Abstract
Large industrial motors fail occasionally due to stress on turn insulation. Fast surges resulting from switching on and off operations of industrial motors cause severe stress on insulation due to non-linear voltage distribution across the winding. In order to determine the voltage distribution in a typical 11 kV motor coil, theoretical analysis using electromagnetic transient program and experimental measurements using recurrent surge generator have been carried out. The terminal end coil of 11 kV motor is modeled by an equivalent electric network comprising the self and mutual inductances, series and shunt capacitances. Surge voltage of impulse type and other rise times are applied at the nose of the coil to determine the voltage stress in the inter turn insulation. The comparison is made between measured and computed results. This study is useful to industrial motor designers to design reliable motors.
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