Cable voltage withstanding device

Abstract

The utility model discloses a cable voltage withstanding device, which comprises a gas box, a grounding sleeve, a three-position switch, a circuit breaker, a ring network inlet wire sleeve, a lower branch bus and an externally connected ring network inlet wire cable which are arranged in a ring network power supply unit and form a loop to be tested, the cable test device comprises an outer shell arranged on the outer side of a gas tank, a grounding bus, a disconnecting link assembly and a pair of supporting bent plates are arranged in the outer shell, the disconnecting link assembly is connected with the grounding bus through flexible connection, the two ends of the disconnecting link assembly are rotationally connected with the pair of supporting bent plates, and the supporting bent plates are arranged on the outer side of the gas tank. The utility model relates to the technical field of power switches, and can complete a loop grounding function and confirm that a cable is in a non-power state through switching-on and switching-off operations of a knife switch assembly, and also can complete a cable voltage withstand test function without dismounting the cable, and then carry out the voltage withstand test, thereby avoiding the high voltage crossing in a power supply system. And the safety of power supply is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to power switch technical field, concretely is a cable pressure resistance device. BACKGROUND

[0002] In the power system, after the connection of cable and equipment is operated, in order to ensure the safety and reliability of system, power frequency withstand voltage test needs to be carried out every year. This test is an important part of preventive test, is used to detect the insulation performance of cable, ensures its safe operation under high voltage. However, the existing withstand voltage test method has some problems in actual operation:

[0003] Convenient to disassemble and assemble: traditional withstand voltage test usually needs to disassemble cable from equipment, and reassembles after test. This process not only consumes time and effort, but also easily damages cable terminal, increases maintenance cost and safety risk;

[0004] Low safety: in the process of disassembly and assembly, operating personnel need to contact high voltage equipment, there is the risk of electric shock, in addition, improper disassembly and assembly can cause the connection between cable and equipment to be loose, affect the normal operation of system;

[0005] Low test efficiency: each test needs to disassemble and assemble cable repeatedly, not only increases test time, but also reduces test efficiency, especially in the scene needing to carry out test frequently, this problem is particularly prominent;

[0006] In order to solve the above problems, the utility model provides a cable pressure resistance device. CONTENT OF UTILITY MODEL

[0007] In view of the deficiency of prior art, the utility model provides a cable pressure resistance device, solves the problem of time-consuming and laborious in the process of existing cable power frequency withstand voltage test.

[0008] To achieve the above purpose, the utility model is realized by the following technical scheme: a cable pressure resistance device, including the air tank that is arranged in the looped network power supply unit and constitutes the loop to be tested, ground bushing, three-position switch, circuit breaker, looped network incoming line bushing, lower branch bus and the looped network incoming line cable connected externally, the cable test device is equipped outside the air tank, the cable test device includes the outer shell body arranged outside the air tank, the outer shell body is equipped with the grounding bus, the knife gap assembly and a pair of support bent plates, the knife gap assembly is connected with the grounding bus through the soft connection, and the both ends of the knife gap assembly are rotatably connected with a pair of support bent plates;

[0009] The grounding bushing includes an epoxy resin sleeve and a grounding static contact arranged in the epoxy resin sleeve, the upper end of the grounding static contact is located in the air tank, and the grounding static contact is used as the grounding static contact of the three-position switch, the lower end is located outside the air tank and extends into the outer shell body, and is used as the grounding static contact of the cable test device.

[0010] Preferably, the knife switch assembly is a three-phase structure, each phase is installed by two mirror image clamping blades, the bent end of one side of the clamping blade is fixed on the short-circuit bus, the other end is provided with a pressing spring, the pressing spring is pressed on one side of the spring end, a limiting shaft sleeve for limiting the distance is arranged between the two clamping blades, and the short-circuit bus is connected to the grounding bus through a flexible connection.

[0011] Preferably, the left and right sides of the short-circuit bus are respectively fixed with a left transition rotating shaft and a right transition rotating shaft, and the rotating shafts jointly constitute a rotating shaft of the knife switch assembly, and the rotating shaft is installed on a support bent plate and can rotate around a hole on the support bent plate.

[0012] Preferably, the air tank is integrally connected with the outer shell.

[0013] Preferably, the grounding bus is connected to the system grounding row of the ring network power supply unit through the grounding sleeve at the right end.

[0014] Beneficial effects

[0015] The cable pressure-resistant device has the following beneficial effects:

[0016] (1) The closing and opening operations of the knife switch assembly can complete the loop grounding function, confirm that the cable is in a non-electric state, and realize the function of completing the cable pressure test without disassembling the cable.

[0017] (2) The cable pressure test is performed by confirming that the cable is in a non-electric state, which avoids high-voltage power transmission in the power supply system and improves the safety of power supply.

