Analytic method using laplace transform for a modified TRV of a circuit breaker

Author

Udagawa, K. ; Koshizuka, T. ; Kawano, H. ; Kosakada, M. ; Toyoda, M. ; Ikeda, H. ; Haginomori, E.

Author_Institution

Toshiba Corp., Japan

fYear

2010

fDate

19-22 April 2010

Firstpage

1

Lastpage

6

Abstract

When circuit parameters are known, it is easy to calculate the modified transient recovery voltage (TRV) with resister breaking or MOSA operating by numerical simulations. But, when the TRV is only known, it is very difficult to calculate the modified TRV by numerical simulations. This paper shows the theoretical analytic method of the modified TRV at such a circuit impedance modification as breaking with parallel resister or MOSA operating. A TRV can be calculated by injecting a current from circuit breaker terminals to back impedance. TRV and injected current wave shapes can be expressed with a group of ramp waveforms in Laplace domain. By using our analytic method, the back impedance can be easily derived in the Laplace domain from the TRV and injected current waveforms. As a result, it is shown that the modified TRV at circuit impedance modification can be calculated. Moreover, the same method can be used to calculate the TRV that is reduced by asymmetrical current breaking.

Keywords

Arresters; Circuit breakers; Circuit testing; Impedance; Laplace equations; Numerical simulation; Resistors; Surges; Transient analysis; Voltage; Laplace transform; Resister breaking; TRV;

fLanguage

English

Publisher

ieee

Conference_Titel

Transmission and Distribution Conference and Exposition, 2010 IEEE PES

Conference_Location

New Orleans, LA, USA

Print_ISBN

978-1-4244-6546-0

Type

conf

DOI

10.1109/TDC.2010.5484511

Filename

5484511