A closing resistor insulating tube insulation test tool and test method

Abstract

This invention discloses a testing fixture and method for insulation testing of a closing resistance insulating tube. The testing fixture includes a gas tank, a movable testing cart, a fixed backplate, multiple high-voltage shields and connecting plates, and a high-voltage conductor. The testing cart is movably installed inside the gas tank, the backplate is fixed to the testing cart, the connecting plates are used to connect the high-voltage shields as a whole, and the high-voltage conductor is electrically connected to all high-voltage shields to apply a test voltage. The testing method includes assembling the conductor, insulating tube, and high-voltage shield components on the backplate and interconnecting them; hoisting the assembly to the testing cart and pushing it into the gas tank to complete the high-voltage connection; filling the gas tank with insulating gas to a set pressure; applying a power frequency voltage and then reducing the voltage to start a partial discharge tester for partial discharge detection. The testing fixture and method of this invention, by placing the insulating tube horizontally and using a dedicated fixture structure, can achieve safe and efficient insulation performance testing.

Description

Technical Field

[0001] This invention relates to the field of high-voltage electrical technology, and in particular to a test fixture and corresponding test method for testing the insulation performance of a closing resistor insulation tube. Background Technology

[0002] In the production and testing of high-voltage electrical equipment, the insulation performance of the closing resistor insulation tube is a key indicator to ensure the safe operation of the equipment and must be verified through specialized insulation tests. Closing resistor insulation tubes are typically available in two specifications: long tubes (e.g., 1025mm in length) and short tubes.

[0003] Currently, insulation tests are mostly conducted in enclosed test tanks to simulate the actual operating environment of the equipment. However, existing test tanks have height limitations (e.g., 1110mm). For long closing resistor insulation tubes, if the traditional vertical placement method is used for testing, the insulation distance between the high-voltage end and the grounding end will be insufficient, making it easy for discharge to occur. This fails to meet the test requirements and seriously affects the safety and accuracy of the test.

[0004] Therefore, there is an urgent need for a tooling and method that can adapt to the space limitations of the test tank and realize reliable insulation testing of long-size closing resistor insulation tubes. Summary of the Invention

[0005] In view of the above-mentioned shortcomings in the current insulation testing of resistor insulation tubes, the purpose of this invention is to provide a technique for testing the insulation performance of closing resistor insulation tubes, which achieves safe and efficient insulation performance testing by placing the insulation tube horizontally and using a special tooling structure.

[0006] To achieve the above objectives, a first aspect of the present invention provides an insulation testing fixture for a closing resistor insulating tube, used for insulation testing of the closing resistor insulating tube, the fixture comprising:

[0007] A gas cylinder, inside which the closing resistor insulation tube is placed horizontally for insulation testing;

[0008] The test vehicle is movably installed inside the gas tank, and the closing resistor insulation tube is placed horizontally on the test vehicle;

[0009] A back plate is fixed to the test vehicle, and the closing resistor insulation tube is fixed to the back plate. The back plate serves as the tail support for the closing resistor insulation tube and is the low-voltage end.

[0010] High-voltage shielding, wherein there are multiple high-voltage shields and each high-voltage shield is correspondingly fastened to the free end of a closing resistor insulating tube;

[0011] A connecting plate, wherein there are multiple connecting plates, used to connect multiple high-voltage shields into one unit;

[0012] The high-voltage conductor, which is electrically connected to all the high-voltage shields, is used to apply the test voltage.

[0013] In some embodiments of the first aspect of this application, the closing resistor insulation tube insulation test fixture further includes a support mechanism, the support mechanism including a conductor fixed horizontally on the back plate and a fixed insulation tube sleeved on the conductor, and a high-voltage shield fastened to the free end of the fixed insulation tube.

[0014] In some embodiments of the first aspect of this application, one end of the conductor is connected to the back plate by bolts; the back plate is provided with a slot, and the closing resistor insulating tube and the fixing insulating tube are fixed to the back plate by being inserted into the slot.

[0015] In some embodiments of the first aspect of this application, the connecting plate includes a first connecting plate and a second connecting plate that are conductive. The first connecting plate is used to connect the high voltage shield on the fixed insulating tube to the high voltage shield on one of the closing resistor insulating tubes, and the second connecting plate is used to connect the high voltage shields on all the closing resistor insulating tubes.

[0016] In some embodiments of the first aspect of this application, the first connecting plate is provided with a first screw hole and a second screw hole, and the second connecting plate is provided with a third screw hole and a fourth screw hole;

[0017] The high-voltage shield fastened to the fixed insulating tube has a threaded hole, and the high-voltage shield fastened to the closing resistor insulating tube has a threaded hole.

