零序电流对数字变压器差动保护Y,d矢量变换的影响及对策

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数字式变压器差动保护在星形侧发生外部单相接地或线路单相遭雷击的情况下,差动保护有时会误动.文中在深入分析矢量变换对差动电流影响的基础上,分析了变压器差动保护误动的原因,并提出基于零序电流补偿的三角形(△)侧向星形(Y)侧矢量变换的方法.该方法通过中性点零序电流和Y侧三相相电流的计算零序电流进行相位比较来决定是否消除Y侧的零序电流.最后通过实例证明了该方法的正确性.
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