110kV大容量变压器继电保护配合的整定计算

110 kV大容量变压器短路阻抗相对较小,而造成110 kV线路距离保护与220 kV主变压器110 kV侧后备保护难以实现配合,通过整定值的计算以及保护范围的复核,提出采用增加主变压器后备保护段数的方法予以解决.

Setting Calculation On Relay Protection Coordination For The Larege Capacity 110 kV Transformer

Based on the fact that the short-circuit impedance of the large capacity 110 kV transformer is relative small,making it hard to coordinate between the 110 kV power line distance protection and the backup protec- tion on 110 kV side of 220 kV main transformer,in this paper we suggest to add the backup protection section of the main transformer to solve the problem through the setting calculation and checking on the protection ranges.