CN202119867U - Built-in coupler for measuring GIS partial discharge - Google Patents

Abstract

The utility model relates to a built-in coupler for measuring GIS partial discharge, which includes an induction electrode and an insulating plate for fixing between the cylinder cover plate and the induction electrode. The connection hole for directly fixing the plates together, the center of the sensing electrode is provided with a mounting hole for fixing the sensing electrode and the insulating plate together, the center of the insulating plate is provided with an electrical connector, one end of the electrical connector is connected to the sensing electrode, and the other end is used for Connect with cable gland. The utility model separates and fixes the insulation plate and the induction electrode from the cover plate of the cylinder body, and sets connection holes on the insulation plate, directly fixes the insulation plate on the cover plate of the cylinder body, fixes the induction electrode with the insulation plate, and is electrically connected with the cable joint, avoiding The contact between the metal and the sensing electrode when the metal bolt passes through the insulating pad and the sensing electrode simultaneously in the prior art is eliminated, the problem of too close distance between the metal bolt and the sensing electrode is solved, and the detection sensitivity of the UHF coupler is greatly improved.

Description

Built-in coupler for GIS partial discharge measurement

technical field

The utility model relates to a built-in coupler used for partial discharge measurement of GIS equipment based on UHF sensing.

Background technique

In terms of sensing methods for on-line partial discharge detection in GIS, the sensing methods that have been proven to be effective and feasible mainly include ultrasonic sensing and Ultra High Frequency (UHF) sensing. Ultrasonic sensing can achieve a certain sensitivity for defects close to the device casing, but for defects deep in the device, the attenuation in the signal propagation path is significant, and the detection sensitivity is limited. Ultra-high frequency sensing is to detect ultra-high frequency (UHF, 300MHz-3GMHz) electromagnetic wave signals generated by partial discharge. It has good sensing sensitivity, anti-interference ability and positioning accuracy. In order to detect tiny defects inside the device more sensitively, the built-in coupler needs to have higher sensitivity. At present, GIS manufacturers such as ABB, Siemens, and Toshiba can provide GIS equipment with internal UHF couplers.

At present, most of the built-in coupler structures used in GIS partial discharge measurement are shown in Figure 1. Two metal fixing bolts 1 are used to fix the sensing electrodes. The metal bolts are symmetrically embedded on the outer edge of the sensing electrode 2 and pass through the insulating pad 3. Fixed on the cover plate of the cylinder, because the thickness of the insulating pad is very thin, the cable joint 4 can pass through the cover plate 5 of the cylinder and the insulating pad to directly connect with the sensing electrode, and the bolt 1 and the sensing electrode 2 are insulated by the insulating piece 6, In this fixing method, the distance between the metal bolt 1 and the sensing electrode 2 is very close, which will cause part of the UHF signal to be short-circuited to the ground by the metal bolt, reducing the detection sensitivity of the UHF coupler.

Utility model content

The purpose of this utility model is to provide a built-in coupler structure for measuring GIS partial discharge, so as to solve the problem that the distance between the metal bolt and the sensing electrode of the existing built-in coupler structure is relatively close, causing part of the UHF signal to be short-circuited to the ground by the metal bolt, and reducing the UHF frequency. The detection sensitivity of the coupler is a problem.

In order to achieve the above purpose, the utility model adopts the following technical scheme: a built-in coupler for measuring GIS partial discharge, including an inductive electrode and an insulating plate for fixing between the cylinder cover plate and the inductive electrode, the insulating plate There is a connecting hole for directly fixing the insulating plate and the cylinder cover plate on the top, and the center of the induction electrode is provided with a mounting hole for fixing the induction electrode and the insulating plate together, and the center of the insulating plate is provided with an electrical connector , one end of the electrical connector is connected to the sensing electrode, and the other end is used to connect to the cable connector.

Fixing bolts for fixing the sensing electrode and the insulating plate are arranged in the mounting hole.

The diameter of the insulating plate is greater than the diameter of the sensing electrode, and the connection hole is arranged in the area where the insulating plate exceeds the sensing electrode. bolts.

The center of the insulating plate has a boss facing the direction of the sensing electrode, the electrical connector is arranged at the center of the boss, one end of the electrical connector is connected to the fixing bolt provided in the sensing electrode, and the other end is used to connect with the cable joint connect.

