| 摘要 |
In a rotating electrical machine (1), a conductive foil or conductive rubber (205, 207, 209 or 211) is applied to the surface of insulation layer (303) of a conductor series connection area (506) or to the surface of insulation layer (403) of a turn conductor (401) of coils of rotating electrical machine winding (4), waveforms of grounding voltages of the individual turn conductor portions (507) are measured through the medium of an electrostatic capacitance of the insulation layer (303) of coil conductor series connection area (506) or through the medium of the insulation layer (403) of coil turn conductor (401), and a partial discharge is measured while measuring a voltage developing in the coil or across a winding turn (507) in the coil from a difference between the waveforms of grounding voltages. |
