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You J.,Shanghai Extra High Voltage Transmission Company | Wu R.,Shanghai Extra High Voltage Transmission Company | Ye K.,Shanghai Extra High Voltage Transmission Company | Bai Q.,Shanghai Extra High Voltage Transmission Company | And 2 more authors.
Dianli Xitong Zidonghua/Automation of Electric Power Systems | Year: 2011

A blackout occurred in East China power grid in 2009 and its evolution process are introduced. In accordance with three stages of failure development, status of equipment concerned and protection information are analyzed respectively. Analysis shows that the fault is a rare and complex one, but improper blocking between 35 kV bus coupler auto-switching (BCAS) and bus differential protection (BDP) is a contribution factor to escalation of the fault. Based on dissection of the BCAS protection and BDP principles in this substation, the mutual blocking relationship between these two protections is analyzed, and hidden failures in the design is pointed out. Eventually, the advices and precaution measures are presented. © 2011 State Grid Electric Power Research Institute Press. Source


You J.-X.,Shanghai Extra High Voltage Transmission Company | You J.-X.,Zhejiang University | Peng M.-W.,Zhejiang University | Tang Y.-Z.,Zhejiang University | And 4 more authors.
Gaodianya Jishu/High Voltage Engineering | Year: 2010

According to the features of the SCADA and WAMS, we proposed a novel fault diagnosis method using power flow. The mathematic condition to assure unicity of fault diagnosis is deduced, which gives primary principle to PMU installation. In this method, fault diagnosis is accomplished by means of pattern identification, under which the power flow in observable area obtained by WAMS is compared to the fault patterns that is generated dynamically. With this method, single branch fault and most double branches fault can be tracked real-timely even if the PMU installation is insufficient. Different kinds of faults are simulated in IEEE-14 system, the simulation result reveals the effectiveness. Source

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