电力系统自动化2017，Vol.41Issue(10)：92-99,147,9.DOI:10.7500/AEPS20160927006
整流变压器纵差保护二次侧电流最佳补偿方程及整定特征
Best Compensation Equation of Secondary Current and Setting Characteristcs of Longitudinal Differential Protection for Rectifier Transformer
姚晴林 1刘星 1姜睿智 1李国斌 1刘志远2
作者信息
- 1. 许继电气股份有限公司, 河南省许昌市 461000
- 2. 国网宁夏电力公司, 宁夏回族自治区银川市 750001
- 折叠
摘要
Abstract
To compensate for the current inadequacy of large capacity rectifier transformers with only overurrent protection but no longitudinal differential protection at home and abroad, the key contents of setting up longitudinal differential protection for rectifier transformer are proposed.First, the special treatment methods for the sampled secondary current values of current transformer on the valve side of the longitudinal differential protection are put forward and demonstrated.And it is also shown what value of effective three-phase current values on the grid and valve sides in the calculation of differential current and brake current for longitudinal differential protection should be adopted, i.e., the best compensation (or angle) equation is demonstrated, which is different from the compensation equation of the conventional power transformer, converter transformer, electric furnace transformer, etc.A unique calculating method of phase and modulus value of grid-side current is proposed and demonstrated when a two-phase short circuit fault occurs on the valve side of the rectifier transformer.The action characteristics of differential protection for rectifier transformer are analyzed when a two-phase short circuit fault or a single-phase grounding fault occurs.The characteristics of setting calculation of differential protection can make the protection action sensitivity significantly increase during the internal short-circuit fault, and make the differential protection range significantly expand, while protecting the valve-side short-circuit of the rectifier bridge and the DC side short-circuit.关键词
整流变压器/变压器保护/纵差保护/最佳补偿方程/短路分析/整定计算Key words
rectifier transformer/protection of transformer/longitudinal differential protection/best phase compensation/short-circuit analysis/setting calculation引用本文复制引用
姚晴林,刘星,姜睿智,李国斌,刘志远..整流变压器纵差保护二次侧电流最佳补偿方程及整定特征[J].电力系统自动化,2017,41(10):92-99,147,9.