[0018] During assembly: Align the first screw hole with the screw hole of the high voltage shield on the fixed insulating tube and screw in the bolt; align the second screw hole with one of the screw holes of the high voltage shield on one of the closing resistor insulating tubes and screw in the bolt; align the third and fourth screw holes with one of the screw holes of the high voltage shield on the two adjacent closing resistor insulating tubes respectively and screw in the bolts.

[0019] In some embodiments of the first aspect of this application, the second screw hole includes a recessed inner hole, and both the inner hole and the fourth screw hole are elongated to accommodate positional adjustments within a certain range.

[0020] In some embodiments of the first aspect of this application, the gas tank is cylindrical and the bottom of the gas tank is provided with an inner guide rail extending along its length; during testing, the gas tank is filled with SF6 insulating gas.

[0021] In some embodiments of the first aspect of this application, the closing resistor insulation tube insulation test fixture further includes an assembly vehicle, which is disposed outside the gas tank and has a ground guide rail that mates with the inner guide rail of the gas tank; the test vehicle is located on the assembly vehicle, and the bottom of the test vehicle is provided with a pulley that can slide along the inner guide rail of the gas tank and the ground guide rail of the assembly vehicle.

[0022] In some embodiments of the first aspect of this application, the high-voltage conductor is reliably contacted by a spring contact at its front end and a connecting plate at the free end of the fixed insulating tube. Both the connecting plate and the high-voltage shield are conductive structures. Multiple high-voltage shields are connected through the connecting plate and then electrically connected to the high-voltage conductor.

[0023] To achieve the above objective, a second aspect of the present invention provides a method for testing the insulation of a closing resistor insulating tube, the method comprising the following steps:

[0024] Step S1: Connect the conductor to the back plate with bolts, and insert the fixed insulating tube and the insulating tube of the closing resistor to be tested horizontally into the slot of the back plate. Fasten the high voltage shield at the free end of the fixed insulating tube and each closing resistor insulating tube, and connect multiple high voltage shields into one unit through the connecting plate.

[0025] Step S2: Hoist the assembled structure from step S1 onto the test vehicle, move the assembly vehicle to the gas tank, align the ground guide rail of the assembly vehicle with the inner guide rail of the gas tank, push the test vehicle into the appropriate position inside the gas tank, and align the high-voltage conductor with the connecting plate on the fixed insulating tube inside the gas tank.

[0026] Step S3: Close the tank door, evacuate the tank, and then fill it with insulating gas to the required test pressure.

[0027] Step S4: Apply power frequency voltage through the high-voltage conductor, then reduce it to the partial discharge test voltage, and turn on the partial discharge tester to perform partial discharge test.

[0028] The advantages of this invention are as follows: First, by placing long insulating tubes horizontally and using structures such as a large backplate and connecting plate, the limitation of vertical testing on the height of the test tank is overcome, solving the space limitation problem and enabling reliable insulation testing of long tubes. Second, the combination of high-voltage shielding and connecting plate ensures uniform electric field distribution during the test, avoiding test errors caused by local electric field concentration. The SF6 gas environment simulates the actual operating state of the equipment, and the test results are closer to reality. Third, the technical solution of this invention can test multiple insulating tubes simultaneously, which can significantly improve the testing efficiency of resistance insulation. Finally, the guide rail docking design between the assembly vehicle and the test vehicle facilitates the transportation and positioning of insulating tubes, making operation convenient, and the setting of spring contacts ensures the reliability of high-voltage connection. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a front view of the test fixture of the present invention;

[0031] Figure 2 This is a front view of the back plate of the present invention;

[0032] Figure 3 This is a schematic diagram of the structure of the first connecting plate of the present invention;

[0033] Figure 4 This is a schematic diagram of the structure of the second connecting plate of the present invention;

[0034] Figure 5 This is a cross-sectional view of the tail portion of the conductor of the present invention;

[0035] Figure 6 This is a cross-sectional view of the high-voltage end conductor of the present invention;

[0036] Figure 7 This is a cross-sectional view of the high-voltage shield of the present invention;

[0037] Figure 8 This is a schematic diagram of the structure of the experimental vehicle of the present invention;

[0038] Figure 9 This is a schematic diagram of the assembly vehicle of the present invention;

[0039] Figure 10 This is a schematic diagram of the internal structure of the gas tank after the experimental tooling of this invention has been completed;

[0040] Figure 11This is a partial enlarged view of the connection between the spring contact and the first connecting plate of the present invention;

[0041] Figure 12 This is a schematic diagram of the test method of the present invention.

