METHOD FOR DETECTING WATER LEAKAGE OF COIL AND WATER LEAKAGE DETECTOR APPLICABLE TO THIS METHOD

摘要

In the method for detecting water leakage of a coil, when detecting whether cooling water supplied to the conductor of a coil coated with an insulation layer has leaked to the insulation layer or not, an AC voltage or a DC voltage is applied to the conductor, a surface electrode device is applied to the insulation layer, the surface electrode device is grounded through an impedance, potential of the surface electrode device is measured, and a decision is made that water has leaked from the conductor to the insulation layer if the measured potential is higher than that of a flawless coil.