Plug-in power cable insulation test tool

Abstract

The utility model provides a plug-in power cable insulation test tool, which relates to the technical field of power equipment testing, and comprises an insulation sleeve and a plug-in cable terminal to be tested, the lower part of the insulation sleeve is open, and the upper part of the insulation sleeve is closed and is provided with an inflation and deflation interface. The plug-in cable terminal head is inserted into the insulating sleeve from the lower opening of the insulating sleeve and is in sealed connection with the insulating sleeve through the flange connecting piece, and SF6 gas is filled into the insulating sleeve through the inflation and deflation interface to replace air, so that the internal environment of the sleeve is insulated. The voltage withstanding test is carried out on the plug-in cable terminal head through the voltage withstanding test device, so that the cable terminal head can be prevented from being directly inserted into a gas-insulated switchgear or a GIS tank body to carry out the voltage withstanding test, and the safety risk and the possibility of equipment damage are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of power equipment testing, in particular to an insertion type power cable insulation test tool. Background Art

[0002] Plug-in cable terminals usually refer to cable terminals inserted into equipment such as GIS (gas-insulated metal-enclosed switchgear) or gas cabinets, which are used to connect the conductive connection between the cable and the equipment. During the voltage withstand test, the plug-in cable terminals need to withstand the test of the high-voltage environment, so a voltage withstand test is required to ensure its insulation performance and safety. The excellent insulation performance of SF6 gas has enabled the rapid popularization of the application of GIS and gas cabinets, and the application growth rate of the matching plug-in power cables has accelerated. The insulation strength of the cable terminal of the plug-in power cable is designed according to the SF6 environment after being inserted into the GIS tank or gas cabinet. Since the insulation performance of air is lower than that of SF6, its voltage withstand test cannot be completed in the air. Since the insulation voltage withstand test is destructive, it is impossible to perform the voltage withstand test directly in the GIS gas chamber under the circumstances, so matching test tooling is required to solve the voltage withstand test requirements of the plug-in cable terminal.

[0003] Therefore, it is necessary to introduce a reliable plug-in cable terminal head pressure test tool, which can perform pressure test on the cable head without directly inserting it into the inflatable cabinet or GIS tank, so as to better ensure the safety and integrity of the equipment; in addition, for the pressure test of plug-in cable terminal heads, traditional test tools may not meet the needs of cable terminal heads of different types and specifications, and lack sufficient flexibility and compatibility. Utility Model Content

[0004] Based on the above problems, the utility model proposes a plug-in cable insulation test tool, which is designed to simulate the SF6 gas environment to ensure the safety and reliability of the withstand voltage test process. At the same time, the tool is flexible and can be applied to plug-in cable terminals of various voltage levels and sizes. The specific technical solution is as follows:

[0005] A plug-in power cable insulation test tool comprises an insulating sleeve and a plug-in cable terminal head to be tested, wherein the insulating sleeve is open at the bottom, the insulating sleeve is closed at the top and is provided with a charging and discharging interface. When in use, the plug-in cable terminal head is inserted into the insulating sleeve through the opening at the bottom of the insulating sleeve, the connection is sealed by a flange connector, and SF6 gas is filled into the insulating sleeve through the charging and discharging interface to replace the air, so as to achieve insulation of the internal environment of the sleeve.

[0006] By adopting the above technical solution, the tooling forms a sealed cavity around the plug-in cable terminal through the structure of the insulating sleeve and the flange connector. The purpose of filling SF6 gas into the sealed cavity is to simulate an insulating environment similar to that in GIS, thereby reducing the risk of arcing during the voltage withstand test of the plug-in cable terminal to ensure the accuracy and reliability of the test process.

[0007] Furthermore, the flange connector includes a mounting flange of the plug-in cable terminal to be tested and a mating flange matching the mounting flange, the opening end of the insulating sleeve is integrally formed with a sealing seat, and the mating flange is sleeved over the sealing seat of the insulating sleeve.

[0008] By adopting the above technical solution, the tooling can be applied to different types and specifications of plug-in cable terminals, which improves the adaptability and versatility of the tooling. The plug-in cable terminal comes with a mounting flange. According to the voltage level and flange size of the plug-in cable terminal, the tooling uses a matching butt flange to achieve flange connection, which can ensure a tight connection with it and maintain efficient sealing performance during the pressure test, thereby improving the reliability and accuracy of the test.

[0009] Furthermore, the gas charging and discharging interface is provided with an air inlet valve and an air exhaust valve, and both the air inlet valve and the air exhaust valve are one-way vent valves.