[0042] Among them: 100, gas tank; 101, back plate; 102, high-voltage shield; 105, high-voltage end conductor; 106, closing resistor insulation tube; 107, slot; 108, conductor; 109, fixed insulation tube; 110, threaded hole; 111, through hole; 112, positioning post; 113, positioning hole; 114, spring contact; 115, tank door; 103a, first connecting plate; 103b, second connecting plate; 103a1, first screw hole; 103a2, second screw hole; 103b1, third screw hole; 103b2, fourth screw hole; 103a3, connecting plate body; 103a4, connecting plate handle; 200, test vehicle; 201, pulley; 300, assembly vehicle; 301, ground guide rail. Detailed Implementation

[0043] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0044] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, a closing resistor insulation tube insulation test fixture includes a gas tank 100, a back plate 101, a high-voltage shield 102, a connecting plate, a test vehicle 200, and a high-voltage end conductor 105.

[0045] The gas tank 100 allows the closing resistor insulation tube 106 to be placed horizontally for insulation testing. In this embodiment of the invention, the gas tank 100 is cylindrical. During testing, the cylindrical gas tank 100 is filled with SF6 insulating gas, and the bottom of the gas tank 100 is provided with two symmetrical guide rails extending along its length.

[0046] During assembly, the closing resistance insulation tube 106 to be tested is fixed on the back plate 101. The back plate 101 serves as the tail support for the closing resistance insulation tube 106 and is the low-voltage end. In this embodiment of the invention, the back plate 101 is provided with slots 107. There are multiple slots 107, and the size of the slots 107 is adapted to the diameter of the closing resistance insulation tube 106. The tail of the closing resistance insulation tube 106 can be inserted into the slot 107 to fix it on the back plate 101.

[0047] In this embodiment of the invention, the back plate 101 is fixed to the test vehicle 200, and the bottom of the test vehicle 200 is provided with a pulley 201, which can slide along the guide rail inside the cylindrical gas tank 100. After assembly, the test vehicle 200 is pushed to the corresponding position inside the cylindrical gas tank 100 along the guide rail. In this way, during testing, the closing resistor insulation tube 106 is placed horizontally inside the cylindrical gas tank 100, thereby avoiding the problem of dimensional limitations in the vertical direction.

[0048] To facilitate the fixing of the closing resistor insulation tube 106, in this embodiment of the invention, the closing resistor insulation tube test fixture has a support mechanism. The support mechanism includes a conductor and a fixed insulation tube 109. The conductor 108 is fixed on the back plate 101 to provide stable support for the test fixture. The fixed insulation tube 109 is sleeved on the outside of the conductor 108 to achieve electrical insulation. The fixed insulation tube 109 here can be a closed resistor insulation tube 106 that has passed the test.

[0049] In this embodiment of the invention, the conductor 108 is fixed to the back plate 101 by two bolts. Specifically, two threaded holes 110 are provided at one end of the conductor 108, and two corresponding through holes 111 are provided at corresponding positions on the back plate 101. In addition, for easy positioning, a positioning post 112 is provided between the two threaded holes on the conductor. The positioning post 112 is cylindrical and protrudes from the conductor 108. At the same time, a positioning hole 113 is provided between the two through holes on the back plate. During assembly, one end of the conductor is placed against the back plate, and the positioning post 112 is inserted into the positioning hole 113 by adjusting its position, aligning the threaded hole 110 and the through hole 111, and then the bolts are screwed in.

[0050] Meanwhile, a slot 107, which is adapted to the diameter of the fixed insulating tube 109, is provided on the back plate 101 around the positioning hole 113. It can be understood that the two through holes 111 on the back plate are located inside the circular plane enclosed by the slot 107 and are symmetrically positioned.

[0051] During assembly, the conductor 108 is first fixed to the back plate 101 with bolts, and then the fixed insulating tube 109 is inserted into the corresponding slot 107 on the back plate, thus completing the installation of the test fixture. At this time, the conductor 108 is located inside the fixed insulating tube 109, and the inner side of the fixed insulating tube 109 is tightly attached to the conductor 108, which provides both insulation and stable support for the insulating tube 106 of the closing resistance to be tested.

[0052] It is understood that the conductor 108, serving as a support mechanism, is fixed in a relatively central position on the back plate 101, and the fixed insulating tube 109 is sleeved on the conductor 108. During the test, the closing resistance insulating tube 106 to be tested is installed around the fixed insulating tube 109, with the fixed insulating tube 109 located in the middle. In this embodiment of the invention, five closing resistance insulating tubes 106 are installed around the fixed insulating tube 109, thus allowing the testing of all five closing resistance insulating tubes 105 to be completed at once, resulting in high testing efficiency.

[0053] In this embodiment of the invention, the conductor 108 and the fixed insulating tube 109, which serve as a support mechanism, can be fixed to the back plate 106 as part of the tooling, thus eliminating the need for disassembly during each test and improving testing efficiency.

