insulating partition.

[0011] A high-voltage side assembly is disposed in the cylinder and is located on a side close to the insulating partition. The high-voltage side assembly is electrically connected to the central conductor and includes a high-voltage break shielding ring. The high-voltage break shielding ring is provided with a first through-hole for the insulating pull rod to pass through and to contact and guide the insulating pull rod.

[0012] The low-voltage side assembly is arranged in the cylinder and is located on the side close to the sealing plate. The low-voltage side assembly includes a direct-acting power output mechanism. The direct-acting power output mechanism includes a power source and a direct-acting output end. The direct-acting output end is provided with a fixing structure for fixing the insulating pull rod, so that the direct-acting output end drives the insulating pull rod to move linearly, thereby changing the contact position between the insulating pull rod and the high-voltage fracture shielding ring.

[0013] The beneficial effects of the above technical solution are: the low-voltage side assembly includes a direct-acting power output mechanism, the direct-acting output end of the direct-acting power output mechanism can fix the insulating pull rod and drive the insulating pull rod to move linearly; the high-voltage side assembly is provided with a first through-hole on the high-voltage break shielding ring, which can be used for the insulating pull rod to pass through and cooperate with the insulating pull rod contact guide, so that the insulating pull rod can move along the first through-hole, thereby changing the contact position with the high-voltage break shielding ring; and the entire high-voltage side assembly is electrically connected to the center conductor, so the contact position between the insulating pull rod and the high-voltage break shielding ring is the pressurized position, so that the electric field at any position of the insulating pull rod can be assessed by moving the insulating pull rod, and the entire insulating pull rod is verified, which is equivalent to performing a withstand voltage test on the insulating pull rod in sections, thereby facilitating the grasp of the reliability of the entire insulating pull rod.

[0014] Furthermore, in order to facilitate the configuration of the direct-acting power output mechanism, the direct-acting power output mechanism is a screw-nut transmission mechanism, the power source is a motor, the output end of the motor is connected to a screw, the direct-acting output end is a positioning plate threadedly connected to the screw, and the screw-nut transmission mechanism also includes a guide rod that passes through the positioning plate and guides the positioning plate.

[0015] Furthermore, in order to facilitate the setting of the fixing structure, a second through-hole is provided on the positioning plate for the end of the insulating pull rod to pass through. The fixing structure is a tightening bolt threadedly connected to the positioning plate, and the end of the tightening bolt is used to extend into the second through-hole to fix the insulating pull rod.

[0016] Furthermore, in order to facilitate the fixation of the insulating pull rod, a connecting sleeve is embedded in the end of the insulating pull rod. The insulating pull rod segmented pressure test device also includes a positioning block for inserting into the connecting sleeve, and the tightening bolt is used to press on the positioning block.

[0017] Furthermore, in order to increase the number of insulating pull rods and improve test efficiency, at least two second through-holes are provided, and the plurality of second through-holes are evenly distributed along the circumference of the positioning plate.

[0018] Furthermore, in order to facilitate the installation of the motor and simulate the actual working conditions of the insulating pull rod, the low-voltage side assembly also includes a fixed plate, which is fixed on the sealing plate. The fixed plate is provided with a motor bracket for installing the motor. One end of the guide rod is fixed on the fixed plate and the other end is fixed with a low-voltage fracture shielding ring. The low-voltage fracture shielding ring is provided with a third through-hole for the insulating pull rod to pass through and to contact and guide with the insulating pull rod.

[0019] Furthermore, in order to improve the shielding effect and simulate the actual working condition of the insulating pull rod, a low-voltage shielding cover is fixed to the outside of the low-voltage fracture shielding ring.

[0020] Furthermore, in order to improve the shielding effect and simulate the actual working condition of the insulating pull rod, a first high-voltage shielding cover is fixed to the outside of the high-voltage fracture shielding ring.

[0021] Furthermore, in order to facilitate the guidance of the insulating pull rod, the high-voltage side assembly also includes a support tube, the high-voltage fracture shielding ring is fixed at one end of the support tube, and a guide plate is provided in the support tube for guiding the insulating pull rod after the insulating pull rod enters the support tube, and a fourth through-hole is provided on the guide plate for the insulating pull rod to pass through.

