| 摘要 |
PURPOSE: To detect and judge a faulty section of an isolated neutral system transmission distribution line easily. CONSTITUTION: When a ground fault occurs between a power source side orientation device 20a and a load side orientation device 20b provided along transmission lines 4, the directions of fault currents 10 flowing to the sides of a fault spot 5 being between both orientation devices 20a, 20b are opposite to each other. Accordingly, the waveforms of fault voltages and fault currents have the same polarity in the orientation device 20a, and have reverse polarities in the orientation device 20b. As a result of this, an integrated waveform of the fault current waveform observed by the load side orientation device 20b and the fault voltage waveform have reverse polarities, and the integrated waveform of the fault current waveform observed the power source side orientation device 20a and the fault voltage waveform have the same polarity. By detecting this, it is judged that the fault spot 5 is between the orientation devices 20a, 20b and the section is oriented as a faulty section. |
