3-MV compact very fast transient overvoltage generator for testing ultra-high-voltage gas-insulated switchgear

Author

Tao Wen ; Qiaogen Zhang ; Can Guo ; Xuandong Liu ; Lei Pang ; Junping Zhao ; Yu Yin ; Weidong Shi ; Weijiang Chen ; Xiangyu Tan

Author_Institution

State Key Lab. of Electr. Insulation & Power Equip., Xi´an Jiaotong Univ., Xi´an, China

Volume

30

Issue

6

fYear

2014

fDate

November-December 2014

Firstpage

26

Lastpage

33

Abstract

Gas-insulated switchgear (GIS) is widely used today in electrical power systems because of its reliability, compaction, long maintenance cycle, and small impact on the environment [1]. In its use the normal operation of the disconnector generates very fast transient overvoltages (VFTO) with frequencies ranging from 1 to 100 MHz [2] and amplitudes up to 2.5 p.u. [3]. For systems above 330 kV, the insulation strength of the GIS under VFTO is of concern as insulation failures caused by VFTO have exceeded those caused by lightning impulse (LI) [4]. This characteristic has attracted the attention of researchers worldwide and currently is a hot topic in the field of ultra-high-voltage (UHV) GIS insulation.

Keywords

electric generators; gas insulated switchgear; lightning protection; overvoltage protection; GIS; LI; UHV; VFTO; compact very fast transient overvoltage generator; electrical power systems; frequency 1 MHz to 100 MHz; insulation failures; insulation strength; lightning impulse; ultra-high-voltage gas-insulated switchgear testing; voltage 3 MV; voltage 330 kV; Capacitance; Gas insulation; Generators; High-voltage techniques; Insulators; Power distribution; Switches; Voltage measurement; disconnector operation; gas-insulated switchgear; insulation characteristics; lightning impulse; very fast transient overvoltage;

fLanguage

English

Journal_Title

Electrical Insulation Magazine, IEEE

Publisher

ieee

ISSN

0883-7554

Type

jour

DOI

10.1109/MEI.2014.6943431

Filename

6943431