STEPPED ELECTRIC FILED INSULATION SYSTEM FOR DYNAMOELECTRIC MACHINE Russian patent published in 2007 - IPC H02K3/30 H02K3/40 H02K15/10 

FIELD: electrical engineering.

SUBSTANCE: proposed invention is concerned with characteristic features of ground insulation capable of sustaining voltages higher than 4 kV, best of all 13.8 kV or higher still used for dynamoelectric machines. Machine winding insulation or conductor ground insulation has two layers. First internal layer covers conductor and has first predetermined thickness and first predetermined dielectric constant; second insulation layer has second predetermined thickness and second predetermined dielectric constant lower than that of first one. First and second insulation layers have mica paper strip, different type of mica being used for each strip with the result that pattern of electric field across ground insulation at first-to-second layer transfer point abruptly rises causing occurrence of electric field close to conductor whose strength is maximal and lower than that of known insulation systems. In this way maximal value of local electric field pattern within ground insulation reduces.

EFFECT: enhanced service life and reduced thickness of insulation.

15 cl, 7 dwg