METHOD FOR MEASURING DIELECTRIC LOSS TANGENT OF POWER CABLE

摘要

PROBLEM TO BE SOLVED: To accurately obtain dielectric loss tangent by extremely reducing the influence of a measurement error and temperature change due to the difference in a manufacture by excluding the influence of the dielectric loss tangent of a voltage detection part. ;SOLUTION: A preamplifier 40 amplifies a voltage induced at a voltage detection part 25 to a specific level before outputting. A phase compensation part 41 compensates the phase deviation of a voltage which is amplified by a certain amount by the preamplifier 40. Namely, the phase compensation part 41 compensates the phase of a voltage detected by the preamplifier 40 according to the amount of phase deviation for the resistance of the voltage detection part 25 and makes an adjustment so that the phase deviation becomes zero before outputting. The voltage phase of the voltage induced at the voltage detection part 25 can be detected. A dielectric loss measuring equipment 42 obtains dielectric loss tangent from the difference between a voltage phase induced at the voltage detection part 25 which is compensated by the phase compensation part 41 and current phase flowing to the grounding wire.;COPYRIGHT: (C)1997,JPO