Insulation test shielding voltage-withstanding device for composite apparatus switch

Abstract

The invention provides an insulation test shielding voltage-withstanding device for a combined electric appliance switch, and relates to the field of high-voltage switch power transmission and transformation equipment, and the combined electric appliance switch is typically provided with a circuit breaker and at least two isolation switches connected with the circuit breaker at intervals; the output end of the cable tank connected with each isolating switch is detachably connected with a shielding tank body; a partition plate is arranged in the shielding tank body, an insulating sleeve is arranged on the partition plate, and one end of a test area of the insulating sleeve is connected to the output end of the isolating switch; a tail end shielding piece is arranged at one end of the observation area of the insulating sleeve; an access cover plate is arranged at one end of the observation area of the shielding tank body; an observation window is mounted on the access cover plate; according to the invention, a manner of uniformly packaging and sealing the tail end shielding device with the inflation interface for the incoming and outgoing cable tank is adopted, so that the test floor area is reduced, and the number and the range of exposed high-voltage electrified bodies are reduced. The test operation space is more compact and reasonable, and the safety is fully improved.

Description

Technical Field

[0001] This invention relates to the field of high-voltage switchgear and power transmission equipment, specifically to an insulation test shielding withstand voltage device for combined electrical switchgear. Background Technology

[0002] The use of compact, all-cable switchgear for 40.5kV to 110kV applications has become the mainstream trend, with offshore wind turbine tower switchgear and prefabricated hull switchgear being the main product types. Due to the constraints of offshore power transportation and limited space, offshore wind turbine tower and prefabricated hull switchgear are generally designed with all-cable entry and exit bays, with voltage levels currently ranging from 40.5kV to 110kV. Correspondingly, insulation withstand voltage tests require cross-operation with cable terminal manufacturers.

[0003] Current collector switches need to undergo a withstand voltage test before leaving the factory, such as Figure 1 As shown, during testing, the current collector switch 101 needs to be connected to the inlet terminal 102 and the outlet terminal 103 of the withstand voltage cable. Figure 1 It is known that extending the insulation distance by using extended cables, with open cable terminals typically configured with approximately 4m of cable, results in high weight and length space requirements. Insulation testing requires a large space, and the exposed test ends lack adequate protection, posing a potential risk of electric shock. Insufficient optimization of the electric field distribution in key components such as insulating sleeves can easily lead to localized electric field concentration and insulation breakdown. Furthermore, gaseous impurities and moisture in the test environment can affect the performance of insulating gases, and there is a lack of effective measures to maintain a good insulation environment. The fixed voltage input connection method makes it difficult to adapt to different sites and phase sequence requirements, limiting its application scenarios. Moreover, unreliable electrical connections are prone to problems such as poor contact, affecting the test process. Summary of the Invention

[0004] This invention provides an insulation test shielding withstand voltage device for combined electrical switchgear, which achieves efficient insulation testing of combined electrical switchgear through the coordinated operation of its various parts.

[0005] The device includes: a combination electrical switch, the combination electrical switch being equipped with a circuit breaker and at least two disconnecting switches respectively connected to the circuit breaker; Each disconnector switch is connected to a shielded canister at the output end of its cable canister. The shielded tank is equipped with a partition. One side of the partition is the observation area and the test area. An insulating sleeve is installed on the partition. The test area end of the insulating sleeve is connected to the output end of the disconnecting switch. An end shield is provided at one end of the observation area of ​​the insulating sleeve; The observation area of ​​the shielded tank is equipped with a maintenance cover, and an observation window is installed on the maintenance cover. The voltage input end of the combined electric appliance switch is detachably connected with a voltage input assembly, and connected to a power supply through the voltage input assembly.

[0006] Further, a sealing ring is installed between the cable tank and the inner wall of the shielding tank body. One end of the test area of the insulating sleeve is connected to the output end of the disconnecting switch through a special-shaped conduit.

[0007] Further, a gas charging and discharging pipeline is installed on the shielding tank body, and a gas charging and discharging valve and a pressure gauge are installed on the gas charging and discharging pipeline.