[0054] Depending on the number of closing resistance insulation tubes 106 to be tested, there are multiple high-voltage shields 102 and connecting plates. Each closing resistance insulation tube 106 and the free end of the fixed insulation tube 109 is fastened with a high-voltage shield 102; the connecting plate is used to connect all the high-voltage shields 102 into one unit.

[0055] In this embodiment of the invention, as an important component of the test fixture, the high-voltage shield 102 can improve the electric field distribution at the end of the closing resistor insulation tube 106 during the test, avoid partial discharge or breakdown caused by electric field concentration, ensure the stability of the test process, reduce the interference of external factors on the insulation performance test of the insulation tube, and provide a stable electrical environment for the accurate test of the insulation performance of the closing resistor insulation tube 106.

[0056] Both the high-voltage shield 102 and the connecting plate are conductive structures. The connecting plate can connect multiple high-voltage shields 102 that are snapped onto the closing resistor insulation tube 106 into one, forming a unified high-voltage conductive path. Together with the high-voltage conductor 105, the test voltage is applied, so that all closing resistor insulation tubes 106 can withstand the test voltage at the same time, meeting the requirements of synchronous testing.

[0057] Combination Figure 3 and Figure 4 As shown in the embodiment of the present invention, the connecting plate can be divided into a first connecting plate 103a and a second connecting plate 103b. The first connecting plate 103a is a single plate used to connect the high-voltage shield 102 on the fixed insulating tube 109 to the high-voltage shield 102 on one of the closing resistor insulating tubes 106. The second connecting plates 103b are multiple plates used to connect the high-voltage shields 102 on all the closing resistor insulating tubes 106.

[0058] In this embodiment of the invention, the connecting plate is connected to the high-voltage shield 102 using screws. Both the first connecting plate 103a and the second connecting plate 103b have two screw holes: the first connecting plate 103a has a first screw hole 103a1 and a second screw hole 103a2; the second connecting plate 103b has a third screw hole 103b1 and a fourth screw hole 103b2. The first screw hole 103a1 and the third screw hole 103b1 are both conical countersunk holes. The second screw hole 103a2 is a countersunk hole with an elongated inner hole and a circular outer hole. The fourth screw hole 103b2 is elongated with its top edge angled outwards to achieve the countersunk effect. This elongated structure allows for positional adjustments within a certain range to facilitate assembly.

[0059] Meanwhile, the first connecting plate 103a includes a circular connecting plate body 103a3 and a connecting plate handle 103a4 connected to the connecting plate body 103a3. The first screw hole 103a1 is located at the end of the connecting plate handle 103a4, and the second screw hole 103a2 is located on the connecting plate handle 103a4 near the edge. The second connecting plate 103b is elongated, and the third screw hole 103b1 and the fourth screw hole 103b2 are located at both ends of the second connecting plate 103b, respectively.

[0060] like Figure 7 As shown in the embodiment of the present invention, the high-voltage shield 102 is U-shaped to facilitate fastening to the ports of the closing resistor insulating tube 106 and the fixed insulating tube 109.

[0061] Meanwhile, the high-voltage shield 102 has two corresponding threaded holes. It should be noted that, since the high-voltage shield 102, which is fastened to the fixed insulating tube 109, is only connected to one end of the first connecting plate 103a, the high-voltage shield 102 on the fixed insulating tube 109 has only one threaded hole (e.g., Figure 7 ).

[0062] During assembly, the first screw hole 103a1 on the first connecting plate 103a is aligned with the screw hole of the high-voltage shield 102 on the fixed insulating tube (this high-voltage shield has only one screw hole, as explained above) and a bolt is screwed in. The second screw hole 103a2 on the first connecting plate 103a is aligned with one of the screw holes of the high-voltage shield 102 on one of the closing resistor insulating tubes 103 and a bolt is screwed in. At this time, the circular connecting plate body 103a3 of the first connecting plate 103a covers the upper side of the high-voltage shield 102. The third screw hole 103b1 and the fourth screw hole 103b2 on the second connecting plate 103b are aligned with one of the screw holes of the high-voltage shields on the two adjacent closing resistor insulating tubes 106 and bolts are screwed in. After all the high-voltage shields on the closing resistor insulating tubes 106 are connected by multiple second connecting plates 103b, all the high-voltage shields are connected as one unit.

[0063] like Figure 8 and 9 As shown, for ease of assembly, in this embodiment of the invention, the insulation test fixture for the closing resistor insulation tube also includes an assembly cart 300. The assembly cart 300 is located outside the cylindrical gas tank 100, and the test cart 200 is placed on the assembly cart 300. When no test is being conducted, both are located outside the cylindrical gas tank 100.

