Gas Insulated Switchgear（GIS）Introduction

GIS is the English abbreviation of Gas Insulated Switchgear, generally translated as gas insulated fully enclosed combined electrical appliances, usually using SF6 gas as the insulating medium, including circuit breaker (CB), disconnector (DS), earthing switch (ES, FES), busbar ( BUS), current transformer (CT), voltage transformer (VT), lightning arrester (LA) and other high voltage components. At present, GIS equipment products have covered the voltage level range of 72.5 kV ~ 1200 kV.

Features of GIS equipment

Because SF6 gas has excellent insulation performance, arc extinguishing performance and stability, GIS equipment has the advantages of small footprint, strong arc extinguishing ability, and high reliability, but the insulation ability of SF6 gas is greatly affected by the uniformity of the electric field. When GIS Insulation abnormalities are prone to occur when there are sharp points or foreign objects inside.

GIS equipment adopts a fully enclosed structure, which not only brings the advantages of internal components without environmental interference, long maintenance cycle, less maintenance workload, and low electromagnetic interference, but also has problems such as complicated single maintenance work and relatively poor detection methods. And when the closed structure is eroded and damaged by the external environment, it will further bring about a series of problems such as water ingress and air leakage.

Internal structure of GIS equipment

The GIS conductive loop is composed of several components. According to the working method, it can generally be divided into: fixed contact (electrical contact fastened with fasteners such as screws is called fixed contact, and fixed contact has no relative movement during the working process. Such as the connection between the contact and the basin, etc.), contact Contact (electrical contact that can be separated during work is also called separable contact), sliding and rolling contact (during working, the contacts can slide or roll each other, but electrical contact that cannot be separated is called sliding and rolling contact. The middle contact of the switching device is to use this kind of electrical contact).

Inside switchgear power cabinet,we need install epoxy resin products,such as epoxy resin insulation components ,like wall bushing,epoxy resin plate,spout,etc.these electrical components always cast by APG machine.adopt apg technique to make sure high quality.

Post time:
Jun-28-2023