Influence of pressure on partial discharge spectra

摘要

In the near future, the aircrafts will become more compact and lighter, since hydraulic, pneumatic or mechanical systems will be replaced by electrical ones. The network voltage is expected to increase far above Paschen's minimum, thus increasing the risk of partial discharges. These discharges, also known as silent enemies, may affect the reliability of the systems. Moreover, some electrical equipments are located in unpressurized areas so their operating conditions (temperature, pressure) may change in a large range. These environmental parameters (and their cycling) have a large impact on discharge inception voltage and may even modify its nature. This paper deals with the influence of the pressure on partial discharges and more particularly on the modification of partial discharges spectra with pressure. Twisted pairs of enamel wires were subjected to repetitive square voltage waveform and sinusoidal voltage at various pressures.