Title :
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
fDate :
November-December 2014
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;
Journal_Title :
Electrical Insulation Magazine, IEEE
DOI :
10.1109/MEI.2014.6943431