[0064] The assembly vehicle 300 is equipped with a ground guide rail 301 that matches the inner guide rail (not shown in the figure) of the cylindrical gas tank 100. When it is necessary to move the structure pre-installed with components such as the closing resistor insulation tube 106 on the test vehicle 200 into the cylindrical gas tank 100 for testing, the assembly vehicle 300 is moved to the cylindrical gas tank 100, so that the ground guide rail 301 on the assembly vehicle 300 aligns with the inner guide rail of the cylindrical gas tank, thereby pushing the test vehicle 200 from the assembly vehicle 300 into the cylindrical gas tank 100.

[0065] In this embodiment of the invention, the assembly vehicle 300 mainly provides a platform for the test vehicle 200 to pre-assemble the closing resistance insulation tube 106 outside the cylindrical gas tank 100. On the assembly vehicle 300, the closing resistance insulation tube 106 is horizontally inserted into the slot 107 of the back plate 101, and then the high-voltage shield 102 is fastened, the connecting plates (including the first connecting plate 103a and the second connecting plate 103b) are installed, and the high-voltage shield 102 is electrically connected to the high-voltage conductor 105, forming a relatively complete test assembly. After the pre-assembly is completed, by moving the assembly vehicle 300 and connecting it to the guide rail, the test vehicle 200 can slide along the ground guide rail 301 of the assembly vehicle 300 and the inner guide rail of the cylindrical gas tank 100 with the help of the pulley 201, smoothly pushing the pre-assembled closing resistance insulation tube test assembly to the test position inside the gas tank 100, realizing the transition from external assembly to internal testing, and completing the entire test preparation work.

[0066] During testing, the high-voltage conductor 105 must be electrically connected to the high-voltage shields 102 on all the insulating tubes of the closing resistors under test. With the fixed insulating tubes 109 in place, the high-voltage conductor 105 can achieve electrical connection with the high-voltage shields 102 on all the insulating tubes 106 of the closing resistors by contacting the connecting plate body 103a3 of the first connecting plate 103a (the specific method of connection has been explained above). Thus, when a test voltage is applied to the high-voltage conductor 105, the high-voltage shields 102 of the closing resistor insulating tubes 106 are all at the high-voltage end, while the other end fixed to the back plate 101 is at the low-voltage end, thereby creating the voltage environment for the fixture test.

[0067] like Figure 10 and Figure 11As shown in the embodiment of the present invention, the front end of the high-voltage conductor 105 is provided with a spring contact 114. The spring contact 114 has a spherical structure and integrates a spring assembly inside. Through the extension and contraction characteristics of the spring, the high-voltage conductor 105 can reliably contact the connecting plate body 103a3 of the first connecting plate 103a.

[0068] Specifically, during contact, the spring force compensates for assembly errors or positional deviations, ensuring a stable electrical connection between the high-voltage conductor 105 and the high-voltage shield 102, thus guaranteeing the effective transmission of the test voltage. Furthermore, during the connection process, the spring's elasticity buffers the impact force during contact, preventing mechanical damage to the tooling from hard contact, thereby improving the safety of the test operation and extending the equipment's lifespan.

[0069] It should be noted that, in the absence of a support mechanism (conductor 108 and fixed insulating tube 109), one of the closing resistance insulating tubes 106 to be tested can be selected and inserted into a suitable slot 107 on the back plate 101 (this closing resistance insulating tube is used as the fixed insulating tube mentioned above). After assembly, the test vehicle 200 is pushed into the cylindrical gas tank 100, so that the high-voltage conductor 105 is connected to the high-voltage shield 102 on this insulating tube through the spring contact, thereby electrically connecting it to the high-voltage shield 102 on all the closing resistance insulating tubes 106. Obviously, compared with the tooling structure with a support mechanism, this tooling structure is not stable enough.

[0070] Figure 12 A flowchart illustrating the insulation test method for the closing resistor insulating tube in one embodiment of this application is shown. Figure 12 As shown, the method includes the following steps:

[0071] Step S1: Connect conductor 108 to back plate 101 with bolts. Insert fixed insulating tube 109 and the closing resistance insulation tube 106 to be tested horizontally into slot 107 of back plate 101. Fasten high voltage shield 102 at the free end of fixed insulating tube 109 and each closing resistance insulation tube 106. Connect multiple high voltage shields 102 into one unit through connecting plate.

[0072] The specific steps include:

[0073] Step S1.1: Connect conductor 108 to back plate 101 with bolts.

[0074] The specific method of fixing the conductor 108 to the back plate 101 with bolts has been described in detail above.

