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The electronic switching converters used to supply squirrel cage motors can cause, during the normal operation, some critical problems leading to the early failure of the stator winding insulation. In fact if the electrical motors are supplied by switching electronic converters, the stator insulating system is subjected to voltage waveform having high frequency content (e.g. PWM); this kind of voltage...
This work investigates thermoplastic polymeric blends based on low density polyethylene and ethylene vinyl acetate mixed together in 80:20 weight ratio. These blends have been mixed with montmorillonite and silica as fillers to obtain nanocomposites with different nanofiller amounts: percentage of 3% and 7% by weight have been chosen. The aim is to identify a new class of insulating materials for...
Nowadays a lot of high voltage components are insulated by sulfur hexafluoride gas. This gas is unfortunately one of the main responsibles for the progressive increase of the global temperature: for this reason the sulfur hexafluoride gas should be substituted involving the need to find different gases or gas mixtures more environment-friendly. Furthermore it is well known that sulfur hexafluoride...
The adoption of switching electronic converters for squirrel cage motor drives can lead to some critical issues during the normal operation. The early failure of the stator winding insulation is one of the most investigated problems. The cost of motor failure is measured by interruption of plant output as well as extent of repair or replacement. The Surge Test is one of the most important tests for...
The adoption of switching electronic converters for squirrel cage motor drives can lead to some critical issues during operation. Among the others, one of the most deeply investigated problems is the early failures of the stator winding insulation. When the motors are supplied by power electronic converters the stator insulation system is indeed subjected to some peculiar electrical stresses; the...
Electrical machines and in particular electrical motors used in industry applications are usually coupled with inverter drives in order to better control both the motor torque and speed. Due to the presence of these inverter drives, the stator motor windings are subjected to severe voltage waveforms. When the electrical motors having stator windings insulated by means of type I random wire wound are...
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