| 摘要 |
PURPOSE:To make it possible to test a ground directional relay even when the ground capacitance and the like of main circuit are low and to realize downsizing of test facility, power supply capacity, and the like. CONSTITUTION:In an equivalent test for confirming a ground directional relay 67G circuit, including a ground instrument transformer GPT and a zero-phase current transformer ZCT, by applying the high voltage side voltage of a booster transformer Tr, as an equivalent zero-phase voltage, to a main circuit, equivalent zero-phase current is increased by feeding a low voltage side current ni0 or the sum of high and low voltage side currents (n+1)i0 through the zero-phase current transformer. |
