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The short-medium term behaviour of pure and nanocomposite polypropylene is investigated: in particular both breakdown voltage tests and electrical aging tests are performed applying sinusoidal waveforms at industrial frequency (50 Hz) to the studied materials. The nanocomposite material is obtained by the dispersion of 10% by wt. of inorganic nanosized clay inside the organic polypropylene (PP) matrix...
Several electrical aging tests have been carried out on twisted pair specimens prepared by winding wires having conventional or nanostructured enamel insulation. The conventional enamel is polyamide-imide, while the nanostructured enamel is a polyamide imide - silica nanocomposite. The tests have been performed applying sinusoidal voltage at two different frequencies. The partial discharge (PD) signals...
Partial discharge (PD) pattern recognition and interpretation is still often the key to assess the presence and the nature of defects inside electrical insulation. In the case of external PD source, as when surface partial discharges are concerned, the PD pattern can be strongly influenced by the environmental conditions. This work presents the experimental outcome of a PD measurement campaign performed...
Partial discharge (PD) measurements can be a very powerful tool for the condition assessment of electrical insulation systems. When applied to rotating machines or winding insulation mock-ups, if pulsed power supplies are considered (PWM), PD measurement can provide not only an "on/off output about the presence or not of PD pulses but could also provide information about the degradation processes...
Partial Discharges (PDs) measurement deserves a specific study when in the presence of fast rising/falling voltages, as the output of IGBT switching devices. In such operating conditions, the choice of a proper detection system is crucial in order to have the best signal to noise ratio and to solve some problems linked to the specific characteristics of the voltage waveform. This work proposes a comparison...
This work is aimed at investigating the effect of voltage harmonics on electrical treeing inside cross linked polyethylene (XLPE). The study focus on the partial discharge (PD) activity associated to electrical treeing, which changes with the harmonic content of the supplied voltage. Different frequency components have been superimposed to a sinusoidal basic waveform and have been applied to suitable...
The present work concerns the partial discharge (PD) activity in simple insulating system (twisted pairs) when switching voltage waveforms are applied. A special low frequency PD coupling system allowed to determine two quantities indicating the stress actually connected with the PD activity. Such parameters have been considered to determine life prediction models
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