| 摘要 |
PROBLEM TO BE SOLVED: To execute an actual load direction test without distinguishing between a tertiary circuit and a secondary residual circuit.SOLUTION: An actual load direction testing device includes: an R terminal 12A, an S terminal 12B, a T terminal 12C and an N terminal 12D at an input side; an R terminal 13A, an S terminal 13B, a T terminal 13C and an N terminal 13D at an output side; a measuring instrument connection terminal 13E and a zero-phase current terminal 13F connected with the N terminal 13D; and a switching circuit 10 for switching a direction test by switching connections between the R terminal 12A, the S terminal 12B, the T terminal 12C and the N terminal 12D at the input side and the R terminal 13A, the S terminal 13B, the T terminal 13C and the N terminal 13D at the output side for discrimination between a power transmitting side failure and a power receiving side failure. The R terminal 12A, the S terminal 12B, the T terminal 12C and the N terminal 12D at the input side are connected via an input side of at least one CT secondary plug and a connection line and the R terminal 13A, the S terminal 13B, the T terminal 13C and the N terminal 13D at the output side are connected to an output side of the CT secondary plug via a connection line. |
