Partial Discharge Simulation and Characteristic Analysis of Aviation Cables Under High dV/dt Voltage
As the development of More-electric-aircraft(MEA)advances,there is a continuous increase in voltage levels and power density.The effective application of new power electronic devices has significantly raised the energy density of aircraft as well as increased the risk of partial discharge(PD)under high dV/dt voltage.This paper conducts a joint simulation based on the electric field model.Through numerical calculation,field strength analysis,and experimental comparison,combined with aviation cables PD testing,the mechanism of PD with rise time and frequency under high dV/dt voltage is deeply explored.The results show that the reduction of rise time has a significant effect on discharge.When 50 ns is compared with 250 ns,the cumulative discharge amplitude and number of discharges of the model increase by more than 80%.The discharge delay and the recovery time of the air gap electric field have also experienced a noticeable decrease.The increase in frequency has an"inflection point"mechanism for the impact on PD.Around 1 kHz to 10 kHz,the dielectric loss effect significantly enhances the occurrence of discharge.The discharge amplitude and discharge times both show an increasing trend.In the higher frequency band,the charge accumulation effect dominated by shortened electrical level inhibits discharge.This paper provides reference for the design,testing and evaluation of aviation cables insulation under high frequency,high voltage and high dV/dt voltages in MEA electrical systems.
electric field modelaviation cableshigh dV/dtpartial dischargerise timefrequency
万方数据
维普
