GRR Resistance calculation. Home › Electrical Engineering Forum › General Discussion › GRR Resistance calculation. This topic has 0 replies, 1 voice, and was last updated 11 years, 2 months ago by biswajit2157. Viewing 1 post (of 1 total) Author Posts 2013/02/06 at 7:01 pm #10961 biswajit2157Participant If the slip ring induction motor’s rotor voltage is 1250 v & roator amps is 450 amp then how do i calculate the resistance needed for speedcontrol of a delta connected GRR. for required 18 nos of step? any answers are appriciated Author Posts Viewing 1 post (of 1 total) You must be logged in to reply to this topic. Log In Username: Password: Keep me signed in Log In