[0008] Further, an observation hole is formed at the position of the observation window of the maintenance cover plate, a groove is arranged in the observation hole, a glass sealing ring, tempered glass and a crimping flange are crimped on the groove, and the crimping flange is fixed to the observation hole through bolts.

[0009] Further, an adsorbent is installed on the maintenance cover plate, and the adsorbent is arranged on the inner side of the tank of the maintenance cover plate.

[0010] Further, the voltage input assembly is provided with a transition turning mechanism, one end of the transition turning mechanism is connected with a transition plug-in mechanism, and the other end is connected with a bullhead sleeve mechanism; The bullhead sleeve mechanism is provided with a sleeve tank body, and a bullhead conductor base is arranged inside the sleeve tank body; three through holes are formed on the sleeve tank body, and a bullhead conductor is detachably connected with the through holes, and an insulating porcelain bottle is sleeved outside the bullhead conductor; The bottom end of the bullhead conductor is connected with the bullhead conductor base, and the top end of the bullhead conductor is fixedly connected with a terminal block.

[0011] Further, the bullhead conductor base is provided with an insulating support plate, Three phase conductors are installed on the insulating support plate, and the phase conductors adopt special-shaped conduits; The connecting end of the phase conductor and the conductor is provided with a contact seat; The contact seat is provided with a cavity, and the bottom end of the cavity is connected with the phase conductor through bolts; At least two conductive springs are installed at the position close to the port of the contact seat.

[0012] Further, a transition turning conductor is arranged inside the transition turning mechanism; A plug-in conductor is arranged inside the transition plug-in mechanism; The bullhead conductor is connected to the plug-in conductor through the bullhead conductor base and the transition turning conductor in sequence; The plug-in conductor is connected with the voltage input end of the combined electric appliance switch.

[0013] Further, a support transition plate is arranged between the transition turning mechanism and the transition plug-in mechanism. A support insulation plate is arranged between the transition turning mechanism and the bullhead sleeve mechanism; The outer edge of the support insulation plate is provided with a metal flange, and the support insulation plate is provided with an epoxy resin and a conductive metal insert; The support transition plate is provided with a transition turning conductor.

[0014] Further, the cross section of the end shielding member is T-shaped, the vertical section of the end shielding member is provided with threads and is connected to the inside of the insulation sleeve through the threads; and the horizontal section of the end shielding member is a circular arc transition head, which can uniformly distribute the electric field of the end high-voltage conductor.

[0015] As can be seen from the above technical solutions, the present application has the following advantages: The insulation test shielding pressure device for the combined electric switch provided in the present application adopts the mode of uniformly packaging and sealing the inlet and outlet cable tank with the end shielding device with an inflation interface, thereby reducing the test area, reducing the number and range of external leakage high-voltage live parts. After solving, the risk of electric shock of personnel is greatly reduced, the test operation space is more compact and reasonable, and the safety is significantly improved.

[0016] The inner partition plate of the shielding tank separates the observation area and the test area, the sealing ring between the partition plate and the inner wall of the tank ensures the sealing property and prevents the leakage of the insulation gas. The insulation sleeve is connected to the output end of the disconnecting switch to realize the conductive and insulation functions. The end shielding member optimizes the electric field distribution at the end of the insulation sleeve and reduces the partial discharge. The observation window on the maintenance cover plate facilitates the observation of the test condition and is beneficial to the pressure observation. The inflation nozzle is arranged on the shielding tank and is configured with inflation and deflation pipelines, valves and pressure gauges, so that the inflation and deflation of the insulation gas can be controlled, the pressure of the gas in the tank is maintained stable, the pressure is monitored in real time by the pressure gauges, and the test is ensured to be safe and stable. The transition turning mechanism can change the direction of the voltage introduction of the equipment to meet the butt joint requirements of different sites and phases; the transition plug-in mechanism is convenient for connection with the combined electric switch; the insulation porcelain bottle in the bullhead sleeve mechanism ensures the insulation, the conductive spring ensures good electrical contact, the wiring board is convenient for external connection of the circuit, and the whole realizes flexible and stable voltage input.

