More Electric Aircraft (MEA) adopts electricity to replace some traditional mechanical parts, which can effectively improve flight efficiency and reduce emission of greenhouse gases. To enhance the capacity of the MEA power supply system, potential supply voltage will reach up to several kV, which will lead to severe risk of partial discharge. Two typical insulation failures of turn-to-turn discharge in the aviation machine and cable-to-ground discharge of the MEA are modeled in the laboratory. A number of experiments are carried out to explore the influence of air pressure on Partial Discharge Inception Voltage (PDIV), discharge amplitude, discharge repetition rate and Phase-Resolved Partial Discharge (PRPD) at 400 Hz sinusoidal voltage and 1-101 kPa air pressure. Experimental results show that PDIV decreases linearly with air pressure under different models. As the air pressure decreases, discharge amplitude increases first and then decreases, and the discharge repetition rate gradually increases. According to analysis of the cumulative discharge amplitude, the highest point always appears at 30 kPa. As the air pressure decreases, PRPD with two insulation failures offsets left together, and phase width gradually increases. The PRPD in turn-to-turn discharge and in cable-to-ground discharge are characterized by "rabbit ears" and "polarity effect", respectively. Our study can contribute to insulation testing and evaluation of the MEA electric system, and the results are expected to provide reference for the development of high power and high voltage electric system in MEA.
ZHANG Bendong
,
JIANG Jun
,
LI Zhi
,
LI Shimin
,
ZHANG Chaohai
. Partial discharge characteristics of future more electric aircraft under low air pressure[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2022
, 43(7)
: 325374
-325374
.
DOI: 10.7527/S1000-6893.2021.25374
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