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Chen Y.-P.,Zhejiang Jiaxing Electrical Power Bureau | Fei Y.-Z.,Zhejiang Jiaxing Electrical Power Bureau | Zhu J.-H.,Zhejiang Jiaxing Electrical Power Bureau
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | Year: 2011

To solve the problem that there are no unified standard, scope and method in the present digital substation secondary equipment maintenance, this paper studies the impact of using ECT/EVT on the relay protection device, when the process layer uses digital sampling and the sample values transmitting uses network. Combined with the dynamic simulation test result for 110 kV Tianle digital substation in China Academy of Dynamic Simulation Laboratory, this paper designs a new test and brings forward the scope, method and standard of the digital substation secondary equipment maintenance based on IEC61850-9-2. Source


Chen Y.-P.,Zhejiang Jiaxing Electrical Power Bureau | Mu G.-P.,Zhejiang Jiaxing Electrical Power Bureau | Xu W.-M.,Zhejiang Jiaxing Electrical Power Bureau | Wang S.-C.,Zhejiang Jiaxing Electrical Power Bureau
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | Year: 2010

This paper states the necessity and the characteristics of the current transformer ratio test, reviews two normal methods of the CT ratio test in brief, i.e. short-circuit method and current method. It brings forward new method of the CT ratio test by measuring voltage in primary side and secondary side of the CT without disassembling it, and analyzes the theory and the main factors causing errors of the new method. In the test, it adopts anti-interference method and applies AC voltage on secondary side of CT with I/V characteristic instrument to measure voltage of primary side and secondary side. The CT ratio test and I/V characteristic test are carried out as well. Source

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