差压环流法测量主变差动保护相位现场分析

Scene analysis of measuring the phase of main transformer differential protection by differential voltage circulation method

对于工矿企业等用户变电所,主变投运时由于设备正处于安装或调试阶段,往往无法组织负荷,故传统方法无法对主变差动保护相位正确性进行检查。以许昌地区35 k V某用户变电所为实例,通过应用变压器环流法理论计算分析,在供电公司工程师的指导下,提出了用差压环流法测量主变差动保护相位从而对变压器保护电流互感器二次回路相位进行测量的方法,从而解决了变压器差动保护CT二次回路相位测量问题。对系统内两台变压器运行的变电所,亦可用此法进行变压器差动保护的电流相位测定。

For the substations of industrial and mining enterprises, when the equipment is in installation or debugging stage, it is often unable to organize load for the main transformer. So, traditional method can not be used to check the correctness of transformer differential protection phase. Taking a 35 kV substation in Xuchang city as an example, with the theoretical calculation and analysis, this paper proposes a method of measuring main transformer differential protection phase and the secondary circuit phase of transformer protection CT. As a result, this method solves the problem of phase measurement of protection CT secondary circuit of transformer differential protection. For the substation where two transformers are in operation, this method can also be used to measure the current phase of the differential protection of the transformer.