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Research of Cable Grounding Fault Location Based on Wireless Sensor Networks

In order to realize the fast diagnosis of the location and type of fault point in distribution network, a scheme of fault location for cable grounding based on WSN is proposed. Firstly, the structure of cable grounding fault location system based on WSN is designed, collection of zero-sequence current in Cable using Sensor Node, the real-time zero-sequence current information of each node is transmitted to the fault information processing center through the communication between the aggregation node and the gateway. Then, using the known topology of wireless sensor network, the information processing center combines the change of zero-sequence current amplitude before fault position when the parameters of arc suppression coil is changed is greater than that of zero-sequence current amplitude change after fault location. The fault location can be determined quickly. Finally, the 10kV cable line model is established, and the feasibility of the scheme is simulated and analyzed. The result shows that the scheme can accurately determine the location of grounding fault according to the change of zero-sequence current amplitude, and solve the problems of short positioning distance, long positioning time and poor positioning effect by traditional fault location technology. It has high application value for fault location of cable lines in a wide range.