Study on Transient Characteristics of VFTC in 1 100 kV GIS Substation

doi:10.11930/j.issn.1004-9649.2016.07.001.08

Abstract

Abstract: The very fast transient current(VFTC) occurring in GIS is mainly caused by SF₆ gas discharge due to disconnector operation. This phenomena will not only destroy the insulation of GIS equipment, but also cause a series of electromagnetic interference problems on the secondary equipment. However, current research mostly focuses on very fast transient overvoltage(VFTO) and ignores the effect of VFTC. Transient characteristics of VFTC in UHV(Ultra High Voltage) level are studied. A segment model is adopted in high frequency discharge model of SF₆ based on impedance change in different discharging stages. This new model is applied to simulate VFTC during disconnector operation in a UHV GIS substation. For better understanding the transient characteristics of VFTC, decay time is defined to describe VFTC transient characteristics. Restrain effect of damping resistor on VFTC is also discussed. From research results, VFTC under UHV level has characteristics of high amplitude(up to several thousand amperes), high frequency, broad dominant frequency distribution (0~25 MHz) and long decay time(100 microseconds). The damping resistor can greatly improve VFTC decaying rate, but has small influence on distribution of dominant frequency.

Key words: GIS, disconnector, VFTC, SF₆ gas discharge

CLC Number:

TM89

WEI Meifang, WU Xixiu, YU Guangzhao, TIAN Yun, WU Shipu. Study on Transient Characteristics of VFTC in 1 100 kV GIS Substation[J]. Electric Power, 2016, 49(7): 1-8.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.2016.07.001.08

https://www.electricpower.com.cn/EN/Y2016/V49/I7/1

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