摘要
主变压器6～35kV采用中性点不接地或经消弧线圈或电阻器接地方式，当发生单相接地故障，电容电流过大，超过允许值时，接地电弧不易自熄，会在故障相产生间歇性弧光，对健全相产生很高的过电压，即弧光过电压，如何限制弧光过电压，对几种方法进行了比较，分析了各自的优缺点，并结合兰州石化公司的实际情况，确定主变压器35kV和6kV中性点接地方式采用配置自动跟踪补偿装置的消弧线圈成套设备。
The main transformer 6-35 kV normally uses a non-grounding neutral method or a grounding through an arc suppressing coil or a resistor. When a single-phase grounding error occurs, the capacitor current surges and exceeds the permitted value, making the grounding arc fail to extinguish spontaneously, generating intermittent are in the failed phase and producing a high over-voltage - arc over-voltage on the good phase. This paper compares and analyzes several are over-voltage limiting methods, and based on the actual case of China Petro Lanzhou Branch, it is concluded that the neutral point grounding for the main transformer 6-35 kV should use the arc suppressing coil apparatus with automatic training compensation.
出处
《电网与清洁能源》
2011年第5期55-57,共3页
Power System and Clean Energy
关键词
35
kV和6kV中性点
弧光接地过电压
消弧线圈
自动跟踪补偿装置
neutral point for 6-35 kV
arc over-voltage by grounding
arc suppressing coil
apparatus with automatic training compensation
