Estimation of fast transient overvoltage in gas-insulated substation

Author

Yanabu, S. ; Murase, H. ; Aoyagi, H. ; Okubo, H. ; Kawaguchi, Y.

Author_Institution

Toshiba Corp., Kawasaki, Japan

Volume

5

Issue

4

fYear

1990

fDate

10/1/1990 12:00:00 AM

Firstpage

1875

Lastpage

1882

Abstract

The authors measured FTO (fast transient overvoltages) at various points of a commercial 550 kV gas-insulated substation (GIS) by operating energized disconnectors. Based on the results of these measurements, the possible levels of FTO at various points of the GIS and the probability of occurrence of large levels are discussed. Laboratory tests were also performed by using a recently developed 1 GHz surge sensor to check on the insignificance of high-frequency components due to short-surge impedance discontinuities such as spacers, disconnectors, and short bus branches. Waveforms calculated by rough simulation that ignored the short surge impedance discontinuities are compared with measured waveforms at the commercial substation, proving that simulated FTO levels agreed well with measured values

Keywords

gaseous insulation; overvoltage; substations; transients; 1 GHz; 550 kV; disconnectors; fast transient overvoltage; gas-insulated substation; short bus branches; short-surge impedance discontinuities; spacers; surge sensor; Bars; Circuit simulation; EMTP; Gas insulation; Geographic Information Systems; Impedance; Substations; Surges; Switchgear; Voltage control;

fLanguage

English

Journal_Title

Power Delivery, IEEE Transactions on

Publisher

ieee

ISSN

0885-8977

Type

jour

DOI

10.1109/61.103684

Filename

103684