[0022] Furthermore, in order to facilitate the electrical connection between the support tube and the center conductor and improve the shielding effect, the support tube is electrically connected to the center conductor through a high-voltage conductor, and a second high-voltage shielding cover is fixed at the connection position between the high-voltage conductor and the support tube, and a third high-voltage shielding cover is fixed at the connection position between the high-voltage conductor and the center conductor. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 Schematic diagram of the structure of the insulation pull rod segmented withstand voltage test device of the present invention;

[0024] Figure 2 A side view of the positioning plate of the insulating pull rod segmented withstand voltage test device of the present invention;

[0025] Figure 3 A side view of a high-voltage fracture shielding ring of the insulating pull rod segmented withstand voltage test device of the present invention;

[0026] Figure 4 This is a structural diagram of the first test state of the insulating pull rod segmented withstand voltage test device of the present invention;

[0027] Figure 5 This is a structural diagram of the second test state of the insulating pull rod segmented withstand voltage test device of the present invention;

[0028] Figure 6 This is a structural diagram of the third test state of the insulating pull rod segmented withstand voltage test device of the present invention;

[0029] Figure 7 This is a structural diagram of the fourth test state of the insulating pull rod segmented voltage test device of the present invention.

[0030] In the figure: 1-insulating partition; 2-center conductor; 3-third high-voltage shielding cover; 4-high-voltage conductor; 5-second high-voltage shielding cover; 6-support tube; 7-guide plate; 8-cylinder; 9-first high-voltage shielding cover; 10-high-voltage fracture shielding ring; 101-first perforation; 11-low-voltage shielding cover; 12-low-voltage fracture shielding ring; 13-insulating pull rod; 131-connecting sleeve; 14-positioning plate; 141-nut sleeve; 15-guide rod; 16-screw; 17-motor; 18-sealing plate; 19-fixing plate; 20-motor bracket; 21-positioning block; 22-tightening bolt. DETAILED DESCRIPTION

[0031] In order to make the objectives, technical solutions, and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present invention and are not intended to limit the present invention. That is, the embodiments described herein are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and illustrated in the drawings herein may be arranged and designed in various different configurations.

[0032] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but is merely intended to represent selected embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative work are within the scope of protection of the present invention.

[0033] It should be noted that relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus comprising the element.

[0034] The features and performance of the present invention are further described in detail below with reference to the embodiments.

[0035] An embodiment of the insulating pull rod segmented withstand voltage test device (hereinafter referred to as the test device) of the present invention is as follows Figure 1 As shown, the test apparatus includes a cylinder 8, which is horizontally positioned in this embodiment. An insulating partition 1 is fixed to the left end of the cylinder 8. A central conductor 2 for connecting to an external high-voltage power supply is mounted on the insulating partition 1. In practice, the insulating partition 1 and the central conductor 2 form a pot-type insulator. A sealing plate 18 is fixed to the right end of the cylinder 8. Together, the sealing plate 18 and the insulating partition 1 enclose the cylinder 8 to form a closed chamber. This chamber is then filled with sulfur hexafluoride gas at a specified pressure prior to testing.

[0036] The test apparatus also includes a high-voltage side assembly disposed within the cylinder 8, located near the insulating partition 1. The high-voltage side assembly includes a high-voltage conductor 4, a support cylinder 6, and a high-voltage fracture shielding ring 10. One end of the high-voltage conductor 4 is fixedly connected to the center conductor 2, and the other end is fixedly connected to the left end of the support cylinder 6. To improve the shielding effect, a second high-voltage shielding cover 5 is fixed to the connection between the high-voltage conductor 4 and the support cylinder 6, and a third high-voltage shielding cover 3 is fixed to the connection between the high-voltage conductor 4 and the center conductor 2.

