Operation Analysis of Over-Excitation Protection due to Voltage Transformer Inter-turn Short-Circuit at Generator Terminal

doi:10.11930/j.issn.1004-9649.201808041

Abstract

Abstract: A number of inter-turn short-circuit accidents have occurred in recent years in the primary winding of voltage transformer (TV) at generator terminal, which often causes slow fuse melting due to the large short-circuit current. In this paper, a calculation formula of TV secondary winding voltage is derived respectively for TV's primary winding inter-turn short-circuit and slow fuse melting, and it is concluded that the secondary winding voltage will decrease after a fault occurs. An analysis is made on the bugs in the TV disconnection logic in ABB Unitrol F excitation regulator, and a study is conducted on the mechanism of over-excitation protection and strong excitation of the excitation regulator caused by slow fuse melting. The theory is verified through a case study of an accident. Finally, the Matlab/Simulink simulation is used to verify the theory, and the simulation result proves the correctness of the theory.

Key words: voltage transformer, inter-turn short-circuit, slow fuse melting, TV disconnection, excitation regulator

CLC Number:

TM451
TM774

WANG Xing. Operation Analysis of Over-Excitation Protection due to Voltage Transformer Inter-turn Short-Circuit at Generator Terminal[J]. Electric Power, 2019, 52(9): 79-85.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.201808041

https://www.electricpower.com.cn/EN/Y2019/V52/I9/79

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