الفهرس 
Double-end technique
Simulation Results for the Proposed AlgorithmOnly 14 pages are availabe for public view
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Abstract
Identifying a fault location in case of simultaneous fault by using traveling wave techniques has rarely been studied in the literature. The proposed algorithm in this thesis identifies the simultaneous fault case and calculates the location of the two simultaneous faults in the transmission line whether there is a time shift between the two faults or not by using a combination between single and double-end techniques in addition to fault signature. For analyzing the high-frequency transient signals generated during the faults, the first detail of discrete wavelet transform (DWT) was used. For simultaneous fault occurring at the same location, the time shift between occurring them must be at least 0.0034744 ms but if the type of both of the two faults is three-phase fault or three-phase to ground fault, the fault will be classified as a single fault regardless the time shift between them. In the proposed algorithm, there are seven cases covering all the simultaneous fault scenarios. The first four cases need to calculate the signature of one of the two faults to calculate the location of the other one, but in the remaining three cases, there is enough information to calculate the fault location for the two faults directly by the equations. For the single fault results, the fault location average accuracy is 99.95%. For simultaneous faults, the location and the type of the two faults in addition to the time shift between them affect the equations used to calculate the fault location. Therefore, the average accuracy of calculating the two faults depends on their location, their type and the time shift between them. An average accuracy of 99.91% is achieved by the proposed algorithm in case of the simultaneous fault.