南方电网技术2018，Vol.12Issue(10)：35-40,6.DOI:10.13648/j.cnki.issn1674-0629.2018.10.006
变压器零序差动保护的分析和改进
Analysis and Improvement of Zero Sequence Differential Protection for Transformer
陆明 1薛磊 2余江 1兀鹏越 2郭霞2
作者信息
- 1. 中国南方电网电力调度控制中心,广州 510663
- 2. 西安热工研究院有限公司,西安 710054
- 折叠
摘要
Abstract
Because of insufficient sensitivity of the transformer differential protection in protecting the single-phase ground fault, the necessity of the zero-sequence differential protection of the transformer is discussed. However, due to human factors, such as zero-sequence current transformer wiring error, protection setting error, zero-sequence current transformer selecting error, and so on, zero-sequence differential protection incorrect action accidents often occur. These errors of zero-sequence differential protection cannot be verified by the normal load current, which limit the application of zero-sequence differential protection. In this paper, the zero-sequence differential protection is configured with self-checking function, which uses the magnetizing inrush current to verify the correctness of zero-sequence protection circuit, and is proved to be correct by dynamic simulation and experiment test. The self-checking function does not require manual participation, is reliable and practical, and can effectively prevent incorrect action of zero sequence protection caused by human error.关键词
变压器/零序差动保护/自校验技术Key words
transformer/zero sequence differential protection/self checking technology分类
信息技术与安全科学引用本文复制引用
陆明,薛磊,余江,兀鹏越,郭霞..变压器零序差动保护的分析和改进[J].南方电网技术,2018,12(10):35-40,6.
