Measure Reactive Power

Can we measure reactive power by using only a single wattmeter? If Yes, How?

Questions by munish1983   answers by munish1983

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Vineeth Kartha

  • May 17th, 2012
 

Yes, we can measure reactive power using a single wattmeter. Connect current coil to one phase (let it be R of RYB) and connect pressure coil against the other two phases (Y and B) then W=VI Sin(phi)

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S.Ghosh

  • Jun 8th, 2012
 

Before answering the question let us think about the principal of measurement of reactive power. The reactive power is the power which is 90 deg apart from the real power. A wattmeter works on the principal of the interaction between the fluxes generated by its pressure coil and the current coil. The amount of force generated also depends on the angle between the two parameters, i.e. power factor angle. The wattmeter is calibrated in terms of cosine of power factor angle. The same meter can be calibrated in terms of sine of power factor angle and it will read reactive power. Another method to find reactive power is to measure voltage & current and subtract wattmeter reading from the product of V & I.

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Vinod kumar P

  • Feb 9th, 2015
 

Please give circuit diagram to measure reactive power with respect to 3-phase load.

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kvramana

  • Mar 14th, 2015
 

yes current coil of wattmeter connected in one phase and voltage coil is connected between remaining two phases then the wattmeter reads reactive power

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Gaurav

  • Oct 15th, 2015
 

Can you please explain elaborately?

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balkrushan Raghunath Kharse

  • Oct 25th, 2015
 

Why M and C terminal are not connected in Reactive Power measurement and voice-versa in active power measurement?

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merna eshak

  • Nov 11th, 2015
 

Of course we can do it! by just one watt meter.

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Vamsi Krishna

  • Feb 15th, 2017
 

Why single wattmeter is enough to measure 3 phase reactive power? Explain it elaborately.

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vki

  • Sep 7th, 2017
 

We can measure by connecting potential coils of two wattmeters between two phases

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