Abstract：This article concludes and analyses the common problems on secondary system protection taking the Tianjin Yusheng 35kV substation as the example research. Study on the influence of transformer differential protection when external short circuit fault happens on the delta side of the yd-11 transformer. The article clearly puts forward the installation requirement of zero-sequence CT of double cables Parallel and cable shield wires. It Provides operational experience for small resistance grounding in the future.
武琼, 曹永进, 唐其筠, 左军, 王新铭. 配网小电阻接地改造二次常见问题分析[J]. 电气技术, 2016, 17(8): 126-129.
Wu Qiong, Cao Yongjin, Tang Qijun, Zuo Jun, Wang Xinming. Analysis of Secondary System Common Problems of Small Resistance Grounding in Distribution Network. Electrical Engineering, 2016, 17(8): 126-129.
2016, Vol. 17 
