Combined cover plate and switch device using same

Abstract

The utility model relates to the field of electrical performance testing for testing dielectric strength or breakdown voltage, in particular to a combined cover plate and switch equipment using the combined cover plate. The combined cover plate comprises a cover plate body, a flange connecting hole used for being connected with a reserved flange plate on a GIS shell is formed in the cover plate body, an induction electrode used for partial discharge testing is installed in the middle of the inner side of the cover plate body, and the induction electrode is electrically connected with a cable connector arranged on the outer side of the cover plate body. A water adsorption assembly is further arranged on the inner side of the cover plate body, the water adsorption assembly comprises an annular adsorbent shell and an adsorbent arranged in the adsorbent shell, the adsorbent shell is arranged around the induction electrode, and the height of the adsorbent shell on the cover plate body is smaller than the protruding height of the induction electrode relative to the cover plate body. According to the utility model, the problems that the installation steps required by the GIS partial discharge test and water adsorption are complicated and the GIS shell is easy to leak air are solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of electrical performance test of dielectric strength or breakdown voltage, especially to a kind of combination cover plate and switchgear using the combination cover plate. BACKGROUND

[0002] As a kind of gas-insulated switchgear, GIS uses SF6 as insulation medium, with many advantages such as small footprint, high operation reliability, long maintenance cycle, easy transportation and installation, etc., and has been widely used in power transmission and distribution field. With the continuous expansion of application range, the operation reliability of GIS equipment has increasingly become the focus of international community and power department. Based on nearly half a century of operation practice, insulation failure has always been one of the key factors restricting the improvement of GIS reliability.

[0003] The partial discharge monitoring and gas chamber moisture treatment of GIS equipment are important means to ensure its insulation performance, among which the partial discharge monitoring is realized through partial discharge sensor, and the moisture treatment is realized through water adsorption device. Generally, the partial discharge sensor and water adsorption structure assembly are separately configured on the GIS shell, with built-in partial discharge sensor on one side of the GIS shell and water adsorption device on the other side.

[0004] As shown in Figure 1 , the partial discharge sensor includes sensor installation cover plate 1, which is a circular cover plate and can be sealingly connected with the pre-set flange on the GIS shell through connecting bolt 2 in use. Insulating plate 4 is fixedly installed on the inner side of sensor installation cover plate 1 through compression bolt 3, and sealingly cooperates with sensor cover plate 1 through the sealing ring on the side of insulating plate 4 close to sensor installation cover plate 1. Induction electrode 5 is installed on sensor cover plate 1, and adapter conductor 6 is sealingly installed at the center of insulating plate 4. Induction electrode 5 is fixedly installed on insulating plate 4 through fastening bolt 7, one end of adapter conductor 6 is connected with induction electrode 5, and the other end is connected with cable joint 8 at the outer side of sensor installation cover plate 1. In use, the above-mentioned components such as induction electrode 5, insulating plate 4 and adapter conductor 6 can be combined and connected to the GIS shell as a whole through connecting bolt 2.

[0005] The structure of water adsorption device is shown in Figure 2 , which includes water adsorption cover plate 10, which is also a circular cover plate and can be sealingly connected with the pre-set flange on the GIS shell through connecting bolt 2 in use. A U-shaped adsorbent shell 20 is arranged on the inner side of water adsorption cover plate 10, and an adsorbent is arranged in the adsorbent shell 20. In use, the adsorbent, adsorbent shell 20 and water adsorption cover plate 10 can be assembled as a whole and connected to the GIS shell through connecting bolt 2.

[0006] From the above description, it can be seen that since the partial discharge monitoring sensor and the water adsorption device are installed separately, two mounting holes need to be opened on the GIS shell, which not only increases the risk of gas leakage, but also requires two times of installation to complete the installation of the partial discharge sensor and the water adsorption structure, more parts and more assembly processes, which is not conducive to improving the production and assembly efficiency.

[0007] In addition, especially for old stations, a large number of existing GIS devices are not configured with partial discharge sensors. With the increasing requirement of the power grid system on the insulation reliability of GIS devices, more and more power stations choose to transform the old devices and add partial discharge sensors. However, due to the early design, no partial discharge sensor installation position is reserved, resulting in difficulty in installing the partial discharge sensor. Practical new type content

[0008] The utility model discloses a kind of combined cover plates, to solve the problem that GIS partial discharge test and water absorption need installation step complex, easily lead to GIS shell gas leakage.

[0009] Meanwhile, the utility model also provides a kind of switch device comprising the above combined cover plate, to solve the above problems.