[0017] The insulation test shielding pressure device realizes efficient insulation test of the combined electric switch through the cooperation of each part. The device is convenient to install and maintain, and ensures the stability, accuracy and safety of the insulation test. At the same time, the flexible voltage input and phase sequence adjustment function enhances the applicability of the device and can meet the requirements of various test scenes. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the present application, the drawings required to be used in the description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creating laborious work.

[0019] Figure 1 schematic diagram of prior art test; Figure 2 schematic diagram of insulation test shield voltage withstand device for combined electrical switch; Figure 3 schematic diagram of shield can body; Figure 4 schematic diagram of end shield; Figure 5 schematic diagram of maintenance cover; Figure 6 schematic diagram of maintenance cover; Figure 7 schematic diagram of voltage input assembly; Figure 8 schematic diagram of voltage input assembly embodiment; Figure 9 schematic diagram of bull head sleeve mechanism; Figure 10 schematic diagram of voltage input assembly assembly; Figure 11 schematic diagram of voltage input assembly assembly; Figure 12 schematic diagram of insulation support plate; Figure 13 schematic diagram of support transition plate; Figure 14 schematic diagram of contact seat; Figure 15 schematic diagram of support insulation plate embodiment.

[0020] Explanation of reference signs: 1 - combined electrical switch, 2 - circuit breaker, 3 - disconnector, 4 - shield can body, 5 - partition, 6 - observation area, 7 - test area, 8 - insulation sleeve, 9 - special-shaped conduit, 10 - end shield, 11 - maintenance cover, 12 - observation window, 13 - observation hole, 14 - glass sealing ring, 15 - tempered glass, 16 - crimping flange, 18 - gas charging pipeline, 19 - gas charging valve, 20 - pressure gauge, 21 - transition turning mechanism, 22 - transition plug-in mechanism, 23 - bull head sleeve mechanism, 24 - support transition plate, 25 - support insulation plate, 26 - transition turning conductor, 27 - plug-in conductor, 28 - bull head conductor, 29 - sleeve can body, 30 - bull head conductor base, 31 - insulation porcelain bottle, 32 - wiring board, 33 - insulation support plate, 34 - phase conductor, 35 - contact seat, 36 - cavity, 37 - conductive spring, 41 - metal flange, 42 - epoxy resin, 43 - metal insert, 110 - thread, 111 - circular arc transition head, 101 - current collection switch, 102 - high-voltage cable incoming end, 103 - high-voltage cable outgoing end. DETAILED DESCRIPTION

[0021] The combination electrical appliance switch insulation test shielding voltage resistance device related to the present application will be described in detail below. For the purpose of illustration but not for the purpose of limitation, specific details such as specific system structures, techniques, and the like are presented in order to provide a thorough understanding of the embodiments of the present application. However, it should be apparent to those skilled in the art that the present application can be implemented in other embodiments without these specific details.

[0022] It should be understood that when used in the specification, the term "comprises / comprising" indicates the presence of the described features, integers, steps, operations, elements, and / or components, but does not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof. The terms "comprise", "contain", "have" and their conjugates mean "including but not limited to", unless otherwise specifically emphasized.

[0023] It should be understood that the "one or more" referred to in the present application means one, two or more than two, and the "multiple" referred to in the present application means two or more than two. In the description of the present application, unless otherwise specified, " / " means or, for example, A / B can mean A or B. "And / or" in this paper is only a description of the relationship between the associated objects, which means that there can be three relationships, such as A and / or B, which means that there are three cases of A alone, A and B together, and B alone.

[0024] In order to clearly describe the technical solutions of the present application, "first", "second" and the like are used to distinguish the same items or similar items with basically the same function and role. Those skilled in the art can understand that "first", "second" and the like do not limit the quantity and execution order, and "first", "second" and the like do not necessarily mean different.

[0025] The phrase "one embodiment" or "some embodiments" and the like appearing in the present application means that the specific features, structures or characteristics described in the embodiment are included in one or more embodiments of the present application. Therefore, the phrases "in one embodiment", "in some embodiments", "in other some embodiments", "in other some embodiments" and the like appearing in the present application do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized.

