DocumentCode :
1062825
Title :
Algorithm to identify the excitation inductance of power transformer with wye-delta connection
Author :
Jiale, Suonan ; Jiao, Z. ; Song, Gilyoung ; Kang, Xuejing
Author_Institution :
Sch. of Electr. Eng., Xi´an Jiaotong Univ., Xi´an
Volume :
3
Issue :
1
fYear :
2009
fDate :
1/1/2009 12:00:00 AM
Firstpage :
1
Lastpage :
7
Abstract :
An algorithm to identify the excitation inductances of three-phase power transformer with wye-delta connection is proposed. Existing methods of determining the excitation inductances of three-phase transformers require that all winding currents to be known, making them impractical on some wye-delta transformers where the delta winding currents are not measured. Based on the transformer equivalent circuit, the proposed algorithm eliminates the influence of the delta circulating current, allowing the excitation inductances to be calculated using the line currents of the delta connection side directly. The algorithm´s accuracy has been verified by electromagnetic transients program including direct current (EMTDC) simulations, which show that the proposed algorithm is able to differentiate accurately and sensitively between transformer inrush and fault conditions. This lends itself to applications in the area of transformer protection.
Keywords :
EMTP; equivalent circuits; power transformer protection; delta circulating current; delta winding currents; direct current simulations; electromagnetic transients program; excitation inductance; three-phase power transformer; transformer equivalent circuit; transformer protection; wye-delta connection;
fLanguage :
English
Journal_Title :
Electric Power Applications, IET
Publisher :
iet
ISSN :
1751-8660
Type :
jour
DOI :
10.1049/iet-epa:20080037
Filename :
4745913
Link To Document :
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