[0075] Step S1.2: Horizontally insert the fixed insulating tube 109 and the insulating tube 106 of the closing resistor to be tested into the slot 107 of the back plate 101.

[0076] Among them, the insulating tubes 106 of the closing resistance to be tested are arranged around the fixed insulating tube 109. The tail of each insulating tube 106 of the closing resistance to be tested and the fixed insulating tube 109 are horizontally inserted into the corresponding slots 107 on the back plate 101, thereby fixing them on the back plate and keeping all the insulating tubes in a horizontal state.

[0077] In this embodiment of the invention, the closing resistor insulation tube 106 consists of five long tubes, each 1025mm in length.

[0078] Step S1.3: Fasten the high voltage shield 102 at the free end of the fixed insulating tube 109 and each closing resistor insulating tube 106.

[0079] The high-voltage shield 102 is a conductive structure, and each high-voltage shield 102 is correspondingly fastened to the free end of the fixed insulating tube 109 or the insulating tube 106 of the closing resistor to be tested.

[0080] Step S1.4: Connect multiple high-voltage shields 102 into one unit using a connecting plate.

[0081] The connecting plate is a conductive structure. The connecting plate connects the fixed insulating tube 109 and the high voltage shield 102 on all the insulating tubes 106 of the closing resistors to be tested, thereby forming a unified high voltage end conductive path.

[0082] In this embodiment of the invention, the connecting plate includes a first connecting plate 103a and a second connecting plate 103b. The specific process of connecting the high-voltage shield 102 into one unit through the connecting plate has been described in detail above.

[0083] Step S2: Hoist the assembled structure from step S1 onto the test vehicle 200, move the assembly vehicle 300 to the gas tank, align the ground guide rail 301 of the assembly vehicle 300 with the inner guide rail of the gas tank 100, push the test vehicle 200 into the appropriate position inside the gas tank 100, and align the high-voltage conductor 105 with the connecting plate on the fixed insulating tube 109 inside the gas tank 100.

[0084] Among them, the connecting plate is the first connecting plate 103a, which is fixed to the high voltage shield 102 at the free end of the fixed insulating tube 109 by screws. The specific connection process has been described in detail above.

[0085] The specific protection steps include:

[0086] Step S2.1: Hoist the assembled structure from step S1 onto the test vehicle 200.

[0087] The assembled structure from step S1 is transferred to the test vehicle 200 using a hoisting device and placed stably on the test vehicle 200. This ensures that the overall structure is stable on the test vehicle 200 and that the connection between the structure and the test vehicle 200 is secure, preventing shaking or displacement during subsequent movement.

[0088] The test vehicle 200 is equipped with pulleys 201 at the bottom.

[0089] Step S2.2: Move the assembly vehicle 300 to the gas tank 100 so that the ground guide rail 301 of the assembly vehicle 300 is connected to the inner guide rail of the gas tank 100.

[0090] Step S2.3: Push the test vehicle 200 into the gas tank 100.

[0091] After the ground guide rail 301 of the assembly vehicle 300 is connected with the inner guide rail of the gas tank 100, the test vehicle 200 is pushed. The pulley 201 at the bottom of the test vehicle 200 slides along the ground guide rail 301 of the assembly vehicle 300, and then enters the inner guide rail of the cylindrical gas tank 100, and continues to move along the inner guide rail until the test vehicle 200 reaches the designated test position inside the gas tank 100, ensuring that the overall structure is in a suitable test state inside the gas tank 100.

[0092] Step S2.4: Connect the high-voltage conductor 105 to the connecting plate on the fixed insulating tube 109 inside the gas tank.

[0093] After the test vehicle 200 is in place, the high-voltage conductor 105 is connected to the first connecting plate 103a fixed on the high-voltage shield 102 at the free end of the fixed insulating tube 109 through the spring contact 114 at the front end. The spring force compensates for assembly errors or positional deviations, ensuring that a stable electrical connection path is formed between the high-voltage conductor 105 and the first connecting plate 103a, and ensuring that the subsequent test voltage can be effectively transmitted.

[0094] At the same time, the elasticity of the spring can buffer the impact force during contact, avoiding mechanical damage to the conductor or tooling caused by hard contact.

[0095] Step S3: Close the canister door 115 of the gas canister 100, evacuate the gas canister 100, and then fill it with insulating gas to the pressure required for the test.

[0096] The specific steps include:

[0097] Step S3.1: Close the tank door 115.

[0098] Confirm that the test vehicle 200 has been pushed to the designated test position inside the gas tank 100. After the high-voltage terminal conductor 105 is reliably docked with the first connecting plate 103a on the fixed insulating pipe 109 inside the gas tank 100 through the spring contact, close the tank door 115 of the gas tank 100 to ensure that the tank door is sealed in place, forming a closed test space to prevent leakage during subsequent vacuum pumping and gas filling processes.

