| 摘要 |
PURPOSE:To take a high-precision measurement of sheath loss by constituting a three-phase closed circuit by using an auxiliary line for measuring the sheath loss of each phases of asymmetrically arranged cables arranged in parallel, and conducting the circuit by a ring transformer. CONSTITUTION:Two cables 4 and the auxiliary line 10 arranged at distance from them are laid in parallel to constitute the three-phase closed circuit by using a lead wire 11 for feeding, and this circuit is fed with a three-phase current by the ring transformer 7. Then, a voltage lead wire 6 is wound around the cables 4 and auxiliary wire 10, and one-side terminals of them are short-circuited while the other-side terminals are connected to voltage terminals of a power meter 9. Then, the circuit is powered on by the ring transformer 7. Consequently, the loss P1 in the feeding circuit is measured by the power meter 9. Then, a sample 5 is installed at a desired position near the cables 4 in said state, and the loss of the sample 5 is expressed P=P2-P1, where P2 is the loss found by the power meter 9.
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