[0018] (3) The environmental protection type 11kV ring network power supply unit is integrally designed, the grounding sleeve is shared by the partition combination switch in the inflatable compartment and the cable test device outside the inflatable compartment, the structure is compact, and the cost is low. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a cable test device installation schematic view

[0020] Figure 2 is a cable test device installation schematic view without an outer shell;

[0021] Figure 3 is a cable test device internal structure view;

[0022] Figure 4 is a knife switch assembly;

[0023] Figure 5 is a grounding sleeve;

[0024] Figure 6is a closing schematic diagram of the cable testing device;

[0025] Figure 7 is an opening schematic diagram of the cable testing device.

[0026] In the figure: 1, cable testing device; 11, knife switch assembly; 111, clamping blade; 112, shorting bus; 113, right transition rotating shaft; 114, pressing spring; 115, limiting shaft sleeve; 116, left transition rotating shaft; 117, outer shell; 12, grounding bus; 13, supporting bent plate; 14, flexible connection; 15, grounding sleeve; 2, grounding sleeve; 21, grounding static contact; 22, epoxy resin sleeve; 3, three-position switch; 4, circuit breaker; 5, lower supporting bus; 6, ring network incoming line sleeve; 7, gas tank; 8, ring network incoming line cable. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0028] Please refer to Figures 1-7 The present application provides a technical solution: a cable pressure-resistant device, which comprises a gas tank 7, a grounding sleeve 2, a three-position switch 3, a circuit breaker 4, a ring network incoming line sleeve 6, a lower supporting bus 5 and a ring network incoming line cable 8 which are arranged in a ring network power supply unit and constitute a to-be-tested loop, and the gas tank 7 is externally provided with a cable testing device 1, the cable testing device 1 comprises an outer shell 117 arranged outside the gas tank 7, the outer shell 117 is internally provided with a grounding bus 12, a knife switch assembly 11 and a pair of supporting bent plates 13, the knife switch assembly 11 is connected with the grounding bus 12 through a flexible connection 14, and the two ends of the knife switch assembly 11 are rotationally connected with the pair of supporting bent plates 13.

[0029] The grounding sleeve 2 comprises an epoxy resin sleeve 22 and a grounding static contact 21 arranged in the epoxy resin sleeve 22, the upper end of the grounding static contact 21 is located in the interior of the gas tank 7, and the grounding static contact 21 serves as a grounding static contact of the three-position switch 3, and the lower end of the grounding static contact 21 is located in the exterior of the gas tank 7 and extends into the outer shell 117, and the grounding static contact 21 serves as a grounding static contact of the cable testing device 1.

[0030] By adopting the technical scheme, the closing and opening operations of the knife switch assembly 11 can not only complete the loop grounding function and confirm that the cable is in a non-electric state, but also complete the cable withstand voltage test without disassembling the cable, and the safety of power supply in the high-voltage power transmission system is improved by confirming that the cable is in a non-electric state, the grounding sleeve 2 is shared by the combined switch in the air-filled compartment and the cable test device 1 outside the air-filled compartment, the structure is compact, and the cost is low.

[0031] In this embodiment, the knife switch assembly 11 is of a three-phase structure, each phase is mirror-installed by two clamping blades 111, the bent end of one side of the clamping blade 111 is fixed on a short-circuit bus 112, the other end is provided with a pressing spring 114, the pressing spring 114 is pressed on one side of the spring end, a limiting shaft sleeve 115 for limiting the distance is arranged between the two clamping blades 111, and the short-circuit bus 112 is connected to the grounding bus 12 through a flexible connection 14.

[0032] By adopting the technical scheme, the design of the clamping blade 111 ensures reliable contact of the knife switch assembly 11 when closing, and the pressing spring 114 provides additional pressing force to ensure good contact.

[0033] In this embodiment, the left and right sides of the short-circuit bus 112 are respectively fixed with a left transition rotating shaft 116 and a right transition rotating shaft 113, which together constitute a rotating shaft of the knife switch assembly 11, and the rotating shaft is installed on a support bent plate 13 and can rotate around a hole on the support bent plate 13.

[0034] By adopting the technical scheme, the design of the rotating shaft makes the knife switch assembly 11 flexible to rotate, which is convenient for closing and opening operations, and the support bent plate 13 provides stable support to ensure the stability of the knife switch assembly 11 during rotation.

[0035] In this embodiment, the air tank 7 and the outer shell 117 are integrally formed and connected.

[0036] By adopting the technical scheme, the integrally formed design makes the air tank 7 and the outer shell 117 closely combined, reduces the connection parts, and improves the overall stability and reliability.

[0037] In this embodiment, the grounding bus 12 is connected to the system grounding row of the looped network power supply unit through a grounding sleeve 15 at the right end.

