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Anonymous Poster

doubt about wattmeter

08/06/2008 9:43 AM

in two watt meter method ,wattmeter have two coil upper one is small winding and lower one is large compare to upper one.,which one is moving and which one is fixed coil(upper one or lower one)????????
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PWSlack
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United Kingdom - Member - Indeterminate Engineering Fields - Control Engineering - New Member

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#1

Re: doubt about wattmeter

08/06/2008 10:31 AM

It would help the forum immeasurably if the make and model number of the wattmeter were available.

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Ron Nombri
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Engineering Fields - Electrical Engineering - Ron Nombri Engineering Fields - Energy Engineering - Ron Nombri Engineering Fields - Power Engineering - Eternal Power Papua New Guinea - Member - Ron Nombri

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#2

Re: doubt about wattmeter

08/06/2008 9:31 PM

You posted the same question on the:

Re: Two Wattmeter Method" by Guest on 08/06/2008 11:44 PM

Basically with Electrodynamometer Mechanism:

1. Moveable coil is connected in parallel with the load. It has a series resistor to it

which forms the potential element.

2. Stationary Coil is connected in series with the load. It is the current element

which carries the load current.

Large coil is the Stationary Coil and the Samll Coil is the Moveable Coil which is set inbetween the poles pf the larger coil.

The measurement technique works on the Electrodynamometer mechanism.

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Divyesh patel
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Join Date: Jul 2008
Posts: 37
#3

Re: doubt about wattmeter

08/06/2008 11:08 PM

hi

in wattmeter normally two coils are there

1 is pressure coil which is connected to the parallel to the supply voltage

2 is current coil which is connected in the series with load current

normally current coil is of heavy wires to withstand rated load current so it is very difficult to make current coil to move so in wattmeter moving coil is pressure coil and steady coil is current coil

regards

divyesh patel
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