[0026] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all the other embodiments obtained by those of ordinary skill in the art without creative effort should fall into the scope of the present application.

[0027] Please refer to Figures 2 to 6 Fig. 1 is a structural schematic diagram of an insulation test shielding voltage withstand device for combined electric switch in an embodiment, which comprises: a combined electric switch 1, the combined electric switch 1 is a switch device in which a plurality of primary electric appliances such as circuit breakers 2 and disconnectors 3 are combined together according to certain electrical main wiring requirements. The circuit breaker 2 can connect or disconnect the circuit under normal and fault conditions. It is a vacuum circuit breaker or an SF6 circuit breaker. The contact of the disconnector 3 is exposed in the insulation medium, and the disconnector 3 is operated manually or electrically to realize the connection and disconnection. The output end of each cable tank connected with the disconnector is detachably connected with a shielding tank body 4; the shielding tank body 4 has a partition plate 5 inside to divide an observation area 6 and a test area 7, the shielding tank body 4 has a reinforcing rib structure, and the inner wall is coated with iron red epoxy insulation paint.

[0028] The detachable connection of the embodiment is convenient for installation, maintenance and repair; the partition plate 5 can separate the areas to make the test and observation not interfere with each other; the reinforcing rib increases the strength of the tank body, which can withstand the internal charging of the rated pressure 0.8 MPa of the insulation gas; the coating of the inner wall increases the smoothness of the inner cavity and improves the insulation capacity, and at the same time, it is convenient to check the discharge trace. The shielding tank body 4 is connected with the disconnector 3 to isolate the test area 7 from the outside, and the inside is filled with insulation gas to cooperate with other components to perform the insulation test.

[0029] The partition plate 5 is installed inside the shielding tank body 4, and a sealing ring is installed between the cable tank and the inner wall of the shielding tank body 4 in the embodiment; the partition plate 5 divides the shielding tank body 4 into the observation area 6 and the test area 7, and an insulation sleeve 8 is installed on the partition plate 5; one end of the test area 7 of the insulation sleeve 8 is connected to the output end of the disconnector 3 through a special-shaped conduit 9.

[0030] It should be noted that the partition plate 5 in the embodiment can be installed with three insulation sleeves 8. One end of the test area 7 of the insulation sleeve 8 is connected to the output end of the disconnector 3; one end of the observation area 6 of the insulation sleeve 8 is provided with a terminal shielding member 10; one end of the observation area 6 of the shielding tank body 4 is provided with a maintenance cover plate 11, and an observation window 12 is installed on the maintenance cover plate 11.

[0031] In some specific embodiments, the test area 7 for safe isolation and the observation area 6 for convenient observation are created in the shielding tank body 4, and the introduction of the high-voltage conductor and the electric field control are realized.

[0032] The end shield 10 of the embodiment functions to homogenize the electric field distribution, eliminate the electric field concentration on the side of the observation area 6, prevent local discharge or flashover of non-subject product from occurring at the place, and ensure that the test voltage is applied to the switch body and the connecting part.

[0033] The partition 5 prevents the electric arc, particles or strong airflow generated in the test area 7 from directly impacting the observation window. The end shield 10 ensures smooth transition of the electric field at the end of the insulating sleeve 8. The observation area 6 guarantees the safety and clarity of observation; and the insulating sleeve 8 realizes electrical penetration and isolation.

[0034] The end shield 10 of the embodiment has a T-shaped cross section, the vertical section has a thread 110 for connecting the inside of the insulating sleeve 8, and the horizontal section is a circular arc transition head 111. The circular arc transition head is fixed in the insulating sleeve 8 through threaded connection, optimizes the electric field distribution, reduces the electric field concentration, and prevents insulation breakdown and local discharge. The special shape is used to adjust the electric field strength distribution at the end of the insulating sleeve 8, so that the electric field is more uniform.

[0035] The observation area 6 provides observation of the test process and the state of the insulating sleeve 8, while ensuring the sealing of the tank body. The maintenance cover plate 11 is installed at one end of the observation area 6 of the shielded tank body 4, and is detachably connected for easy maintenance.

