摘要
针对某330kV启备变压器空载充电时发生继电保护动作的问题,通过分析电量分析仪记录的充电电流波形,指出该继电保护动作是由A相电流互感器接地故障引起,并给出了提高大型变压器充电试验安全可靠性的几点建议:加强对变压器高压侧电流、电压互感器的绝缘检查;适当提高变压器主、后备保护的灵敏度,防止励磁涌流造成继电保护动作;充电过程中应对变压器高压侧三相电压、电流进行录波。
In view of problem that a 330 kV start-up standby transformer took place relay protection action in no-load charging, the paper indicated that the action was caused by grounding fault of A-phase current transformer through analyzing charging current waveform recorded by electric quantity analyzer, and gave several suggestions to improve safety and reliability of charging test of large-scale transformer: strengthen insulation inspection for current and voltage transformers of high-voltage side of transformer; properly increase sensitivity of main and backup protection to prevent relay protection action by inrush current; it should record for three-phase current and voltage of high-voltage side of transformer in charging process.
出处
《工矿自动化》
北大核心
2013年第5期63-66,共4页
Journal Of Mine Automation
关键词
启备变压器
空载充电
电流互感器
继电保护
保护动作
start-up standby transformer
no-load charging
current transformer
relay protection
protection action