[0037] The high voltage break shielding ring 10 is fixed to the right end of the support tube 6. A first high voltage shielding cover 9 is fixed to the outside of the high voltage break shielding ring 10 to improve the shielding effect and simulate the actual working condition of the insulating pull rod. The high voltage break shielding ring 10 is electrically connected to the center conductor 2 through the support tube 6 and the high voltage conductor 4. Figure 3 As shown, the high-voltage break shielding ring 10 is provided with a first through-hole 101 for the insulating rod 13 to pass through and to contact and guide the insulating rod 13 . There are four first through-holes 101 and they are evenly distributed along the circumference of the high-voltage break shielding ring 10 .

[0038] The test device also includes a low-pressure side assembly arranged in the cylinder 8, and the low-pressure side assembly is located on the side close to the sealing plate 18. The low-pressure side assembly includes a direct-acting power output mechanism, and the direct-acting power output mechanism includes a power source and a direct-acting output end. The direct-acting output end is provided with a fixing structure for fixing the insulating pull rod 13, so that the direct-acting output end drives the insulating pull rod 13 to move linearly, thereby changing the contact position of the insulating pull rod 13 and the high-voltage fracture shielding ring 10.

[0039] Specifically, in this embodiment, the direct-acting power output mechanism is a screw-nut transmission mechanism, the power source is a motor 17, the output end of the motor 17 is connected to the screw 16, and the direct-acting output end is a positioning plate 14 threadedly connected to the screw 16. The screw-nut transmission mechanism also includes a guide rod 15 that passes through the positioning plate 14 and guides the positioning plate 14. Figure 2As shown, the guide rod 15 is a round rod, so two guide rods 15 are provided.

[0040] like Figure 2 As shown, a nut sleeve 141 is provided at the center of the positioning disk 14. The positioning disk 14 also includes a second through-hole (not shown) for the end of the insulating rod 13 to pass through. In this embodiment, the insulating rod 13 is a flat square rod, so the second through-hole and the aforementioned first through-hole 101 are both rectangular holes. Four second through-holes are provided and evenly distributed along the circumference of the positioning disk 14. A connecting sleeve 131 is embedded in the end of the insulating rod 13. After the end of the insulating rod 13 passes through the positioning disk 14, the connecting sleeve 131 fits snugly within the positioning disk 14. To facilitate securing the insulating rod 13, the test device of the present invention also includes a positioning block 21 that is inserted into the connecting sleeve 131. The securing structure is a tightening bolt 22 threadedly connected to the positioning disk 14. The end of the tightening bolt 22 is designed to extend into the second through-hole and press against the positioning block 21 to secure the insulating rod 13.

[0041] like Figure 1 As shown, the low-voltage side assembly also includes a fixing plate 19, which is fixed to the sealing plate 18 and is equipped with a motor bracket 20 for mounting the motor 17. One end of the guide rod 15 is fixed to the fixing plate 19, and the other end is fixed to the low-voltage fracture shielding ring 12. The low-voltage fracture shielding ring 12 is provided with a third through-hole (not shown) for the insulating tie rod 13 to pass through and contact and guide the insulating tie rod 13. Because the insulating tie rod 13 is placed horizontally, the low-voltage fracture shielding ring 12 also supports the insulating tie rod 13.

[0042] In order to improve the shielding effect and simulate the actual working condition of the insulating pull rod 13, a low-voltage shielding cover 11 is fixed on the outside of the low-voltage fracture shielding ring 12. Figure 1 As shown, a guide plate 7 is provided in the support tube 6 for guiding the insulating rod 13 after the insulating rod 13 enters the support tube 6 , and a fourth through-hole (not shown in the figure) is provided on the guide plate 7 for the insulating rod 13 to pass through.

[0043] When the test device of the present invention is used, Figure 4 As shown, the various components of the test device are assembled, and the insulating rod 13 is adjusted to just pass through the high-voltage fracture shielding ring 10. At this time, the insulating rod 13 is in the first test position. Before the test, SF6 gas at a specified pressure is filled into the chamber as an insulating medium. During the test, the center conductor 2 is connected to the external high-voltage power supply, the sealing plate 18 and the cylinder 8 are at zero potential, and the cylinder 8 is filled with SF6 gas at a rated pressure as insulation protection. The purpose of the insulating partition 1 is to separate the test device from the pressure port air chamber, dividing a small air chamber during the pressure test to shorten the vacuuming, filling and degassing time.

