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A newly developed web-based fault locating technology for transmission lines and its experience in the field

This paper describes a newly developed fault locating (FL) system using Internet technology. The method using current and voltage data at one terminal for FL has been applied, and good results have been obtained. But this method has theoretical error in multi-terminal transmission lines because of the influence of the fault current from the terminal without FL equipment. It is necessary for precise fault location to gather the data from all of the terminals connected to the faulted fine. Internet technology has progressed remarkably and enabled us to gather the data easily from distributed multi-terminals. The proposed FL system uses current, voltage data and status information of power apparatus of multi-terminals via Internet communication. By using these data, fault-locating accuracy of proposed FL system improves remarkably. The network for transmitting information is constituted by general network devices. To perform fault location, a general PC is used. Moreover, for the acquisition of real-time information from power system, compact terminal devices are used. These devices have micro web servers for realizing the data transmission over HTTP. This combination of Internet technology and real time processing technology realized low-cost and high-performance FL systems. The proposed system has been in practical use in Chubu Electric Power Co. Inc.. and excellent results have been obtained.