[0099] Step S3.2: Vacuum pumping.

[0100] Start the vacuum equipment supporting the gas tank 100 to conduct vacuum pumping on the inside of the gas tank 100. The purpose is to remove the air and impurity gases inside the tank 100 to avoid interference of these gases on the insulation test. The degree of vacuum pumping needs to meet the test requirements.

[0101] Step S3.3: Fill with insulating gas:

[0102] After the vacuum pumping is completed, turn off the vacuum equipment and start the gas supply device of the insulating gas to fill the insulating gas into the gas tank 100. In the embodiment of the present invention, the insulating gas is SF6 gas. At the same time, the pressure inside the tank needs to be monitored during the gas filling process until the required pressure value for the test is reached. After the gas filling is completed, the pressure inside the tank needs to be kept stable to ensure that the test is carried out in the set insulating gas environment.

[0103] Step S4: Apply a power frequency voltage through the high-voltage terminal conductor 105, then reduce it to the partial discharge test voltage, and start the partial discharge tester to conduct partial discharge testing.

[0104] The specific steps include:

[0105] Step S4.1: Apply a power frequency voltage through the high-voltage terminal conductor 105.

[0106] After starting the power frequency test equipment, the test voltage is sequentially conducted through the high-voltage terminal conductor 105 to the connecting plate and each high-voltage shield 102, and finally applied to the horizontally placed closing resistor insulating pipe 106 to be tested. The applied power frequency voltage needs to meet the standard requirements of the insulation test. This process is used to verify the insulation performance of the insulating pipe under the rated or withstand voltage to ensure that it does not breakdown or flashover.

[0107] Step S4.2: Adjust the voltage to the partial discharge test voltage.

[0108] After the power frequency voltage is applied and maintained for a specified time to reach a stable state, reduce the voltage to the voltage value corresponding to the partial discharge test to detect possible partial discharge phenomena inside the closing resistor insulating pipe 106 under more accurate voltage conditions.

[0109] Step S4.3: Conduct partial discharge test operation.

[0110] After the partial discharge tester is turned on, the instrument monitors the partial discharge signal of the insulating tube under the partial discharge test voltage through a preset detection circuit. During the test, key parameters such as discharge quantity and discharge count need to be recorded to determine the insulation integrity of the closing resistor insulating tube 106. If the partial discharge quantity is within the standard allowable range, it indicates that the insulating tube meets the requirements; if it exceeds the standard, it is judged as unqualified.

[0111] The advantages of this invention are as follows: First, by placing long insulating tubes horizontally and using structures such as a large backplate and connecting plate, the limitation of vertical testing by the height of the test tank is overcome, solving the space limitation problem and enabling reliable insulation testing of long tubes. Second, the combination of high-voltage shielding and connecting plate ensures uniform electric field distribution during the test, avoiding test errors caused by local electric field concentration. The SF6 gas environment simulates the actual operating state of the equipment, making the test results closer to reality. Third, the technical solution of this invention can test multiple insulating tubes simultaneously, significantly improving the testing efficiency of resistance insulation. Finally, the guide rail docking design between the assembly vehicle and the test vehicle facilitates the transportation and positioning of the insulating tubes, making operation convenient, and the spring contact setting ensures the reliability of the high-voltage connection. In summary, the insulation testing work and method for closing resistance insulating tubes provided by this invention effectively solves the space limitation problem in testing resistance insulating tubes and has significant production application value.

[0112] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. An insulation testing fixture for a closing resistor insulating tube, used for insulation testing of a closing resistor insulating tube, characterized in that, The insulation test fixture for the closing resistor insulating tube includes: Gas tank (100), the closing resistor insulation tube (106) is placed horizontally inside the gas tank (100) for insulation testing; Test vehicle (200), which is movably disposed inside the gas tank (100), and the closing resistor insulation tube (106) is placed horizontally on the test vehicle (200); Back plate (101), the back plate (101) is fixed on the test vehicle (200), the closing resistor insulation tube (106) is fixed on the back plate (101), the back plate (101) serves as the tail support of the closing resistor insulation tube (106) and is the low voltage end; High voltage shield (102), wherein there are multiple high voltage shields (102) and each high voltage shield (102) is correspondingly fastened to the free end of a closing resistor insulating tube (106); A connecting plate, wherein there are multiple connecting plates, for connecting multiple high-voltage shields (102) into one unit; A high-voltage end conductor (105), which is electrically connected to all of the high-voltage shields (102), is used to apply a test voltage; The gas tank (100) is cylindrical and has an inner guide rail extending along its length at the bottom; during testing, the gas tank (100) is filled with SF6 insulating gas. The insulation test fixture for the closing resistor insulation tube also includes an assembly vehicle (300), which is located outside the gas tank (100). The assembly vehicle (300) is provided with a ground guide rail (301) that is connected to the inner guide rail of the gas tank (100). The test vehicle (200) is located on the assembly vehicle (300). The bottom of the test vehicle (200) is provided with a pulley (201), which can slide along the inner guide rail of the gas tank (100) and the ground guide rail (301) of the assembly vehicle (300).

