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Blondel's Theorem tells us that, to measure the total power of a three-phase load (balanced or unbalanced), we can use one less wattmeter than there are conductors supplying that load.

So the two-wattmeter method will work for anythree-phase load, provided there are only threeconductors supplying that load, e.g. three-wire delta or three-wire star (wye).

Bear in mind that wattmeter's read true power (expressed in watts) and ignores the reactive power of inductors and capacitors.

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9y ago

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