Features and mechanism of interturn short circuit fault by energizing noload transformer

Abstract

Abstract:

When interturn short circuit fault by energizing noload transformer occurs, the threephase current differential protection is blocked by blocking criteria, and it causes the singlephase interturn short circuit fault could not be rapidly removed, which threats the safe operation of transformer. Through establishing the equivalent model of interturn short circuit fault, this paper deduced the analytical expression of magnetic flux of exciting windings and analyzed the influences of system impedance and number of faulted turns on fault features. It concluded that the larger system impedance and number of faulted turns, the more difficult the inrush current occurs. Using the PSCAD software, the correctness of the conclusion was verified, and it provided a theoretical basis for the selection of blocking criteria and blocking schemes of differential protection.

Key words:

">">interturn short circuit；inrush current；system impedance；PSCAD software

GUO Xiao, XING Wu, HU Bing, WANG Zhe.

Features and mechanism of interturn short circuit fault by energizing noload transformer

[J]. Huadian Technology, 2017, 39(4): 4-7.

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Features and mechanism of interturn short circuit fault by energizing noload transformer

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