Measuring 3 Phase Power Using Wattmeter Methods

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Discussion Overview

The discussion revolves around measuring three-phase power using wattmeter methods, specifically the two and three wattmeter techniques. Participants seek clarification on how these methods function and their applications in different scenarios.

Discussion Character

  • Exploratory
  • Technical explanation
  • Homework-related

Main Points Raised

  • One participant asks for an explanation of the two and three wattmeter methods for measuring three-phase power.
  • Another participant suggests that if the phases are balanced and the power factor is 1, one could measure the amperage across one phase and the voltage between two phases, although there is uncertainty about whether it should be phase to ground.
  • The same participant notes that if the phases are not balanced, it may be necessary to measure each phase's amperage and the voltage between each phase.
  • A participant shares a link to a wattmeter manual that includes different wiring configurations, indicating a desire to provide additional resources for understanding.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the specifics of the wattmeter methods, and there are varying levels of understanding regarding the configurations and conditions under which different measurements apply.

Contextual Notes

There are limitations regarding the assumptions made about phase balance and power factor, as well as the specific wiring configurations that may not be fully resolved in the discussion.

Who May Find This Useful

Individuals interested in electrical engineering, particularly those studying power measurement techniques in three-phase systems, may find this discussion relevant.

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Hi all,

3 phase power is measured using 2 and 3 wattmeter methods.Correct?
can someone explain how these 2 work?I cudn get enuf info on it.
 
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This might be helpful.

Regards
 
hey dlgoff

thanx a lot.i shall look into each link and hopefully find what i am loking for and more.
Thanx a loooooot!
 
It depends: if the phases are balanced and the power facter is 1, you could measure the amperage across one phase and voltage between two of them (I think - it might be phase to ground, though). If they aren't, you can measure each phase's amperage and each phase to phase voltage. There's probably a shortcut to that, but I don't remember it. Lemme see if I can dig up a wattmeter wiring diagram...

http://www.amprobe.com/manuals/ampKilowattHourMeter.pdf is a manual for a wattmeter showing different wiring configurations...

I'm a little thin on the different configurations of 3 phase power...
 
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thanx a lot russ,i really needed this.
:smile:
 

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