[0010] In order to solve the above problems, the combined cover plate of the utility model adopts the following technical scheme: the combined cover plate includes a cover plate body, a flange connection hole for connecting with the reserved flange plate on the GIS shell is arranged on the cover plate body, an induction electrode for partial discharge test is installed in the middle of the inner side of the cover plate body, the induction electrode is electrically connected with the cable joint arranged on the outer side of the cover plate body, a water adsorption assembly is also arranged on the inner side of the cover plate body, the water adsorption assembly includes an annular adsorbent shell and an adsorbent arranged in the adsorbent shell, the adsorbent shell is arranged around the induction electrode, and the height of the adsorbent shell on the cover plate body is less than the protruding height of the induction electrode relative to the cover plate body.

[0011] Further, the adsorbent shell includes an inner ring body and an outer ring body arranged at intervals, and a shell bottom connected between the inner ring body and the outer ring body.

[0012] Further, the cross section of the shell bottom is U-shaped, and covers the inner ring body and the outer ring body.

[0013] Further, the inner ring body and the outer ring body are both meshed ring bodies.

[0014] Further, one end of the outer ring body close to the cover plate body is provided with a connecting edge extending to the radial periphery.

[0015] Further, an insulating plate is arranged in the middle of the inner side of the cover plate body, and the induction electrode is installed on the cover plate body through the insulating plate.

[0016] Further, the insulating plate is fixedly installed on the cover plate body by connecting bolts, and a switching conductor electrically connected with the induction electrode is arranged at the center of the insulating plate.

[0017] Further, a conical boss is arranged on the side of the insulating plate away from the cover plate body, and the induction electrode is installed on the conical boss.

[0018] Further, a countersunk hole is arranged on the induction electrode, and the induction electrode is connected with the switching conductor by a connecting screw in the countersunk hole.

[0019] Beneficial effects: the combined cover plate is a combined invention. Specifically, the induction electrode for partial discharge test and the water adsorption assembly for adsorbing moisture are integrated on a cover plate body, the adsorbent shell of the water adsorption assembly is arranged in a ring shape around the induction electrode, the arrangement requirements of the water adsorption assembly and the induction electrode are met in space, and since the height of the adsorbent shell on the cover plate body is less than the height of the induction electrode on the cover plate body, the adsorbent assembly arranged around the induction electrode will not affect the induction of the induction electrode on the partial discharge phenomenon, and naturally, the induction electrode will not affect the normal work of the adsorbent assembly. In use, the combined cover plate can be installed on the GIS shell as a whole, and partial discharge measurement and water adsorption can be realized at the same time through one-time installation, and the problem of complex installation steps required for GIS partial discharge test and water adsorption, which easily leads to air leakage of the GIS shell, is solved.

[0020] The switch device adopts the following technical scheme:

[0021] The switch device comprises a GIS shell, a combined cover plate is installed on the GIS shell, the combined cover plate comprises a cover plate body, a flange connecting hole for connecting with a reserved flange plate on the GIS shell is arranged on the cover plate body, an induction electrode for partial discharge test is installed at the middle part of the inner side of the cover plate body, the induction electrode is electrically connected with a cable joint arranged on the outer side of the cover plate body, a water adsorption assembly is further arranged on the inner side of the cover plate body, the water adsorption assembly comprises an annular adsorbent shell and adsorbent arranged in the adsorbent shell, the adsorbent shell is arranged around the induction electrode and the height of the adsorbent shell on the cover plate body is less than the protruding height of the induction electrode relative to the cover plate body.

[0022] Further, the adsorbent shell comprises an inner ring body and an outer ring body arranged at intervals and a shell bottom connected between the inner ring body and the outer ring body.

[0023] Further, the cross section of the shell bottom is U-shaped and covers the inner ring body and the outer ring body.

[0024] Further, the inner ring body and the outer ring body are both mesh ring bodies.

[0025] Further, one end of the outer ring body close to the cover plate body is provided with a connecting edge extending to the radial periphery.

[0026] Further, the middle part of the inner side of the cover plate body is provided with an insulating plate, and the induction electrode is installed on the cover plate body through the insulating plate.

[0027] Further, the insulating plate is fixedly installed on the cover plate body through connecting bolts, and an adapter conductor electrically connected with the induction electrode is arranged in the center of the insulating plate.

[0028] Further, the side of the insulating plate away from the cover plate body is provided with a conical boss, and the induction electrode is installed on the conical boss.

[0029] Further, the induction electrode is provided with a countersunk hole, and the induction electrode is connected with the adapter conductor through a connecting screw in the countersunk hole.