2. The insulation test fixture for the closing resistor insulating tube according to claim 1, characterized in that, The closing resistor insulation tube insulation test fixture also includes a support mechanism, which includes a conductor (108) fixed horizontally on the back plate (101) and a fixed insulation tube (109) sleeved on the conductor (108), and a high voltage shield (102) is fastened to the free end of the fixed insulation tube (109).

3. The insulation test fixture for the closing resistor insulating tube according to claim 2, characterized in that, One end of the conductor (108) is connected to the back plate (101) by bolts; the back plate (101) is provided with a plurality of slots (107), and the closing resistor insulating tube (106) and the fixing insulating tube (109) are fixed on the back plate (101) by inserting into the slots (107).

4. The insulation test fixture for the closing resistor insulating tube according to claim 2, characterized in that, The connecting plate includes a first conductive connecting plate (103a) and a second connecting plate (103b). The first connecting plate (103a) is used to connect the high voltage shield (102) on the fixed insulating tube (109) to the high voltage shield (102) on one of the closing resistor insulating tubes (106). The second connecting plate (103b) is used to connect the high voltage shields (102) on all the closing resistor insulating tubes (106).

5. The insulation test fixture for the closing resistor insulating tube according to claim 4, characterized in that, The first connecting plate (103a) is provided with a first screw hole (103a1) and a second screw hole (103a2), and the second connecting plate (103b) is provided with a third screw hole (103b1) and a fourth screw hole (103b2). The high-voltage shield (102) fastened to the fixed insulating tube (109) has a threaded hole, and the high-voltage shield (102) fastened to the closing resistor insulating tube (106) has a threaded hole; During assembly: the first screw hole (103a1) is aligned with the screw hole of the high voltage shield (102) on the fixed insulating tube (109) and a bolt is screwed in; the second screw hole (103a2) is aligned with one of the screw holes of the high voltage shield (102) on one of the closing resistor insulating tubes (106) and a bolt is screwed in; the third screw hole (103b1) and the fourth screw hole (103b2) are aligned with one of the screw holes of the high voltage shield (102) on the two adjacent closing resistor insulating tubes (106) and a bolt is screwed in respectively.

6. The insulation test fixture for the closing resistor insulating tube according to claim 5, characterized in that, The second screw hole (103a2) includes a recessed inner hole, and both the inner hole and the fourth screw hole (103b2) are elongated to accommodate positional adjustments within a certain range.

7. The insulation test fixture for the closing resistor insulating tube according to any one of claims 2 to 6, characterized in that, The high-voltage conductor (105) makes reliable contact with the connecting plate at the free end of the fixed insulating tube (109) through the spring contact (114) at the front end. Both the connecting plate and the high-voltage shield (102) are conductive structures. After multiple high-voltage shields (102) are connected through the connecting plate, they are electrically connected to the high-voltage conductor (105).

8. A method for testing the insulation of a closing resistor insulating tube, applied to the insulation testing fixture for the closing resistor insulating tube as described in claim 1, characterized in that, The insulation test method for the closing resistor insulating tube includes the following steps: Step S1: Connect the conductor (108) to the back plate (101) with bolts, and insert the fixed insulating tube (109) and the closing resistance insulating tube (106) to be tested horizontally into the slot (107) of the back plate (101). Fasten the high voltage shield (102) at the free end of the fixed insulating tube (109) and each closing resistance insulating tube (106), and connect multiple high voltage shields (102) into one unit through the connecting plate. Step S2: Hoist the assembled structure from step S1 onto the test vehicle, move the assembly vehicle (300) to the gas tank, and align the ground guide rail (301) of the assembly vehicle (300) with the inner guide rail of the gas tank (100). Push the test vehicle (200) into the appropriate position inside the gas tank (100) so that the high-voltage conductor (105) aligns with the connecting plate on the closing resistor insulation tube (106) inside the gas tank. Step S3: Close the canister door (115) of the gas cylinder (100), evacuate the gas cylinder (100) and then fill it with insulating gas to the pressure required for the test; Step S4: Apply power frequency voltage through the high-voltage end conductor (105), then reduce it to the partial discharge test voltage, and turn on the partial discharge tester to perform partial discharge test.

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