关于主变压器220kV侧断路器失灵保护的探讨

Discussing Failure Protection for the Main Transformer 220 kV Side Circuit Breaker

文章分析了220kV母线故障情况下断路器失灵的各种情况,以及主变压器220kV侧断路器失灵时保护动作行为,并结合实际工程,通过增加母线故障主变压器高压侧断路器失灵保护动作节点启动主变压器的非电量保护回路,经延时由主变压器非电量保护出口跳主变压器三侧断路器,实现快速切除故障,减少了对主变压器的损伤,降低了负荷损失。

Under the condition of 220 kV bus breakdown, the paper analyzes all of the possible circumstances of circuit breaker failure and the failure protection for the main transformer 220 kV side circuit breaker. Based on practical work, the paper holds that the employment of the failure protection, non-electricity protection and the method shifting from the main transformer non-electricity protection to the main transformer three-side circuit breaker can clear faults quickly, diminish the extent of damage to the transformer and decrease the loss of load.