Abstract：Research purposes: High reliability of power supply is required for railway continuous power transmission line，however，the single—phase—to—ground fault often occurs on the lines，which Can cause power supply interruption and bring the risk to the traffic safety．How to precisely diagnose and quickly eliminate the single—phase—to—ground fault has become a problem to be solved urgently for the railway departments．The accuracy of fault location call not meet the requirement of rapid sectioning the fault with the impedance method and traveling wave method．According to the structural characteristics of the railway continuous power transmission line and the requirements of the rapid sectioning the fault，the study is done on the method for the interval location．
Research conclusions: Through the study，the lumped parameter interval algorithm，fault network decomposing interval algorithm and distributed parameter interval algorithm were deduced by using interval analysis method．The PSCAD simulation analysis Was made for the actual transmission line model to verify the feasibility of interval location method．In order to further test its practicability in engineering，the field simulated tests were done with the three algorithms for railway continuous power transmission line from Kaili to Fuquan．The tested results fully met the requirements of precision and rapidity for fault location．Both the theoretical calculation and factual tests had shown that the using Interval algorithm could effectively solve the problem of fault location railway continuous power transmission line．
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2010, Vol. 27 
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