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In order to investigate the influences of dead time in power electronic pulse width modulation (PWM) algorithm on the properties of insulation for inverter-fed motor, we built a repetitive pulse generator with 2-10 μs of dead time using full-bridge solid-state switch and high speed and real time control technique. Under the bipolar repetitive pulse voltage with 4 kV of peak to peak voltage and 5 kHz of frequency, the effect of repetitive square wave voltage dead time on the partial discharge (PD) statistical characteristics and corona-resistant lifetime of inverter-fed motor insulation were investigated through turn to turn insulation tests and ultra-high frequency test. The results show that the increase of dead time may significantly increase the attenuation effect of surface discharge at the rising edge and falling edge of repetitive square wave, weakens the inhibition of surface charge reverse electric field on discharge in discharge process. The number of discharge increases, and the electrical ageing of insulation accelerates, which leads to the decrease of corona-resistant lifetime of turn to turn insulation for inverter-fed motor. It is concluded that when adding dead time to protect the power device in designing power electric system, we should pay attention to the effect of dead time on the accelerated ageing of insulation system in inverter-fed motor, increase the insulation margin properly.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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