[0044] The present invention provides an environment for the insulating rod 13 that simulates actual operating conditions. Shielding components are installed on both the high- and low-voltage sides of the insulating rod 13. The shielding components are similar in size to the product, ensuring that the electric field distribution between the high- and low-voltage shields on the insulating rod is identical to the electric field distribution of the insulating rod under actual operating conditions. The test device of the present invention enables lightning impulse voltage withstand tests, 1-minute power frequency voltage withstand tests, and partial discharge measurement tests to be performed at a single test location.

[0045] After the first test position test is completed, the motor 17 drives the lead screw 16 to rotate, so that the positioning plate 14 moves to the left, and then the positioning plate 14 drives the insulating pull rod 13 to move to the left and extend into the support tube. Figure 5 As shown, the insulating rod 13 is in the second test position. After the test is completed, the insulating rod 13 is moved leftward to the position of the guide plate 7. At this time, the insulating rod 13 is in the third test position. Figure 6 After the test is completed, the insulating rod 13 is continued to move to the left through the guide plate 7, as shown. Figure 7 As shown, the fourth test position is tested.

[0046] The test device of the present invention uses a motor to drive the insulating rod to perform linear reciprocating motion, changing its contact position with the high-voltage fracture shielding ring. This test is not limited to the four test positions described above; in fact, the electric field at any position on the insulating rod can be assessed. The entire insulating rod is verified, achieving segmented withstand voltage testing of the entire rod, accurately reflecting internal and external defects at each position. Furthermore, the motor-driven method and the ability to perform withstand voltage tests on four insulating rods at once significantly improve the efficiency of insulating rod withstand voltage testing.

[0047] In addition, the test device of the present invention has a compact structure and occupies a small space, and can realize the segmented withstand voltage test of the insulating pull rod in a small gas chamber. There is no need to replace the gas or disassemble the test device. The withstand voltage test of the insulating pull rod can be carried out without shutting down the equipment, disassembling it, or replacing the SF6 gas.

[0048] In other embodiments of the insulating pull rod segmented voltage withstand test device, the support tube can be directly fixedly connected to the central conductor, thereby eliminating the high-voltage conductor.

[0049] In other embodiments of the insulating pull rod segmented voltage test device, the support tube may not be provided. For example, multiple support rods may be provided, one end of the support rod is fixedly connected to the high-voltage conductor and the other end is fixedly connected to the high-voltage fracture shielding ring.

[0050] In other embodiments of the insulating pull rod segmented withstand voltage test device, the first high-voltage shielding cover may not be provided, and the low-voltage shielding cover and the low-voltage fracture shielding ring may not be provided.

[0051] In other embodiments of the insulating pull rod segmented withstand voltage test device, the fixing plate and the motor bracket may not be provided, but a support frame may be fixed on the inner wall of the cylinder to support and fix the motor.

[0052] In other embodiments of the insulating rod segmented voltage test device, the connecting sleeve at the end of the insulating rod can be completely passed through the positioning plate. At this time, the tightening bolt directly presses the insulating rod, or in other words, no matter what the structure of the insulating rod is, the tightening bolt directly presses the insulating main body of the insulating rod.

[0053] In other embodiments of the insulating pull rod segmented withstand voltage test device, a threaded hole may be provided on the insulating pull rod, and in this case the fixing structure may be a fixing bolt passing through the positioning plate and threadedly connected to the insulating pull rod.

[0054] In other embodiments of the insulating pull rod segmented pressure test device, the direct-acting power output mechanism can also be a cylinder, a hydraulic cylinder or an electric push rod. At this time, in order to facilitate the fixed connection of the insulating pull rod, the direct-acting output end can be a fixed plate fixed on the piston rod of the cylinder, hydraulic cylinder or electric push rod. At this time, the fixing structure can be a top screw threadedly connected to the fixed plate.

