Abstract
With the increase of electric network voltage in power system, the internal discharge phenomenon of gas insulated substation (GIS) during operation often happens. In this paper, a 3-D simulation model of GIS with metal protrusion on basin-type insulator was utilized to study the effect of metal protrusion on the electric field distortion in GIS. It can be concluded from simulation results that the electric field increases with the height of metal protrusion when the radius is constant, while decrease with the increase of radius of metal protrusion. In addition, the metal protrusion near high voltage conductor lead to more severe electric field distortion than that near grounded enclosure. This work is of significance for the actual operation and maintenance of GISs in the power system.
Highlights
Gas insulated substation (GIS) has been rapidly developed in the power system, due to the advantages of high reliability, fast installation and convenient operation[1]
Through the analysis of calculated results, we found that the electric field increases with the height of metal protrusion when the radius is constant
The 3-D simulation model of GIS with basin-type insulator was utilized to study the effect of metal protrusion on the electric field distortion in GIS
Summary
Gas insulated substation (GIS) has been rapidly developed in the power system, due to the advantages of high reliability, fast installation and convenient operation[1]. Some metal protrusion will be produced inevitably in the cavity of GIS during the GIS installation and operation. These metal protrusion and suspended particles can cause distortion of the electric field and excessive local electric field inside GIS, which lead to the corona discharge and breakdown[2]. With the increase of electric voltage and capacity in power system, even small defects can lead to internal failures in compact GIS equipment. It is important to analyse the electric field distribution when the metal protrusion exist in GIS, which is helpful to reduce the failure rate of GIS and ensure the reliable operation of the power system
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