[0010] The above technical solution can realize two-way ventilation of gas at the gas charging and discharging interface, which can not only fill SF6 gas into the insulating sleeve, but also discharge the gas inside the insulating sleeve. The gas charging and discharging process is controlled through the inlet valve and the exhaust valve respectively, ensuring that the gas inside the insulating sleeve is fully replaced and the SF6 purity meets the standard.

[0011] Furthermore, the gas charging and discharging interface is provided with a pressure gauge.

[0012] By adopting the above technical solution, the internal air pressure of the insulating sleeve can be visually observed during the replacement process of SF6 gas inside the insulating sleeve, so as to ensure that the internal air pressure of the insulating sleeve reaches a slightly positive pressure before the withstand voltage insulation test.

[0013] Furthermore, the depth of the insulating sleeve is not less than twice the length of the portion of the plug-in cable terminal head inserted into the sleeve.

[0014] The above technical solution is adopted to ensure that the plug-in cable terminal head is completely wrapped by the insulating sleeve and is in an insulating environment. In order to simulate the insulating environment of SF6 gas, the depth of the insulating sleeve should at least be able to accommodate the size of the plug-in cable terminal head, and the characteristics and working requirements of SF6 gas should also be taken into account to ensure sufficient insulation effect. The size of the plug-in cable terminal head and additional safety margins need to be considered to ensure that the cable head can be fully inserted and effectively insulated from the SF6 gas environment.

[0015] Furthermore, the insulating sleeve is made of any one of polypropylene and polyethylene.

[0016] With the above technical solution, the material of the insulating sleeve is light, considering the portability and operability of the test tooling. The selection of polypropylene and polyethylene materials can reduce the weight of the tooling, facilitate carrying and moving, and reduce the labor intensity during use. At the same time, this tooling is subjected to a pressure test under normal pressure, so there is no need to consider the pressure resistance of the material.

[0017] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0018] The use of the plug-in power cable insulation test tool provided by the utility model can avoid directly inserting the cable terminal head into the inflatable cabinet or GIS tank for pressure resistance testing, thereby reducing safety risks and the possibility of equipment damage.

[0019] The utility model can adapt to cable terminal heads of various sizes and specifications through replaceable butt flanges, thereby improving the compatibility and application range of equipment.

[0020] The utility model simulates the insulating environment in the gas cabinet or GIS tank by introducing SF6 gas, thereby ensuring the reliability of the cable terminal head in the pressure test and protecting the internal equipment of the gas cabinet or GIS tank, avoiding damage to the equipment due to the destructiveness of the pressure test.

[0021] By adopting the plug-in power cable insulation test tool provided by the utility model, the withstand voltage test operation is made simpler, and the operator only needs to insert the cable terminal head into the tool and inject SF6 gas to complete the environmental simulation without the need for additional complicated operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is an isometric view in an embodiment of the utility model;

[0023] Figure 2 It is an isometric view of the insulating sleeve and the plug-in cable terminal head in the embodiment of the utility model;

[0024] Figure 3 yes Figure 2A partial enlarged view of the middle A;

[0025] Figure 4 It is a right side view of the insulating sleeve in the embodiment of the utility model;

[0026] Figure 5 It is a right side view in the embodiment of the utility model;

[0027] Figure 6 yes Figure 5 A cross-sectional view along the cutting line BB;

[0028] The reference numerals are as follows: insulating sleeve 100 ; sealing seat 101 ; docking flange 102 ; charging and discharging interface 103 ; air inlet valve 104 ; air outlet valve 105 ; pressure gauge 106 ; plug-in cable terminal 200 ; and mounting flange 201 . DETAILED DESCRIPTION

[0029] Hereinafter, the technology in the embodiments of the present invention will be described clearly and completely in conjunction with the drawings in the embodiments of the present invention; it is obvious that the described embodiments are only part of the embodiments of the present invention, not all of them; based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work should fall within the scope of protection of the present invention. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0030] Reference Figures 1-2 The embodiment of the utility model provides a plug-in power cable insulation test tool, including an insulating sleeve 100 and a plug-in cable terminal head 200 to be tested. The lower end of the insulating sleeve 100 is open, and a sealing seat 101 is provided at the open end for inserting the plug-in cable terminal head 200 into the insulating sleeve 100. A docking flange 102 is provided on the sealing seat 101, and the docking flange 102 matches the mounting flange 201 of the plug-in cable terminal head 200 to be tested. When the plug-in cable terminal head 200 is inserted into the insulating sleeve 100, the sealing seat 101 matches the mounting flange 201 of the terminal head, and the docking flange 102 is fastened to the mounting flange 201 by a bolt connection pair to form a sealed connection.

