摘要
分析了变压器差动保护中的励磁涌流二次谐波成分,认为对称性涌流中的二次谐波分量对于闭锁谐波制动差动保护是足够的,提出借助直流分量加强二次谐波作用的新判据。提出的另一判据是用定增斜率制动特性取代原用的双斜率制动特性。分析计算、试验和试运行经验证明了所提出的新判据正确、可行。
The second harmonic component of magnetic inrush currents in transformer differential protection is analyzed. The analytical result shows that the second harmonic component of symmetric inrush current is big enough for blocking the differential protection. Hence a new criterion is proposed to intensify the second harmonic with the contribution of DC component. A second new criterion proposed is a constant-increase-of-slop restraint characteristic which replaces the old dualslop percentage restraint characteristic. Analysis, tests and operation experiences prove the validity and feasibility of the proposed criteria.
出处
《电力系统自动化》
EI
CSCD
北大核心
2006年第14期50-53,86,共5页
Automation of Electric Power Systems
关键词
变压器差动保护
二次谐波
直流分量
励磁涌流
定增斜率
transformers differential protection
second harmonic
DC component
magnetic inrush current
constant-increase-of-slop