One end of the electrical connector has a mounting hole for plugging and mating with the cable connector, and the other end has a threaded hole for screwing with the induction electrode fixing bolt.

The center of the cylinder cover for fixed connection with the insulating cover has a bell mouth that prevents the electrical connector from being connected to the cylinder cover.

A cylindrical GIS hand hole is arranged at the lower end of the cylinder cover plate, and the GIS hand hole is fixed on the lower end surface of the cylinder cover plate through a flange.

The electrical connectors are copper pillars.

The insulating board is poured with epoxy resin.

The coupler includes a cable connector electrically connected to the sensing electrode.

The built-in coupler for measuring GIS partial discharge of the utility model separates and fixes the insulation plate and the induction electrode from the cover plate of the cylinder body, and sets connection holes on the insulation plate, directly fixes the insulation plate on the cover plate of the cylinder body, and fixes the induction electrode and the insulation plate , and is electrically connected with the cable joint, avoiding the contact between the metal and the sensing electrode when the metal bolt passes through the insulating pad and the sensing electrode at the same time in the prior art, solves the problem that the distance between the metal bolt and the sensing electrode is too close, and greatly improves Detection sensitivity of UHF couplers.

In order to make the structure more convenient and reasonable, the diameter of the insulating plate is larger than that of the sensing electrode. The connecting hole is set in the area where the insulating plate exceeds the sensing electrode. The connecting hole is a counterbore structure, and the connecting hole is used to fix the insulating plate. Bolts on the barrel cover.

In order to avoid electrical connection between the electrical connector and the cylinder cover, a bell mouth is provided at the center of the cylinder cover fixedly connected with the insulating cover to prevent the electrical connector from connecting with the cylinder cover.

Description of drawings

Figure 1 is a structural diagram of a common built-in coupler;

Fig. 2 is a structural schematic diagram of the built-in coupler of the present invention.

Detailed ways

The utility model is further introduced below in conjunction with specific embodiments.

As shown in Figure 2, it is a structural schematic diagram of the built-in coupler used for measuring GIS partial discharge of the utility model. As can be seen from the figure, the coupler includes an induction electrode 12 and an insulation for fixing between the cylinder cover plate 5 and the induction electrode 12. plate 13, the insulating plate 13 is provided with a connection hole 14 for directly fixing the insulating plate and the cylinder cover plate 5 together, and the center of the sensing electrode is provided with a mounting hole for fixing the sensing electrode 12 and the insulating plate 13 together, and in the mounting hole A fixing bolt 10 is provided to fix the sensing electrode and the insulating plate together. An electrical connector 6 is arranged in the center of the insulating plate. One end of the electrical connector is connected to the sensing electrode 12 and the other end is used to connect to the cable joint 4 .

For further optimization, in this embodiment, the diameter of the insulating plate 13 is greater than the diameter of the sensing electrode 12, and the connection hole is arranged in the area where the insulating plate exceeds the sensing electrode. Bolts 11 on the cylinder cover.

In order to further optimize and make the structure more simple and reasonable, a boss 8 facing the direction of the sensing electrode is arranged in the center of the insulating plate, and the electrical connector 6 is arranged at the center of the boss 8; one end of the electrical connector 6 has a The joint 4 is plugged into a mounting hole, and the other end has a threaded hole for threaded connection with the induction electrode fixing bolt 10 . The electrical connectors in this embodiment are made of copper pillars, and the insulating board is casted with epoxy resin.

In order to avoid electrical connection between the electrical connector and the cylinder cover, a bell mouth 15 is provided at the center of the cylinder cover fixedly connected with the insulating cover to prevent the electrical connector from connecting with the cylinder cover.

For the convenience of operation and use, a GIS hand hole 7 is provided at the lower end of the cylinder cover plate 5. The GIS hand hole is a cylindrical structure, welded on the flange 9, and the flange 9 is fixed on the lower end surface of the cylinder cover plate 5 superior.

In addition, the coupler of the present invention also includes a cable joint 4 electrically connected to the sensing electrode.

The fixing method of the insulating plate 13 and the cylinder cover plate 5 of the present utility model can also be provided with a through hole on the cylinder cover plate 5, the connecting hole on the insulating plate 5 is set as a blind hole, and a connecting piece (bolt can be used) ) through the through hole on the cylinder cover plate and connected with the blind hole on the insulation plate, so as to fix the insulation plate 13 and the cylinder cover plate 5 together.