[0036] It should be noted that the observation window 12 of the maintenance cover plate 11 is provided with an observation hole 13, a groove is arranged in the observation hole 13, a glass sealing ring 14, tempered glass 15 and a press-fit flange 16 are press-fitted on the groove, and the press-fit flange 16 is fixed to the observation hole 13 by bolts. The maintenance cover plate 11 is provided with an adsorbent, which is arranged on the inside of the tank of the maintenance cover plate 11.

[0037] The embodiment is provided with double observation windows 12 installed on the maintenance cover plate 11. The glass sealing ring 14 is press-fitted in the groove in sequence, which can ensure air tightness, the tempered glass 15 can resist pressure and transmit light, and the press-fit flange 16 provides press-fit force and fixes the tempered glass 15. The press-fit flange 16 is fixed to the observation hole 13 by shield bolts. The maintenance cover plate 11 is provided with a plurality of gas permeable holes, and the installation position on the inside of the tank is provided with an adsorbent assembly. The function is to adsorb moisture and possible arc decomposition products in the tank gas, maintain the insulation performance and purity of the gas. The air tightness of the shielded tank body 4 after being filled with high-voltage insulating gas is ensured.

[0038] It can be seen that the double observation windows 12 provide sufficient light channels for visual inspection, external light supplement or installation of high-speed cameras to record the discharge phenomenon of the test process. The adsorbent continuously purifies the tank gas through the gas permeable holes, ensuring the insulation performance of the gas after multiple tests.

[0039] The gasket of the partition plate 5 is installed between the partition plate 5 and the inner wall of the shielding tank 4 to prevent air leakage between the test area 7 and the observation area 6. Optionally, a conical gasket or a cover gasket can be used for the key interfaces such as the end of the insulation sleeve 8, the maintenance cover 11, etc. to ensure the overall sealing.

[0040] The shielding tank 4 is provided with a gas charging and discharging pipeline 18, and the gas charging and discharging pipeline 18 is provided with a gas charging and discharging valve 19. The gas charging and discharging is used to charge and discharge the insulation gas in the shielding tank 4 and monitor the pressure through a pressure gauge. The air source is connected through a self-sealing valve to charge the air to the required pressure, such as 0.8 MPa. After the test, the exhaust gas is safely recycled through the valve. The insulation gas is conveniently and safely charged and discharged, and the pressure is monitored, which improves the operation safety and efficiency.

[0041] The voltage input end of the combined electrical switch 1 of the embodiment is detachably connected with a voltage input assembly, and is connected to a power supply through the voltage input assembly.

[0042] It should be noted that the voltage input assembly introduces the test power supply into the combined electrical switch 1. The voltage input assembly is detachably connected to the circuit breaker 2 or the bus side of the combined electrical switch 1. The test power supply is connected to the switch body through the voltage input assembly, and then transmitted to the tested part in the shielding tank 4 through the disconnector 3. The detachable connection and the steering function of the bullhead sleeve provide flexibility to adapt to different test site layouts and different electrical phase sequence connection requirements, and simplify the test wiring. It should be noted that the bullhead sleeve is only one form of voltage input, and other devices such as series resonance voltage-withstanding machines can be used for insulation test voltage-withstanding operation through bus or bus isolation port, which is suitable for large-scale standardized interval voltage-withstanding.

[0043] As shown in Figures 7 to 13 , the incoming and outgoing line units requiring cable connection are packaged with shielding voltage-withstanding devices, and the insulation test voltage input assembly is provided with a transition steering mechanism 21, one end of the transition steering mechanism 21 is connected with a transition plug-in mechanism 22, and the other end is connected with a bullhead sleeve mechanism 23. There is a support transition plate 24 between the transition steering mechanism 21 and the transition plug-in mechanism 22, and there is a support insulation plate 25 between the transition steering mechanism 21 and the bullhead sleeve mechanism 23. The support transition plate 24 ensures the stability of the connection; the support insulation plate 25 plays a role in insulation and support, preventing electric leakage.

