Patent ID: 9331540
Filing Date: 2016-05-03
CPC Classification: H02K

Claim Text:
1. A winding of a rotating electric machine, comprising a conductor and a groundwall insulation surrounding the conductor, and an end winding corona protection arranged on the outer surface of the groundwall insulation, wherein the end winding corona protection comprising a first layer; wherein the surface resistance of the first layer is in the range of 10 Ohm to 200 Ohm, and in that the end winding corona protection further comprises a second layer arranged on the outer surface of the first layer, wherein the second layer is made of semiconductive material with a resistance of the second layer perpendicular to the surface is in the range of 100 MOhm/mm wherein the end winding corona protection further comprises a third layer arranged on the outer surface of the second layer, the third layer having a surface resistance in the range of 1 kOhm to 10 kOhm.