35kV大容量变压器继电保护整定及配合

Setting and coordination on relay protection for 35 kV large capacity transformer

35kV大容量变压器短路阻抗相对较小,造成35kV线路过流保护与35kV主变压器10kV侧后备保护无法配合,通过对实例变电站保护定值进行计算,对存在的问题进行分析,提出了采用35kV变压器10kV侧增加一段与10kV出线有灵敏度段进行配合的后备保护的方法,可解决保护不配合问题,提高供电可靠性。

The short-circuit impedance of the 35 kV large-capacity transformer is relatively small, which makes it hard to coordinate between the 35 kV line over-current protection and the backup protection on 10 kV side of 35 kV main transformer. This paper suggests to add backup protection section which coordinates 10 kV line sensitivity section protection on 10 kV side of 35 kV transformer through the setting calculation of the substation and analysis of existing problems. It resolves the problem that the protection doesn’t coordinate, and improves the reliability of power supply.