论损耗比对判断变压器局部缺陷的有效性

Effectiveness of loss ratio for judgement of local defects in transformers

通过公式推导和理论分析,对心式三相三柱变压器的单相空载损耗比和电流比进行了研究论证。并结合实际测量数据,详细分析了单相空载损耗比对发现变压器线圈和铁心局部缺陷的准确性和有效性。指出,损耗比能准确地发现变压器的局部缺陷,而电流比却不能作为判断变压器局部缺陷的依据。

The single-phase idle loss ratio and current ratio of a heartlike 3-phase 3-column transformer are studied through formula derivation and theoretical analysys.Each and every idle loss ratio has been checked against actual measurement for accuracy and effectiveness in identifying local defects in windings and cores of transformers.It is concluded that loss ratios can beused to accurately identify local defects in transformers,but current ratio can not be used as the basis for identification of local defects in transformers.