Reactive power factor. Home › Electrical Engineering Forum › General Discussion › Reactive power factor. This topic has 4 replies, 3 voices, and was last updated 13 years, 4 months ago by Hamdullah. Viewing 5 posts - 1 through 5 (of 5 total) Author Posts 2011/08/25 at 5:15 am #10535 HamdullahParticipant Dear all relatted to Power! How to calculate reactive power factor ? 2011/08/25 at 5:52 pm #12423 adminKeymaster P = kW, Q = kVAr (inductive (+Q), capacitive (-Q), S = kVA. S = (P^2 + Q^2)^-2 kW / kVA = cos (x), cos (x)^1 = power factor 2011/08/25 at 5:55 pm #12424 adminKeymaster Mistake there, Power factor = cos (x)^-1 2011/08/25 at 8:58 pm #12430 HamdullahParticipant Dear where the mistake is, is that in yours fomula? 2011/08/26 at 12:22 pm #12419 jaymez83Participant I made a mistake at the end, it should be cos (x)^-1 not cos (x)^1, kW / kVA = cos (x), cos (x)^-1 = power factor. Author Posts Viewing 5 posts - 1 through 5 (of 5 total) You must be logged in to reply to this topic. Log In Username: Password: Keep me signed in Log In