一起撬装变高压侧反相序变压器差动保护分析

Analysis on Differential Protection of High Voltage Side Reverse Phase Sequence Transformer of Skid Mounted Substation

针对某站所Yd11型变压器高压侧反相序引起的差动保护校核困难问题,从变压器绕组联接组别、高低压侧电流大小及相位平衡补偿原理出发,对变压器差动保护接线方式进行整定分析,提出基于不同二次接线的两种整定结果。实际应用证明,这两种整定结果均能保证变压器差动保护正确动作。

To the difficulty in checking the differential protection caused by the reverse phase sequence at the high voltage side of the Yd11 transformer in a substation,the connection mode of the differential protection of the transformer based on the connection group of the transformer winding,the current size at the high and low voltage sides and the compensation principle of the phase balance were analyzed,and two setting results based on different secondary connections were put forward.Practical application proves that these two setting results can ensure the correct operation of the transformer differential protection.