Influence of switching properties of the disconnector on very fast transient overvoltage

During switching operations of disconnectors in gas insulated switchgear (GIS), very fast transient overvoltage (VFTO) is generated due to multiple strikes across the switching contact. Switching properties, such as switching speed and trapped charge, have some impacts on VFTO behavior. In this pape...

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Bibliographic Details
Published in2017 IEEE Electrical Insulation Conference (EIC) pp. 412 - 416
Main Authors Huamao Zhan, Shaofeng Duan, Linzhi Yao, Lin Zhao
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.06.2017
Subjects
Breakdown voltage
Disconnector
Electric breakdown
gas insulated switchgear
Gas insulation
Load modeling
Switches
Transient analysis
trapped charge
very fast transient overvoltage
Voltage measurement
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Summary:During switching operations of disconnectors in gas insulated switchgear (GIS), very fast transient overvoltage (VFTO) is generated due to multiple strikes across the switching contact. Switching properties, such as switching speed and trapped charge, have some impacts on VFTO behavior. In this paper, the VFTO caused by switching operations of a disconnector in a 252kV GIS was measured and analyzed with different switching speed. A position sensitive detector was employed for measuring the gap length simultaneously so as to get the variation of breakdown voltage with the gap length. Experimental results show that the highest VFTO magnitude was generated when the closing speed was 0.7m/s. Results also indicate the polarity effect of the breakdown voltage and the effect of the trapped charge. A simulation method for the VFTO associated with the whole switching operation of was proposed, in which these switching properties were taken into consideration.
ISBN:1509039651
9781509039654
DOI:10.1109/EIC.2017.8004674