| 摘要 |
PURPOSE:To make the equipment simple and inexpensive by measuring the distance to a fault point from voltage and current information in the power system. CONSTITUTION:A positive voltage component at the set point of a locator in the sound operation is inputted into an input terminal 101. A zero current component is inputted into an input terminal 102 while the zero voltage component at the set point of the locator inputted into an input terminal 103. A positive phase current component is inputted into an input terminal 105 to memorize positive phase currents IL and IF in the sound operation and at the fault into a memory circuit 107. An integration circuit 108 integrates outputs of the input terminal 101 and an arithmetic circuit 104. An arithmetic circuit 109 computes output of the memory circuit 107 and output from a power source voltage. Components of the arithmetic circuit 104 and the memory 107 are inputted into an integration circuit 110. An arithmetic circuit 113 divides the output of an addition circuit 111 by the output of an addition circuit 112 to compute the distance (x) to a fault point and outputs the results to an input terminal 114.
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