Complete Fault Analysis for Long Transmission Line Using Synchronized Sampling

This chapter presents a complete fault analysis scheme for long transmission line represented with distributed parameters. The synchronized samples from both ends of the transmission line are the data sources for this scheme. The chapter derives a specific feature that equals to zero for normal situation and external faults, and is close to fault current during the internal faults. This feature is used for fault detection and classification. Fault location is then implemented by selecting different methods according to the classified fault type. The performance evaluation is based on randomly generated fault scenarios, which can demonstrate the statistical performance and robustness of the proposed scheme in all kinds of situations. With the availability of the synchronized data from two ends, the fault analysis can be very accurate. The proposed scheme can be implemented in an integrated software package as an add-on function for digital fault recorder. The results from a comprehensive evaluation study demonstrated an excellent performance of entire fault analysis.