摘要
在简述传统二次谐波制动原理和存在问题的基础上,分析了空投于无故障变压器和有故障变压器时差动电流基波含量和二次谐波含量的变化特性。利用该特性提出一种自适应的励磁涌流制动方法。通过该方法实时判断变压器的运行状态,确定可靠闭锁或及时开放差动,解决现有方法在励磁涌流制动和差动保护正确快速动作之间的矛盾,提高了励磁涌流制动的灵敏性,确保变压器在仅有励磁涌流的情况下可靠制动,在任何有区内故障的情况下又能正确快速动作。
Following the discussion of traditional 2nd order harmonics restraint principle and its deficiency,the paper analyzes variation characteristics of the fundamental component and 2nd order harmonics component of differential current when a normal transformer is energized and when a faulty transformer is energized.Based on the characteristics,a new adaptive inrush current restraint principle is proposed.The method judges the real-time operation state of a transformer and ensures secure blocking and dependable activation of differential protection operation.The method solves the conflict of inrush restraint and correct and fast protection operation,and improves restraint sensitivity,which ensures that the restraint takes effect only when inrush current occurs and the correct and fast protection operates when any internal fault happens.
出处
《电力系统自动化》
EI
CSCD
北大核心
2010年第2期80-83,共4页
Automation of Electric Power Systems
关键词
差动保护
励磁涌流
二次谐波
自适应
differential protection
magnetizing inrush current
the 2nd order harmonics
adaptive
