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To study the influence of aging on time dielectric spectroscopy, the polarization/depolarization current method in time domain dielectric response technique is used for the aging state of generator insulation. Therefore, a multi-factor test is carried out for stator bars and the polarization/depolarization current is tested for stator bars after different aging time. Meanwhile, the influence of different...
Inverter-fed traction motors, which are employed for electric-multiple-units (EMUs), are subjected to Pulse Width Modulated (PWM) impulse voltage. Impulse voltage has fast rise/fall time and high repetition frequency. The failure mechanism of insulation under impulses is different from that of standard 50 Hz sinusoidal condition. Partial discharge (PD) characteristics (discharge number, mean discharge...
In this paper, leakage current flowing along contaminated ceramic insulators was separated into low frequency component and pulse component, which were detected respectively by Rogowski coil in artificial contamination tests. The effects of the operating voltage, the equivalent salt deposit density and humidity on the two characteristic components of leakage current were investigated. It is revealed...
Presently, polyimide film is applied widely in turn-to turn insulation and turn to ground insulation of inverter-fed traction motors as one kind of special project plastic film. In this paper, the measurement of partial discharge is done on nanometer hybrid polyimide film and non nanometer polyimide film with different frequency and different rise time under high-frequency square impulse. Some parameters...
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