Study On Single-phase Earth Fault Location For Distribution Network Based On Wireless Sensor Network

The neutral ineffectively grounded systems are adopted mostly in MV powerdistribution networks. The advantages of this kind of system are highly reliability andsmall current when single-phase-to-earth fault happened. Fault location ofsingle-phase-to-earth in neutral ineffectively grounded system has not been wellresovled due to its little current and complicated conneetion of the branches.In order to monitor the zero-sequence current parameters real-time, provide aguarantee to fault location method based on zero-sequence. Based on the study ofzero-sequence current increment method, in this paper, a distributed zero-sequencecurrent collection method and a single-phase ground fault location system indistribution network is developed, which applies the rapid development of ZigBeewireless sensor network technology.Content and results of this study include the following:①ZigBee wireless sensor network technology is researched, and the overallscheme of the wireless sensor network technology with single-phase ground faultlocation is proposed. Simulations show that the scheme for the accurate positioning ofthe distribution network match single phase ground fault. The key issues in the faultlocation and Anti-jamming measures of the system are researched.②On the basis of CC2530ZDK wireless sensor network development platform,Acquisition system based on the wireless current sensor line of distributed zerosequence current is designed. IAR Embedded Workbench for software developmentplatform development and porting of the node hardware design of the Z-Stack protocolstack to achievecoordination of the current node and the current sensor nodedata.synchronization collection, transmission, and wireless sensor networks,networking, completed system software and hardware debugging is researched.③Distributed zero-sequence current acquisition system is proposed. Acquisitionexperiments in a lab environment to simulate zero-sequence current results show thatthe coordination node and the design and development of wireless current sensor nodessimple operation, reliable performance. The overall performance of the distributed linezero-sequence currentacquisition system to meet the distribution network linezero-sequence currentmonitoring requirements, provides a new method for real-timegrasp the line zero-sequence current distribution network. ④For the distortion data on the fault location, single-phase ground fault locationmethod based adaptive binary differential evolution algorithm is proposed. Through theuse of the individual evaluation function value of adaptive factor variation andcross-probability, improve the convergence speed of the network. Simulation resultsshow that Fault locator output to determine the default fault.