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How is it possible to calculate cos(ph) by using KWH meter?

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تم إضافة السؤال من قبل vahid mottaghi , New Technology Dept. Manager , Isfahan Power Distribution Company
تاريخ النشر: 2014/07/04
Aleeman Shah
من قبل Aleeman Shah , Electrical Maintenance Engineer , Careerfirst

COS(pi)=KWH/sqrt[(KVARH)^2+(KWH)^2] using Power triangle

Yehia Adlouni
من قبل Yehia Adlouni , Engineering Maintenance Manager , Birchwood Foods

BY using the following formulas:

KW=KWH/24

KW=(√3 X V X A X Cosᴓ) /1000

Cosᴓ = (KW X1000) / (√3 X V X A)

vahid mottaghi
من قبل vahid mottaghi , New Technology Dept. Manager , Isfahan Power Distribution Company

Answer is :

KWH/sqrt[(KWH^2)+(KVARH^2)]=cos(PH)

Majid Khan
من قبل Majid Khan , Rig Electrican , Oil & Gas Development Company Limited

we can find simply by the power triangle formula 

cos(phi)=KWH/sqrt[(KVARH)^2+(KWH)^2]

مستخدم محذوف‎
من قبل مستخدم محذوف‎

  • It is possible to find  cos phi from KWH meter if load current and applied voltage is constant.
  • From KWH meter record the units (KWH) consumed in1 hour. This will be KW rating of load.
  • Measure voltage and current passing to load.
  • Cos Phi = (KWH consumed in1 hour)/ ( voltage X load current)
  • Accuracy of calculation will be dependent on how constant is load current.

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