[0030] Beneficial effects: the switch device is an improved invention. Specifically, in the switch device, the induction electrode for partial discharge test and the water adsorption assembly for adsorbing moisture are integrated on a cover plate body, the adsorbent shell of the water adsorption assembly is arranged in a ring shape around the induction electrode, the arrangement requirements of the water adsorption assembly and the induction electrode are met in space, and since the height of the adsorbent shell on the cover plate body is less than the height of the induction electrode on the cover plate body, the adsorbent assembly arranged around the induction electrode will not affect the induction of the induction electrode on the partial discharge phenomenon, and naturally, the induction electrode will not affect the normal work of the adsorbent assembly. In use, the combined cover plate can be installed on the GIS shell as a whole, and the partial discharge measurement and water adsorption can be realized at the same time through one-time installation, and the problem that the installation steps required for GIS partial discharge test and water adsorption are complex and easy to cause the GIS shell to leak is solved. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 is a structural schematic view of an existing partial discharge sensor;

[0032] Figure 2 is a structural schematic view of an existing water adsorption device;

[0033] Figure 3 is a structural schematic view of one embodiment of the combined cover plate of the utility model.

[0034] Figures 1-2In the middle: 1, sensor installation cover plate; 2, connecting bolt; 3, compression bolt; 4, insulating plate; 5, induction electrode; 6, adapter conductor; 7, fastening bolt; 8, cable joint; 10, water adsorption cover plate; 20, adsorbent housing.

[0035] Figure 3 In the middle: 101, GIS housing; 102, cover plate body; 103, water adsorption assembly; 31, adsorbent housing; 32, adsorbent; 104, induction electrode; 105, cable joint; 106, insulating plate; 107, connecting bolt; 108, connecting screw; 109, adapter conductor; 110, compression screw; 111, protective cover; 112, pipe joint. DETAILED DESCRIPTION

[0036] The features and performances of the utility model are described in further detail below in combination with embodiments.

[0037] The GIS uses inert gases such as sulfur hexafluoride as insulating medium, so the GIS housing 101 is full of insulating gas, and in order to ensure a certain insulating capacity, the insulating gas is also required to have a certain pressure, so the sealing performance of the GIS housing 101 must be guaranteed. Based on the requirement for sealing, generally, as few holes as possible are made on the GIS housing 101 to control the number of leakage risk points.

[0038] In the prior art, the partial discharge sensor for partial discharge measurement and the water adsorption device for adsorbing impurities such as water are both installed through separate cover plates, which requires making holes on the GIS housing 101 respectively, which is obviously in conflict with the requirement for ensuring the sealing performance as mentioned above. In particular, because the partial discharge measurement technology is gradually proposed along with the continuous development of switchgear technology, the switchgear produced before the partial discharge measurement technology was proposed often does not have a hole for installing the partial discharge sensor, and when the partial discharge sensor needs to be installed during the later modification, the modification process will be extremely complex. Therefore, if the partial discharge measurement device and the water adsorption device can be integrated, the installation of the above two functional modules is realized through one cover plate, and the partial discharge measurement module and the water adsorption module share one installation hole, then the above series of problems will be solved.

[0039] Based on the above invention concept, one basic embodiment of the combined cover plate of the utility model is as follows:

[0040] As a typical embodiment, the combined cover plate of the utility model includes a cover plate body 102, which is a plate structure, and on one hand serves as a carrier for the water adsorption assembly 103 and the induction electrode 104 for installing the water adsorption assembly 103 and the induction electrode 104, and on the other hand plays a role in sealing the installation hole on the GIS housing 101. For example, Figure 3As shown, in a preferred embodiment, the cover plate body 102 adopts a circular cover plate, which is consistent in shape and size with the flange at the mounting hole reserved on the GIS shell 101, and after being connected with the GIS shell 101, the appearance can be guaranteed to be beautiful, and the circular cover plate body 102 has a smooth outer peripheral surface without sharp corners and other structures, which can avoid hurting people and save the material of the cover plate body 102. Of course, based on the basic functions to be realized by the cover plate body 102, in other embodiments, the cover plate body 102 can also adopt any other arbitrary shape, as long as it can cover the corresponding flange plate on the GIS shell 101.

[0041] A joint mounting hole is arranged at the center position of the cover plate body 102, and a cable joint 105 is mounted in the joint mounting hole, which is used to be connected with the partial discharge testing instrument to facilitate the partial discharge monitoring of the GIS. Since the depth of the joint mounting hole is greater than the installation depth of the cable joint 105, in order to prevent the short circuit between the conductor inside the cable joint 105 and the cover plate body 102, the inner end of the joint mounting hole is provided with a tapered flared structure.

