摘要
单元件横差保护是发电机的一种简单、灵敏的主保护。大型发电机内部故障产生的巨大短路电流可能引起其电流互感器饱和 ,从而影响保护的动作性能。文中采用ATP仿真程序对电流互感器的饱和问题进行了研究 ,分析了不同条件下电流互感器饱和的行为特征及对单元件横差保护的影响 ,并提出了相应的措施。在此基础上 ,提出一种基于小波滤波器的发电机单元件横差保护方案 ,仿真及动模实验数据均表明新方案在各种情况下表现出较好的性能 。
The unit-transverse differential protection is usually the first generator protection scheme. But for large generator, the fault current can be greater, which affects greatly the protection performance by making the current transformer saturation. This paper analyzes this particular problem with ATP and presents some countermeasures. A new unit-transverse differential protection based on the wavelet transform is then introduced. Both the simulation and experimental results show that new scheme can obtain high performance at different conditions, including the case that the current transformer is saturated.
出处
《电力系统自动化》
EI
CSCD
北大核心
2003年第20期49-53,91,共6页
Automation of Electric Power Systems
基金
国家自然科学基金资助项目 ( 5 0 10 70 0 7)~~
关键词
电流互感器
小波变换
饱和
单元件横差保护
发电机
Computer simulation
Digital filters
Electric generators
Electric power system protection
Electric transformers
Harmonic analysis
Transients
Wavelet transforms
