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With the advanced technology on power electronics, a lot of inverter-fed motors have been manufactured and operated in the actual market of hybrid cars and so on. However, the coil insulation system of rotating machines and transformers is afraid to be affected by the "inverter surge voltages" characterized by short rise-time and high repetitive frequency. Thus, in order to make clear the trend of partial discharge (PD) measurement and electrical insulation technologies under inverter surge voltages, the technical committee comprehensively investigated not only fundamental items such as transient surge voltage analysis, PD measurement techniques, PD characteristics, insulation deterioration and life characteristics, but also practical items such as surge resistant enameled wires, inverter surge insulation and testing method for different equipment. On the other hand, an IEC document (IEC61934TS) on PD measurement under repetitive voltage impulses has been published, however, it is under revision because of the technical insufficiency on sensitivity check, etc. The technical committee members also carried out the round-robin test for PD measurement under inverter surge voltages.
From the above technical background and international trend, this technical report reviewed systematically and exhaustively the up-to-date technology and future perspectives on PD measurement and related fields under inverter surge voltages. We believe that this technical report will contribute to not only the equipment and material engineers on inverters, motors, transformers and so on, but also researchers and students on discharge phenomena, insulating materials, measurement techniques and so on. |
