Automatic Detection Method of TA Polarity of Zero Sequence Differential Protection for Generator Transformer Unit

doi:10.3969/j.issn.1008-0198.2022.03.011

Hunan Electric Power ›› 2022, Vol. 42 ›› Issue (3): 59-64.doi: 10.3969/j.issn.1008-0198.2022.03.011

• New technology and Application • Previous Articles Next Articles

Automatic Detection Method of TA Polarity of Zero Sequence Differential Protection for Generator Transformer Unit

DING Xin¹, XU Tianle², JIANG Weimin¹, MO Fei³

1. CHN Energy Jianbi Power Plant, Zhenjiang 201006, China;
2. Nanjing NR Electric Co., Ltd., Nanjing 211102, China;
3. Jiangsu Frontier Electrical Power Technology Co., Ltd., Nanjing 211102, China

Received:2022-02-16 Revised:2022-03-28 Online:2022-06-25 Published:2025-08-05

Abstract

Abstract: This paper introduces the principle of zero sequence differential protection, aiming at the problem of polarity verification of step-up transformer zero sequence differential protection current transformer (TA), uses the unbalanced current generated by magnetizing inrush current when the transformer is charged, extracts the characteristic quantity of self-produced zero sequence current and neutral point zero sequence current, proposes automatic detection method of TA polarity for zero sequence differential protection of generator transformer unit, and carries out dynamic simulation experiment and the field waveform playback test. The experimental results show that this method can automatically and accurately identify the polarity of neutral point zero sequence current transformer when the no-load step-up transformer is charged, greatly simplify the zero difference polarity verification process, which provides technical support for the wide application of zero sequence differential protection of generator transformer unit.

Key words: zero sequence differential protection, polarity check, no-load transformer charging, automatic recognition

CLC Number:

TM773.4

DING Xin, XU Tianle, JIANG Weimin, MO Fei. Automatic Detection Method of TA Polarity of Zero Sequence Differential Protection for Generator Transformer Unit[J]. Hunan Electric Power, 2022, 42(3): 59-64.

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Automatic Detection Method of TA Polarity of Zero Sequence Differential Protection for Generator Transformer Unit

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