Analysis of very fast transient overvoltage in transformer winding

Author

Shibuya, Y. ; Fujita, S. ; Hosokawa, N.

Author_Institution

Electro-mech. Syst. Dept., Mitsubishi Electr. Corp., Japan

Volume

144

Issue

5

fYear

1997

fDate

9/1/1997 12:00:00 AM

Firstpage

461

Lastpage

468

Abstract

Owing to the operation of disconnector switches, very fast transient overvoltages can generate a voltage oscillation inside power transformers connected to them. A practical method to analyse such oscillations is developed based on multiconductor transmission-line theory. The analysis is conducted in two steps in the frequency domain: first the whole transformer winding is simulated using a single transmission-line model; and secondly, the phenomena in the first coil are analysed using a multiconductor transmission-line model. The numerical results for an actual 525 kV power transformer conform with experiments. The interturn voltage shows a resonance determined by the travelling waves in the coil. The propagation of travelling waves is visualised using time domain analysis

Keywords

frequency-domain analysis; overvoltage; power transformers; time-domain analysis; transformer windings; transients; 525 kV; frequency domain; interturn voltage; multiconductor transmission-line theory; power transformer windings; resonance; time domain; travelling waves propagation; very fast transient overvoltage; voltage oscillation;

fLanguage

English

Journal_Title

Generation, Transmission and Distribution, IEE Proceedings-

Publisher

iet

ISSN

1350-2360

Type

jour

DOI

10.1049/ip-gtd:19971134

Filename

629505