[0044] The transition steering mechanism 21 is provided with a transition steering conductor 26 inside; the transition plug-in mechanism is provided with a plug-in conductor 27 inside; the bullhead conductor 28 is connected to the plug-in conductor 27 through the bullhead conductor base 30 and the transition steering conductor 26 in sequence; the plug-in conductor 27 is connected to the voltage input end of the combined electrical switch.

[0045] The transition conductor 26 enables electrical conductivity, changing the direction of voltage input to meet the requirements of different sites and phase sequences. In this way, current is conducted through the internal transition conductor 26, while the supporting structure ensures overall stability and insulation.

[0046] In this embodiment, the transition plug-in mechanism 22 has a plug-in conductor 27 inside, which connects to the voltage input terminal of the combined electrical switch 1. This facilitates connection with the combined electrical switch 1, enabling a plug-in connection for voltage input and simplifying installation and disassembly. The plug-in conductor 27 mates with the corresponding interface of the combined electrical switch 1 to achieve electrical connection and transmit current.

[0047] The bullhead bushing mechanism 23 includes a bushing tank 29, inside which a bullhead conductor base 30 is installed. The bushing tank has three through holes, through which a bullhead conductor can be detachably connected. An insulating porcelain insulator 31 or a composite insulating silicone rubber sleeve is fitted over the bullhead conductor. The insulating porcelain insulator 31 ensures insulation. A terminal block 32 is fixedly connected to the top of the bullhead conductor. The terminal block 32 is used for connecting external wiring.

[0048] In this embodiment, the bullhead conductor base 30 is provided with an insulating support plate 33, on which three phase conductors 34 are mounted. The phase conductors 34 are irregularly shaped conduits. The insulating support plate 33 serves as insulation, while the phase conductors 34 are used for conduction.

[0049] like Figure 14 As shown, contact 35 is located at the connection end between phase conductor 34 and head conductor 28. Contact 35 has a cavity 36 for easy fastening, and the bottom end of the cavity 36 is connected to the phase conductor 34 by bolts. At least two conductive springs 37 are installed near the port of contact 35. The conductive springs 37 ensure good electrical contact. External power supply is connected to head conductor 28 through terminal block 32, insulated by insulating porcelain insulator 31, and connected to phase conductor 34 at contact 35 through conductive springs 37, through which current is conducted.

[0050] In this embodiment, the bullhead conductor 28 is connected to the plug-in conductor 27 in sequence through the bullhead conductor base 30 and the transition conductor 26; the plug-in conductor 27 is connected to the voltage input terminal of the combined electrical switch 1.

[0051] In the installation process, the shielded tank 4 is installed on the combined electrical switch 1, and the partition plate 5 is installed inside the shielded tank 4. Here, after the sealing ring is installed in the corresponding position, the body cable tank is preliminarily sealed. The sealing ring plays a sealing role to prevent insulation gas leakage, ensure the pressure and purity of the insulation gas in the shielded tank 4, and maintain a good insulation environment. The shielded tank 4 is a structure for accommodating internal components and providing an insulation test space. The insulation sleeve 8 is installed on the partition plate 5. The observation area 6 of the insulation sleeve 8 is provided with a terminal shield 10 optimized for electric field. This is to optimize the electric field distribution around the insulation sleeve 8 and reduce the local electric field concentration phenomenon to prevent insulation breakdown due to excessive electric field strength. The terminal shield 10 is designed in shape and material to effectively adjust the distribution of electric field lines.

[0052] The gas charging and discharging valve 19 is installed on the shielded tank 4 and is sealed well. Its role is to charge or discharge insulation gas into the tank when needed, and to automatically seal after the operation is completed to prevent gas leakage. Then, the pressure gauge 20 is installed and sealed. The pressure gauge 20 is used to monitor the pressure of the insulation gas in the tank in real time, and the operator can determine whether the pressure in the tank reaches the rated value according to the displayed value.

[0053] The observation window 12 is assembled to the maintenance cover plate 11. The observation window 12 is used for light transmission, light supplementing, and observation during the test process to facilitate monitoring of the conditions in the tank. Then, the adsorbent is assembled to the air vent hole of the maintenance cover plate 11. The adsorbent can adsorb moisture and impurities in the tank to maintain the dryness and purity of the insulation gas in the tank and improve the insulation performance. After ensuring that the two assemblies are airtight, the maintenance cover plate 11 is integrally assembled to the shielded tank 4 to complete the packaging of the entire device.