[0042] An induction electrode 104 for partial discharge test is mounted in the middle of the inner side of the cover plate body 102, which is a core component for partial discharge monitoring. In order to realize the insulation cooperation between the induction electrode 104 and the cover plate body 102, an insulating plate 106 is arranged on the cover plate body 102, which is fixedly installed on the cover plate body 102 through connecting bolts 107, and the induction electrode 104 is fixed to the insulating plate 106 through a connecting screw 108 arranged at the center position thereof, in other words, the induction electrode 104 is installed on the cover plate body 102 through the insulating plate 106.

[0043] In a preferred embodiment, as shown, Figure 3 The inner side of the insulating plate 106 is provided with a tapered boss, which can be used to increase the creepage distance between the induction electrode 104 and the cover plate body 102, thereby reducing the size of the insulating plate 106 in the radial direction, and occupying as little area as possible on the inner side of the cover plate body 102, so as to leave enough space to install the water adsorption assembly 103. In other embodiments, the insulating plate 106 can also be provided as a flat plate, and the thickness thereof is designed to meet the insulation distance requirement.

[0044] The center position of the insulating plate 106 is fixedly embedded with a switching conductor 109, the outer end of which is connected with the cable joint 105, and the inner end extends to the inner side of the insulating plate 106. The above-mentioned connecting screw 108 is connected on the switching conductor 109, which realizes the installation of the induction electrode 104 to the insulating plate 106, and also realizes the electrical connection between the induction electrode 104 and the switching conductor 109.

[0045] A water adsorption assembly 103 is arranged on the inner side of the cover plate body 102, which comprises a ring-shaped adsorbent shell 31 and an adsorbent 32 arranged in the adsorbent shell 31.

[0046] As shown in the drawings, in a preferred embodiment, the adsorbent shell 31 comprises an inner ring body and an outer ring body arranged at intervals and a shell bottom connected between the inner ring body and the outer ring body. Figure 3 By arranging the adsorbent shell 31 in the form of the inner ring body, the outer ring body and the shell bottom, the manufacturing process of the adsorbent shell can be simplified, and the structure thereof is simplified.

[0047] On the basis of the above-mentioned embodiments, as a protective measure for the cable joint 105, a protective cover 111 is arranged on the outer side of the cover plate body 102, which comprises a cylindrical cover body and a cover lid arranged on the cover body.

[0048] The embodiment of the switchgear of the utility model:

[0049] The switchgear of the utility model comprises a GIS shell 101, and the combined cover plate of the utility model is installed on the GIS shell 101.

[0050] The above merely describes preferred embodiments of the present application, and is not used to limit the present application, and the patent protection scope of the present application is subject to the claims, and any equivalent structural changes made according to the content of the specification and drawings of the present application should also be included in the protection scope of the present application.

Claims

1. A composite cover plate characterized by, The combined cover plate comprises a cover plate body, a flange connecting hole for connecting with a reserved flange plate on a GIS shell, an induction electrode for partial discharge test installed in the middle of the inner side of the cover plate body, the induction electrode being electrically connected with a cable joint arranged on the outer side of the cover plate body, a water adsorption assembly arranged on the inner side of the cover plate body, the water adsorption assembly comprising an annular adsorbent shell and an adsorbent arranged in the adsorbent shell, the adsorbent shell being arranged around the induction electrode and having a height on the cover plate body less than the protruding height of the induction electrode relative to the cover plate body.

2. The combination cover plate of claim 1, wherein, The adsorbent shell comprises an inner ring body and an outer ring body arranged at intervals and a shell bottom connected between the inner ring body and the outer ring body.

3. The combination cover plate of claim 2, wherein, The shell bottom is U-shaped in cross section and covers the inner ring body and the outer ring body.

4. The combination cover plate of claim 2 or 3, wherein, The inner ring body and the outer ring body are both mesh ring bodies.

5. The combination cover plate of claim 2 or 3, wherein, An end of the outer ring body close to the cover plate body is provided with a connecting edge extending to the radial periphery.

6. The combination cover plate of any one of claims 1-3, wherein, The middle of the inner side of the cover plate body is provided with an insulating plate, and the induction electrode is installed on the cover plate body through the insulating plate.

7. The combination cover plate of claim 6, wherein, The insulating plate is fixedly installed on the cover plate body by connecting bolts, and a switching conductor electrically connected with the induction electrode is arranged in the center of the insulating plate.

8. The combination cover plate of claim 7, wherein, The side of the insulating plate away from the cover plate body is provided with a conical boss, and the induction electrode is installed on the conical boss.

9. The combination cover plate of claim 7, wherein, A countersunk hole is arranged on the induction electrode, and the induction electrode is connected with the switching conductor by a connecting screw in the countersunk hole.

10. Switchgear comprising a GIS housing, characterized in that The GIS shell is provided with the combined cover plate according to any one of claims 1-9.

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