A measurement system for very fast transients in GIS power substations

Yan Wu,Hengtian Wu,Z Xu,Lingyun Gu,Chongqing Jiao,L Yang

doi:10.1051/e3sconf/202018501021

Abstract

In order to acquire the very fast transients during the disconnector operations in GIS (gas insulated switchgear, GIS) of power substation, a novel measurement system is developed and tested. By using the high speed digitizer as an alternative of the oscilloscope with other auxiliary device, the system is an effective approach to acquire the characteristics of the disturbance voltage of VFTs, including the frequency domain and the time domain features. Several kinds of experiments are carried out in the lab and GIS substation. The results show the good performance of this measurement system.

Highlights

The gas insulated switchgear (GIS) is widely used in power substations of many gird levels
A high speed digitizer is used to record and transmit the signals to computers for subsequent analysis. Performance tests to this measurement system includes high-voltage DC, square waves, surges and transient enclosure voltage(TEV) measuring, which validate the excellent competency of the system
This measurement system is applied in a 1000kV GIS substation and it completes the measuring task well

Summary

Introduction

The gas insulated switchgear (GIS) is widely used in power substations of many gird levels. Very fast transient overvoltages (VFTs), caused by discharge process during the disconnector (DS) operations of GIS, directly threaten the insulation of the GIS and even make the secondary power supply device fail[1,2,3]. A high speed digitizer is used to record and transmit the signals to computers for subsequent analysis. Performance tests to this measurement system includes high-voltage DC, square waves, surges and transient enclosure voltage(TEV) measuring, which validate the excellent competency of the system. This measurement system is applied in a 1000kV GIS substation and it completes the measuring task well

Designed specifications

Measurement theory

High-voltage DC

Square waves

Surge waves

Application

Findings

Conclusion