The built-in coupler for measuring GIS partial discharge of the utility model separates and fixes the insulating plate and the induction electrode from the cover plate of the cylinder body. The insulating plate 13 is provided with connection holes, and the insulating plate 13 is directly fixed on the cover plate 5 of the cylinder body, and the induction electrode passes through The fixing bolt 10 is fixed to the insulating plate and is electrically connected to the cable joint 4. This structure achieves the purpose of the utility model and avoids the metal 1 and the metal 1 being fixed through the insulating pad 3 and the induction electrode 2 in the prior art. The contact of the sensing electrode 2, the sensing electrode is used to couple the UHF signal generated by the partial discharge, and the insulating plate is poured to prevent the sensing electrode from being directly grounded, which solves the problem that the distance between the metal bolt and the sensing electrode is too close, and greatly improves the detection sensitivity of the UHF coupler , for the insulation between the sensing electrode and the ground and the induction signal, epoxy resin is used to cast an insulating plate, and the center of the insulating plate is poured with a copper column with a suitable size as an electrical connector 6, which is used for partial discharge UHF The eliciting of the signal. Since the insulation board adopts epoxy resin pouring method, and the pouring material adopts epoxy resin and aluminum oxide filler, the pouring structure is reliable, the sealing performance and insulation performance are good, and it is easy to install after forming, and the insulation performance and air tightness are good. Meet product requirements.

Claims (10)

1. measure the built-in coupling mechanism that the GIS shelf depreciation is used for one kind; Comprise induction electrode and be used for fixing the insulcrete between cylindrical shell cover plate and induction electrode; It is characterized in that: said insulcrete is provided with and is used for connecting hole that insulcrete and cylindrical shell cover plate directly are fixed together; Said induction electrode center is provided with induction electrode and the insulcrete mounting hole that is fixed together; The center of said insulcrete is provided with electrical connector, and an end of said electrical connector is connected with induction electrode, and the other end is used for being connected with cable splice.

2. the built-in coupling mechanism that measurement according to claim 1 GIS shelf depreciation is used is characterized in that: be provided with the set bolt that induction electrode and insulcrete are fixed together in the said mounting hole.

3. the built-in coupling mechanism that measurement GIS shelf depreciation according to claim 2 is used; It is characterized in that: the diameter of said insulcrete is greater than the diameter of induction electrode; Said connecting hole is arranged at insulcrete and exceeds in the zone of induction electrode; Connecting hole is a counter bore structure, is provided with in the connecting hole to be used for insulcrete is fixed on the bolt on the cylindrical shell cover plate.

4. the built-in coupling mechanism that measurement GIS shelf depreciation according to claim 3 is used; It is characterized in that: said insulcrete center has the boss towards the induction electrode direction; Said electrical connector is arranged at the center of boss; Set set bolt is connected in one end of electrical connector and the induction electrode, and the other end is used for being connected with cable splice.

5. the built-in coupling mechanism that measurement GIS shelf depreciation according to claim 4 is used; It is characterized in that: an end of said electrical connector has and is used for the mounting hole of pegging graft and to cooperate with cable splice, and the other end has and is used for the threaded hole that is threaded with the induction electrode set bolt.

6. the built-in coupling mechanism that measurement according to claim 1 GIS shelf depreciation is used is characterized in that: the center of the said cylindrical shell cover plate that is used for being fixedly connected with insulation cover plate has the hydraucone that prevents that electrical connector is connected with the cylindrical shell cover plate.

7. the built-in coupling mechanism that measurement GIS shelf depreciation according to claim 1 is used, it is characterized in that: said cylindrical shell cover plate lower end is provided with the GIS hand hole of a cylinder-like structure, and said GIS hand hole is fixed on the cylindrical shell cover plate lower surface through flange.

8. the built-in coupling mechanism that measurement GIS shelf depreciation according to claim 1 is used, it is characterized in that: said electrical connector is the copper post.

9. the built-in coupling mechanism that measurement GIS shelf depreciation according to claim 1 is used, it is characterized in that: said insulcrete adopts poured with epoxy resin.

10. according to any built-in coupling mechanism that described measurement GIS shelf depreciation is used of claim 1～9, it is characterized in that: this coupling mechanism comprises the cable splice that is electrically connected with induction electrode.

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