[0054] During the test preparation process, the shielded tank 4 is evacuated to a certain vacuum degree through the gas charging and discharging valve 19. This is to remove the original impurity gases in the tank to avoid affecting the performance of the insulation gas. Then, a certain pressure of insulation gas medium, such as SF6 or dry compressed air, is charged. After the pressure gauge 20 displays the rated pressure, a stable insulation gas environment is formed in the shielded tank 4, which provides the preliminary conditions for the insulation test.

[0055] Three transition diversion conductors 26 are fixedly assembled at a specific angle. This assembly method can realize a phase sequence change of 90° and further realize the transformation of the phase sequence in space. The conductors are inserted into the conductive spring 37 assembled in the terminal 35. The conductive spring 37 has elasticity, which can ensure good electrical contact between the conductors and the terminal 35 and ensure smooth conduction of the current.

[0056] As Figure 15As shown, the metal flange 41 supporting the outer edge of the insulating plate 25 plays a role of fixing and connecting the mounting component, which can be stably mounted in the corresponding position by connecting members such as bolts. The epoxy resin 42 as an insulating component has the function of isolating the high-voltage conductor and the low-voltage shell to prevent current leakage, and also plays a role of supporting the high-voltage conductor to ensure the stable position of the high-voltage conductor in the device. The metal insert 43 is connected with the high-voltage conductor to realize electrical connection and conduct current, ensuring the conduction of the entire circuit.

[0057] The device of the embodiment can significantly reduce the test area by assembling the access cable tank with the terminal shielding device with an inflation interface, and sealing the whole device. At the same time, after installation, only one side of the bushing is left as the outer leakage high-voltage live part, compared with the traditional pressure-resistant device, the number and range of the outer leakage high-voltage live part are reduced, the safety risk of electric shock of personnel is reduced, and the safety in the test process is improved.

[0058] The outer leakage insulating bushing 8 assembled on the body of the cable tank is completely sealed and packaged, and combined with the measures of filling with insulating gas medium and adsorbing impurities by adsorbent, a good insulation environment can be effectively maintained to ensure the accuracy and reliability of the insulation test. The three transition and turning conductors 26 realize the design of 90° phase sequence change, so that the device has higher flexibility and applicability in different phase sequence test scenarios, and can meet various test requirements. The support insulating plate 25 is stably installed on the device structure through the reasonable design of the metal flange 41, the epoxy resin 42 and the metal insert 43, and realizes reliable electrical connection and insulation function, ensuring stable operation of the whole device.

[0059] It should be understood that when an element or layer is referred to as being "on", "connected to" or "coupled to" another element or layer, it can be directly on, connected or coupled to the other element or layer, or intervening elements or layers can be present. In contrast, when an element is referred to as being "directly on", "directly connected to" or "directly coupled to" another element or layer, there are no intervening elements or layers present. Like numbers refer to like elements throughout the drawings. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0060] Spatially relative terms, such as "under", "below", "lower", "over", "upper" and the like, can be used herein for ease of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is inverted, elements described as "under" or "beneath" other elements or features would then be oriented "over" the other elements or features. Thus, the exemplary term "below" can encompass both an orientation of over and under. The device can be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

[0061] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present document. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising", when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0062] The above description of disclosed embodiments provides examples, and is not intended to limit the scope, applicability, or configuration of the disclosure. Various modifications can occur to those skilled in the art to which the disclosure relates; however, the scope of the disclosure is commensurate with the broadest interpretation of the principles defined herein. Therefore, the embodiments described hereinabove are meant to be methods and / or apparatus only used and or on various embodiments, and the present disclosure is intended to include all such modifications and examples without materially departing from the spirit and scope of the disclosure as defined in the claims.

