The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
During the last decade, insulated-gate bipolar transistorbased electronic devices have increasingly been adopted to control the power supply of drives associated with Type I randomwound rotating machines, and new reliability problems have surfaced [1]. Pulse width modulator drives that are associated with these machines produce voltage waveforms having fast rise time fronts, and overvoltages at the...
This paper presents the outcome of a partial discharge test campaign performed on random wire wound stator insulation of electrical motors. The test campaign was carried out in the frame of a rewinding program involving some units that experienced early failures due to insulation breakdown. The cause of the early failures was targeted to the pollution of the motors due to the harsh environment. Besides...
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...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.