GIS full-closed basin-type insulator with built-in ultra-high frequency sensor

Abstract

The invention relates to a GIS full-closed basin-type insulator with a built-in ultra-high frequency sensor. The existing product has many shortcomings. The insulator provided by the invention comprises a full-closed insulating basin body made of an insulating material. The outer surface of the body is covered with an antenna layer made of a metal material along the wall. A metal shielding layer is arranged outside the antenna layer. The antenna layer is insulated from the metal shielding layer through an insulating layer. The metal shielding layer is provided with a pouring hole. A signal conditioning circuit board is arranged in the pouring hole, and the hole is closed by a metal cover plate. A signal output connector is arranged through the metal cover plate. An inner needle is arrangedinside, and a grounding protection cover is arranged on the signal output connector. One end of a feeder is connected with the antenna layer, and the other end is connected with the input end of thesignal conditioning circuit board. One end of a radio frequency cable is connected with the output end of the signal conditioning circuit board, and the other end is connected with the inner needle. According to the invention, the antenna is built into the insulating basin; the detection effect of the built-in sensor is realized without changing the electrical safety distance and the insulation performance of the GIS; and the GIS full-closed basin-type insulator has the advantages of excellent shielding performance, good anti-interference performance, high detection efficiency and convenient maintenance.

Description

Technical field [0001] The invention belongs to the technical field of high voltage detection, and specifically relates to a GIS (Gas Insulated Switchgear, gas insulated switchgear) fully enclosed basin insulator with a built-in UHF sensor. Background technique [0002] GIS basin insulator is an insulating support used to connect the two air chambers of GIS. At present, there are three main types: basin insulators without shielding layer, fully enclosed basin insulators with shielding layer, basin insulators with pouring hole shielding layer. The UHF partial discharge detection method is a key technical means for GIS insulation state detection. This method mainly uses external UHF sensors or built-in UHF sensors to collect UHF PD signals. External UHF sensors are mainly used for basin insulators without shielding layer and basin insulators with pouring hole shielding layer; built-in UHF sensors are mainly used for fully enclosed basin insulators with shielding layer. [0003] The...

AI Technical Summary

Problems solved by technology

[0003] The GIS equipment manufacturer needs to reserve a fixed installation port on the tank body for the signal acquisition of the built-in UHF sensor. This structure has many disadvantages: first, it is difficult to ensure the safety distance of the GIS insulation, and it is easy to cause insulation defects such as floating potential; Change the monitoring position, and the detection efficiency is low; the third is to directly affect the airtightness and integrity of the tank body and increase the workload of opening holes

[0004] Although there is no need to reserve an installation port for signal collection by an external UHF sensor, when the pouring hole is used for detection, the sensor is placed outside the pouring hole of the basin-type insulator with the shielding layer of the pouring hole, which has a large internal signal attenuation and is susceptible to Disadvantages such as external interference; for pot insulators without shielding layer, although the detection signal is good, there are disadvantages such as the GIS itself has large electromagnetic radiation and the detection signal is susceptible to external interference.

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