Claims

1. An insulation test shield voltage-withstanding device for a combination electrical appliance switch, comprising: The combined electric appliance switch is characterized in that the combined electric appliance switch is provided with a circuit breaker and at least two disconnectors connected with the circuit breaker respectively; The cable tank output end connected with each disconnector is detachably connected with a shielding tank body; A partition is installed inside the shielding tank body, one side of the partition is an observation area and a test area, an insulating sleeve is installed on the partition, and one end of the test area of the insulating sleeve is connected to the output end of the disconnector; One end of the observation area of the insulating sleeve is provided with a terminal shielding piece; One end of the observation area of the shielding tank body is provided with an inspection cover plate, and an observation window is installed on the inspection cover plate; The voltage input end of the combined electric appliance switch is detachably connected with a voltage input assembly, and is connected to a power supply through the voltage input assembly.

2. The combined electric appliance switch insulation test shield voltage-withstanding device according to claim 1, characterized by, A sealing ring is installed between the inner wall of the cable tank and the shielding tank body; One end of the test area of the insulating sleeve is connected to the output end of the disconnector through a special-shaped conduit.

3. The combined electric appliance switch and insulation test shield voltage-withstanding device according to claim 1, characterized by A gas charging pipeline is installed on the shielding tank body, and a gas charging valve and a pressure gauge are installed on the gas charging pipeline.

4. The combined electric appliance switch and insulation test shield voltage-withstanding device according to claim 1, characterized by An observation hole is formed at the position of the observation window of the inspection cover plate, a groove is arranged in the observation hole, a glass sealing ring, tempered glass and a crimping flange are crimped on the groove, and the crimping flange is fixed to the observation hole through bolts.

5. The combined electric appliance switch and insulation test shield voltage-withstanding device according to claim 1, characterized by An adsorbent is installed on the inspection cover plate, and the adsorbent is arranged on the inner side of the tank of the inspection cover plate.

6. The combined electric appliance switch and insulation test shield voltage-withstanding device according to claim 1, characterized by The voltage input assembly is provided with a transition turning mechanism, one end of the transition turning mechanism is connected with a transition plug-in mechanism, and the other end is connected with a bullhead sleeve mechanism; The bullhead sleeve mechanism is provided with a sleeve tank body, a bullhead conductor base is arranged inside the sleeve tank body; three through holes are formed on the sleeve tank body, and a bullhead conductor is detachably connected with the through holes, and an insulating porcelain bottle is sleeved outside the bullhead conductor; The bottom end of the bullhead conductor is connected with the bullhead conductor base, and the top end of the bullhead conductor is fixedly connected with a terminal block.

7. The combined electric appliance switch and insulation test shield voltage-withstanding device according to claim 6, characterized by The bullhead conductor base is provided with an insulating support plate, Three phase conductors are installed on the insulating support plate, and the phase conductors adopt special-shaped conduits; The connecting end of the phase conductor and the conductor is provided with a contact seat; The contact seat is provided with a cavity, and the bottom end of the cavity is connected with the phase conductor through bolts; At least two conductive springs are installed near the port of the contact seat.

8. The combined electric appliance switch and insulation test shield voltage-withstanding device according to claim 6, characterized by A transition turning conductor is arranged inside the transition turning mechanism; A plug-in conductor is arranged inside the transition plug-in mechanism; The bullhead conductor is connected to the plug-in conductor through the bullhead conductor base and the transition turning conductor in sequence; The plug-in conductor is connected with the voltage input end of the combined electric appliance switch.

9. The insulation test shielding voltage resistance device for the combined electric appliance switch according to claim 8, characterized in that, A support transition plate is arranged between the transition turning mechanism and the transition plug-in mechanism; A support insulating plate is arranged between the transition turning mechanism and the bullhead sleeve mechanism; A metal flange is arranged on the outer edge of the support insulating plate, and an epoxy resin and a conductive metal insert are arranged on the support insulating plate; The support transition plate is provided with a transition turning conductor.

10. The insulation test shielding voltage resistance device for the combined electric appliance switch according to claim 1, characterized in that, The cross section of the terminal shielding piece is T-shaped, the vertical section of the terminal shielding piece is provided with threads, and the threads are connected to the inside of the insulating sleeve; and the horizontal section of the terminal shielding piece is a circular arc transition head.

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