Partial Discharge Characteristics of Aeronautical Cables at Low Pressure
Jiang Jun1, Li Zhi1, Zhang Bendong2, Li Wenyuan3, Zhang Chaohai1
1. Center for More-Electric-Aircraft Power System Nanjing University of Aeronautics and Astronautics Nanjing 211106 China; 2. State Grid Shandong Electric Power Company Lai Wu Power Supply Company Jinan 250000 China; 3. School of Electrical and Electronic Engineering The University of Manchester Manchester M60 1QD United Kingdom
Abstract In order to achieve the electrification of aircraft, the risk of partial discharge (PD) of cable insulation in the electrical system of more-electric-aircraft is increasing with the constant increase of power supply and voltage level. The partial discharge characteristics of aeronautical cables at low pressure and typical frequency were investigated by setting three typical models: cable to ground metal plate discharge, cable to cable rack discharge and cable to cable discharge. The experimental results show that the partial discharge inception voltage (PDIV) of the three types of discharge models decreases with the decrease of pressure, and the PDIV of cable to cable discharge models is more than two times higher than that of other models when the pressure is above 50kPa. The increase of voltage frequency significantly increases the discharge repetition rate of models, and the effect is obvious for cable to cable rack discharge at 10kPa. In the same condition, the phase width and the strength of "polarity effect" of phase-resolved partial discharge (PRPD) spectrum for different discharge models varies. The characteristics are helpful to the identification of discharge model types, and can provide reference for the design and fault diagnosis of aeronautical cables.
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2022, Vol. 37 
