摘要
针对区外故障切除后造成差动保护误动很大程度由电流互感器(TA)饱和所致,分析了变压器和发电机差动保护误动的主要原因,提出了一种基于电子式电流互感器(ETA)的差动保护,信号传感器采用不饱和的空心线圈,前段采用悬浮式电源供电,以光纤作为信号传输媒介,保护原理采用成熟可靠的二段式折线比率保护加谐波闭锁。试验结果表明,该方法可防止TA饱和导致的误动,可大幅提高差动保护可靠性。
The saturation of magnetic current transformer can cause mal-operation of the differential current protection. This paper analyzed the main causes of transformer protection mal-operation, presented a protection device based on ETA. Air-core coil was used to acquire signal, which were transported to the protection device by optical-fiber, utilized two-step brokentine protection and harmonic wave deadlock to protection transformer. The result of static and dynamic testing proved that it has solved the mal-operation problem leaded by current transformer saturation and can be applied in electric device protection.
出处
《水电能源科学》
北大核心
2009年第4期202-205,共4页
Water Resources and Power
关键词
电子式电流互感器
差动保护
TA饱和
空心线圈
IEC61850
和应涌流
electronic-type current transformer
differential current protection
TA saturation
air-core coil
IEC61850
sympathetic inrush
