... 8p 10p 12p 1. General Description Y,YR series,YKK,YKS,YRKK,YRKS series medium sized high voltage three-phases asynchronous ... reaching the inside for repair and maintenance. Y,YR series are the basic series with enclosure protection degree IP23. Removing the ... operation. 5. Stating of squirrel cage induction motors (Y,YKS, YKK series) For design of squirrel cage induction motors, advanced calculation ...