[0055] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The scope of patent protection of the present invention shall be based on the claims. Any equivalent structural changes made using the description and drawings of the present invention shall be included in the scope of protection of the present invention.

Claims

1. An insulating pull rod segmented withstand voltage test device, characterized in that: include: Cylinder; A sealing plate is fixed to one end of the cylinder; An insulating partition is fixed to the other end of the cylinder and, together with the sealing plate, encloses the cylinder into a closed chamber. A central conductor for connecting to an external high-voltage power supply is provided on the insulating partition. A high-voltage side assembly is disposed in the cylinder and is located on a side close to the insulating partition. The high-voltage side assembly is electrically connected to the central conductor and includes a high-voltage break shielding ring. The high-voltage break shielding ring is provided with a first through-hole for the insulating pull rod to pass through and to contact and guide the insulating pull rod. The low-voltage side assembly is arranged in the cylinder and is located on the side close to the sealing plate. The low-voltage side assembly includes a direct-acting power output mechanism, which includes a power source and a direct-acting output end. The direct-acting output end is provided with a fixing structure for fixing the insulating pull rod, so that the direct-acting output end drives the insulating pull rod to move linearly, thereby changing the contact position between the insulating pull rod and the high-voltage fracture shielding ring; A fixing plate is fixed on the sealing plate, and the low-voltage side assembly also includes a guide rod, one end of the guide rod is fixed on the fixing plate, and the other end is fixed with a low-voltage fracture shielding ring. The low-voltage fracture shielding ring is provided with a third through-hole for the insulating pull rod to pass through and to contact and guide the insulating pull rod; a low-voltage shielding cover is fixed to the outside of the low-voltage fracture shielding ring, and a first high-voltage shielding cover is fixed to the outside of the high-voltage fracture shielding ring to simulate the actual working conditions of the insulating pull rod, so that the electric field distribution condition of the insulating pull rod between the high and low voltage side shielding parts is equivalent to the electric field distribution condition of the insulating pull rod in actual working conditions.

2. The insulating pull rod segmented withstand voltage test device according to claim 1, characterized in that: The direct-acting power output mechanism is a screw-nut transmission mechanism, the power source is a motor, the output end of the motor is connected to the screw, the direct-acting output end is a positioning plate threadedly connected to the screw, and the guide rod passes through the positioning plate and guides the positioning plate.

3. The insulating pull rod segmented withstand voltage test device according to claim 2, characterized in that: The positioning plate is provided with a second through-hole for the end of the insulating pull rod to pass through. The fixing structure is a tightening bolt threadedly connected to the positioning plate. The end of the tightening bolt is used to extend into the second through-hole to fix the insulating pull rod.

4. The insulating pull rod segmented withstand voltage test device according to claim 3, characterized in that: A connecting sleeve is embedded in the end of the insulating pull rod. The insulating pull rod segmented pressure test device also includes a positioning block for inserting into the connecting sleeve, and the tightening bolt is used to press on the positioning block.

5. The insulating pull rod segmented withstand voltage test device according to claim 3 or 4, characterized in that: There are at least two second through holes, and the plurality of second through holes are evenly distributed along the circumference of the positioning plate.

6. The insulating pull rod segmented withstand voltage test device according to any one of claims 2 to 4, characterized in that: A motor bracket for mounting the motor is provided on the fixing plate.

7. The insulating pull rod segmented withstand voltage test device according to any one of claims 1 to 4, characterized in that: The high-voltage side assembly also includes a support tube, the high-voltage fracture shielding ring is fixed at one end of the support tube, and a guide plate is provided in the support tube for guiding the insulating pull rod after the insulating pull rod enters the support tube. The guide plate is provided with a fourth through-hole for the insulating pull rod to pass through.

8. The insulating pull rod segmented withstand voltage test device according to claim 7, characterized in that: The support tube is electrically connected to the central conductor through a high-voltage conductor. A second high-voltage shielding cover is fixed to the connection position between the high-voltage conductor and the support tube, and a third high-voltage shielding cover is fixed to the connection position between the high-voltage conductor and the central conductor.

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