电测与仪表Issue(23)：123-128,6.
变压器差动保护二次谐波制动方案分析与改进
Analysis and Improvement of Secondary Harmonic Restraint Strategy for Transformer Differential Protection
张双梓 1王铮 1孙世勇 2邓锐1
作者信息
- 1. 国网河南省电力公司检修公司，郑州450000
- 2. 国网河南平顶山供电公司，河南平顶山467000
- 折叠
摘要
Abstract
If the TA is saturated, low second harmonics in transformer differential current will cause false action for differential protection, when the traditional second harmonic restraint strategy is adopted for transformer differential protection in transformer load switching, internal or external fault removal.The harmonic analysis is carried out for the differential current in this paper.Aiming at the problems in traditional second harmonic restraint, a new second har-monic restraint strategy is proposed based on the amplitude and phase of the second harmonic comprehensive criterion. The phase relationship between the fundamental and the second harmonic in inrush current has been researched.The integrated brake criterion is constituted by the second harmonic restraint coefficient adaptively with the second harmon-ics.EMTP simulation results verify the correctness and reliability of the proposed scheme.关键词
励磁涌流/二次谐波/综合制动方案/相位关系Key words
inrush current/second harmonic/integrated brake program/phase relationship分类
信息技术与安全科学引用本文复制引用
张双梓,王铮,孙世勇,邓锐..变压器差动保护二次谐波制动方案分析与改进[J].电测与仪表,2014,(23):123-128,6.
