摘要
分析了和应涌流产生的物理机理及其对差动保护的影响。理论和实际分析结果表明,由于 相邻变压器空投涌流中的非周期分量流过系统电阻,导致公共节点上电压的非周期波动,引起该变 压器产生和应涌流,且和应涌流中衰减较慢的非周期分量所引起的电流互感器局部暂态饱和是导 致差动保护误动的主要原因,最后提出了在运行中应该注意的问题和方法。
The physical mechanism of the sympathetic interaction between two transformers caused by inrush transients and its influence on differential protection are analyzed. Theory analysis and practical cases show that the non-periodic component of inrush current caused by the energized transformer running across the system resistance results in the non-periodic fluctuation of voltage in the common node, which accounts for the sympathetic inrush on the adjacent transformer. And the partial transient saturation of the current transformer due to the slowly attenuated non-periodic component of the sympathetic inrush is the main reason for mal-operation of differential protection. Several points for attention and the relevant methods for the operation are presented.
出处
《电力系统自动化》
EI
CSCD
北大核心
2005年第6期9-14,共6页
Automation of Electric Power Systems
基金
江苏省博士后科研基金资助项目江苏省电力公司重点科技项目(J2003038)~~
关键词
变压器
和应涌流
差动保护
电流互感器局部暂态饱和
Electric equipment protection
Electric fault currents
Electric resistance
Voltage control
