TORELLO , E.

In order to recognize on-line different kind of defects where partial discharges take place it is necessary to employ an embedded acquisition system, possibly low-cost, near to the discharges site. Such acquisition system should be capable to analyze the acquired data in real time to recognize different defect sources. For this reason, a single...

The purpose of this work is to analyze how the presence of combined AC-DC voltages can influence the partial discharge (PD) activity. A DC offset can be introduced by power electronics components affecting the partial discharge inception voltage (PDIV). If the PD phenomenon is the main cause of the electrical insulation degradation, the...

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The main insulating system components of stator windings of rotating electrical machines are organic enamel and impregnating resin. When power electronic converters supply motors, the stator insulation system is subjected to voltage waveforms such as PWM composed by trains of pulses. Due to reflection phenomena, overvoltage can be associated to...

The environmental matters fostered the power generation using renewable energies. This led, among the different possible solutions, to the diffusion of wind farms for wind power generation. Different types of sensors capable to detect the Partial discharges (PD) activity in the power generator and in the other electrical apparatuses installed...

The insulating system of stator windings of rotating electrical machines are usually based upon organic enamel as primary insulation and impregnating resin used for the secondary insulation. When the motors are supplied by power electronic converters, the stator insulation system is subjected to voltage waveforms such as PWM composed by trains...

The PRPDA (Phase Resolved Partial Discharges Acquisition) systems usually employ 8 bits mathrm A/mathrm D converters. Avoiding the converter saturation, it has been necessary, during the measurements, to set the reference voltage on the expected maximum PD signals magnitude. There is an amplitude threshold below which PD signals are not...

Nowadays the massive adoption of electronic converters to supply electrical motors leads to critical problems during the normal operation. In fact when the motors are supplied by electronic converters, the stator insulating system could be subjected to over voltages due to reflection and resonance phenomena. Frequently this over voltages exceed...

The aim of this work is the investigation of the performances of nanocomposite materials in the presence of electrical treeing. The nanocomposite materials based on polyolefin matrices were prepared by extrusion and then molded into slabs from which it was possible to prepare apposite specimens to perform electrical treeing tests. The polymeric...

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