[0031] Reference Figure 3 The upper end of the insulating sleeve 100 is closed and provided with a charging and discharging interface 103. A two-way vent valve 104 is used at the charging and discharging interface 103 to achieve two-way ventilation of the gas at the charging and discharging interface 103, so that SF6 gas can be filled into the insulating sleeve 100 and the gas inside the insulating sleeve 100 can be discharged. The two-way vent valve 104 controls the gas charging and discharging process to ensure that the gas inside the insulating sleeve 100 is fully replaced and the SF6 purity meets the standard.

[0032] Reference Figure 3 The upper end of the insulating sleeve 100 is closed and provided with a charging and discharging interface 103. A three-way connection is used at the charging and discharging interface 103 to respectively connect the inlet valve 104, the exhaust valve 105, and the pressure gauge 106. The inlet valve 104 and the exhaust valve 105 are one-way vent valves, which can realize two-way ventilation of the gas at the charging and discharging interface, and can both fill the SF6 gas into the insulating sleeve and discharge the gas inside the insulating sleeve; and the pressure gauge 106 can visually observe the internal air pressure of the insulating sleeve during the replacement process of the SF6 gas inside the insulating sleeve, so as to ensure that the internal air pressure of the insulating sleeve reaches a slightly positive pressure before the withstand voltage insulation test. The gas charging and discharging process is controlled by the inlet valve 104 and the exhaust valve 105 respectively, and the internal pressure is observed in real time according to the reading of the pressure gauge 106, so as to ensure that the gas inside the insulating sleeve is fully replaced and the purity and air pressure of SF6 meet the standards.

[0033] Reference Figure 6 Preferably, in this embodiment, the depth of the insulating sleeve 100 is twice the length of the portion of the plug-in cable terminal head 200 inserted into the sleeve.

[0034] Preferably, the insulating sleeve 100 in this embodiment is made of polypropylene.

[0035] The working principle of the pressure test tool provided in this embodiment is as follows:

[0036] 1. Place the plug-in cable terminal head 200 to be tested into the insulating sleeve 100, and butt the sealing seat 101 of the insulating sleeve 100 with the flange interface of the mounting flange 201 of the plug-in cable terminal head 200;

[0037] 2. Select a docking flange 202 that matches the mounting flange 201, sleeve it on the insulating sleeve 100, and use a bolt connection pair to tighten and seal the flange;

[0038] 3. Inject SF6 gas into the insulating sleeve 100 from the air inlet valve 104, and replace the air inside the insulating sleeve 100 with SF6 gas by a pressurized replacement method;

[0039] 4. After gas replacement, the purity of the injected SF6 gas is detected at the exhaust valve 105. When the purity is greater than 97%, the intake valve 104 and the exhaust valve 105 are closed. At this time, the SF6 gas in the insulating sleeve 100 is in a slightly positive pressure state;

[0040] 5. At this point, the insulation requirements of the plug-in cable terminal head 100 at this end have been met, and the voltage withstand test can be carried out normally. The voltage withstand test is carried out at the other end of the cable.

[0041] It should be noted that before and after the test, the SF6 gas exhausted through the exhaust valve 105 can be recovered by connecting the exhaust valve 105 to the SF6 gas recovery device.

Claims

1. An insertable power cable insulation test tool, characterized in that: It includes an insulating sleeve and a plug-in cable terminal to be tested. The insulating sleeve has an opening at the bottom, and is closed at the top and provided with a charging and discharging interface. When in use, the plug-in cable terminal is inserted into the insulating sleeve through the opening at the bottom of the insulating sleeve, and is sealed and connected through a flange connector. SF6 gas is filled into the insulating sleeve through the charging and discharging interface to replace the air, so as to achieve insulation of the internal environment of the sleeve.

2. The plug-in type power cable insulation test tool according to claim 1, characterized in that: The flange connector includes a mounting flange of a plug-in cable terminal to be tested and a mating flange matching the mounting flange. A sealing seat is integrally formed at the opening end of the insulating sleeve, and the mating flange is sleeved over the sealing seat of the insulating sleeve.

3. The plug-in type power cable insulation test tool according to claim 1, characterized in that: The gas charging and discharging interface is provided with a two-way ventilation valve.

4. The plug-in type power cable insulation test tool according to claim 3, characterized in that: The gas charging and discharging interface is provided with a pressure gauge.

5. The plug-in type power cable insulation test tool according to claim 1, characterized in that: The depth of the insulating sleeve shall not be less than twice the length of the part of the plug-in cable terminal inserted into the sleeve.

6. The plug-in type power cable insulation test tool according to claim 1, characterized in that: The insulating sleeve is made of any one of polypropylene and polyethylene.

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