[0038] By adopting the technical scheme, the grounding bus 12 is connected to the system grounding row through the grounding sleeve 15, which ensures the reliability and safety of grounding.

[0039] By the skilled in the art, the parts in the case are connected in turn, the specific connection and the operation order should be referred to the following working principle, the detailed connection means is the public known technology in the art, the following mainly introduces the working principle and the process.

[0040] Embodiment: according to Figures 1-6 As shown in the figure, when the knife switch assembly 11 is closed, the three-position switch 3 is closed, the circuit breaker 4 is closed, the external ring network incoming cable 8 completes grounding through the ring network incoming cable sleeve 6, the lower branch bus 5, the circuit breaker 4, the three-position switch 3, the grounding sleeve 2, the movable knife switch assembly 11, and can withstand the dynamic thermal stability current of the grounding loop, at this time, it can be confirmed that the ring network incoming cable 8 is in a no-electricity state, that is, the upper switch of the cable is in an open state and is disconnected with the system.

[0041] According to Figure 7 As shown in the figure, when the knife switch assembly 11 is opened, the cable test voltage can be applied at the lower end of the grounding sleeve 2 located outside the air tank 7. The outer insulation of the grounding sleeve 2 can withstand the insulation stress of the power frequency withstand voltage. The cable test voltage is applied to the ring network incoming cable 8 through the grounding sleeve 2, the three-position switch 3 in the closed state, the circuit breaker 4, the lower branch bus 5, and the ring network incoming cable sleeve 6, thereby realizing the power frequency withstand voltage test of the cable without disassembling the cable.

[0042] Through the above design, the cable withstand voltage device realizes the effects of multifunctional integration, safety and reliability, and compact structure. Through the closing and opening operations of the knife switch assembly, the loop grounding function can be completed, and it can be confirmed that the cable is in a no-electricity state, and the cable withstand voltage test function can be realized without disassembling the cable. This design not only improves the convenience and safety of the test, but also reduces the damage to the cable terminal in the disassembly process, and is suitable for preventive tests of power systems. The overall structure is compact and easy to operate, and has high practical value.

[0043] It should be noted that, in this text, relational terms such as first and second are used merely to distinguish one entity or action from another, without necessarily requiring or implying any such actual relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variations thereof are intended to cover non-exclusive inclusions, so that a process, method, article, or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such a process, method, article, or equipment. Without more limitations, the statement "including a limited element" does not exclude the presence of additional identical elements in the process, method, article, or equipment including the element.

[0044] Although the embodiments of the present application have been shown and described, it is to be understood that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A cable pressure device, comprising a gas tank (7) arranged in a ring network power supply unit and constituting a loop to be tested, a grounding sleeve (2), a three-position switch (3), a circuit breaker (4), a ring network incoming line sleeve (6), a lower branch bus (5), and an externally linked ring network incoming line cable (8), characterized in that the gas tank (7) is externally provided with a cable testing device (1), the cable testing device (1) comprises an outer shell (117) arranged outside the gas tank (7), the outer shell (117) is internally provided with a grounding bus (12), a knife switch assembly (11), and a support bent plate (13), the knife switch assembly (11) is connected to the grounding bus (12) through a flexible connection (14), and both ends of the knife switch assembly (11) are rotationally connected to the support bent plate (13). The grounding sleeve (2) comprises an epoxy sleeve (22) and a grounding static contact (21) arranged in the epoxy sleeve (22), the upper end of the grounding static contact (21) is located inside the gas tank (7), and the lower end of the grounding static contact (21) is located outside the gas tank (7) and extends into the outer shell (117), and the grounding static contact (21) serves as a grounding static contact (21) of the three-position switch (3).

2. The cable pressure-resistant device according to claim 1, characterized in that The knife switch assembly (11) is of a three-phase structure, each phase is mirror-installed by two clamping blades (111), the bent end of one side of the clamping blade (111) is fixed on a short-circuit bus (112), the other end is provided with a pressing spring (114), the pressing spring (114) is pressed on the end of the clamping blade (111), a limiting shaft sleeve (115) for limiting the distance is arranged between the two clamping blades (111), and the short-circuit bus (112) is connected to the grounding bus (12) through the flexible connection (14).

3. A cable pressure-resistant device according to claim 2, characterized in that The left and right sides of the short-circuit bus (112) are respectively fixed with a left transition rotating shaft (116) and a right transition rotating shaft (113), which together constitute a rotating shaft of the knife switch assembly (11), and the rotating shaft is installed on the support bent plate (13) and can rotate around the hole on the support bent plate (13).

4. The cable pressure-resistant device according to claim 1, wherein The gas tank (7) is integrally connected with the outer shell (117).

5. A cable pressure-resistant device according to claim 4, characterized in that The grounding bus (12) is connected to the system grounding row of the ring network power supply unit through a grounding sleeve (15) at the right end.

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