Abstract：In order to preferably evaluate the differential protection of autotransformer whether it meets the sensitive and reliable requirements about the high voltage and medium voltage Yn sides grounding short-circuit and configures the main protection correctly. This paper calculates the short-circuit of the high voltage and medium voltage Yn sides by transition resistance and verifies the sensitivity factor of differential protection grounding fault by the actual calculation results of autotransformer differential protection. The calculation results show the differential protection can not meet the requirements when the high voltage and medium voltage sides of autotransformer ground by transition resistance, so it is necessary to add zero-sequence or separation side differential protection for meeting the requirements of the earth-fault sensitivity in the different operation modes.
席亚克, 刘桂莲, 刘永欣, 牛强, 陶永健. 自耦变压器主保护配置方案研究[J]. 电气技术, 2015, 16(06): 84-88.
Xi Yake, Liu Guilian, Liu Yongxin, Niu Qiang, Tao Yongjian. Study about the Configuration Schemes for Main Protection of Autotransformer. Electrical Engineering, 2015, 16(06): 84-88.
2015, Vol. 16 
