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Razi Zafar
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Join Date: Dec 2011
Posts: 3

Wattmetric Relay

12/14/2011 12:35 AM

What is wattmetric relay, how they work?

and where they can be used?

please share!
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lyn
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Join Date: Oct 2008
Posts: 42355
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#1

Re: Wattmetric Relay

12/14/2011 1:41 AM

It is a directional zero- sequence active power relay.
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Colorado-Bill
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Join Date: Nov 2012
Posts: 2
#5
In reply to #1

Re: Wattmetric Relay

11/15/2012 12:52 PM

I'm not familiar with a watt-metric relay (hence my query on the topic), but I'm pretty sure it would be a positive sequence element and not zero sequence.
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mandi
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India - Member - New Member Engineering Fields - Electrical Engineering - New Member Engineering Fields - Power Engineering - New Member

Join Date: Jun 2011
Location: Chennapattanam (Coromandel Coast of the Bay of Bengal).
Posts: 31
Good Answers: 1
#2

Re: Wattmetric Relay

12/14/2011 6:58 AM

DEFINITION
The wattmetric relay is a device which receives information on the voltage (V) and on the current(I), and calculates the cos φ value.

USE
An active power relay is typically used to check the active power absorbed by an electric motor which provides direct information on the load applied to that motor. Such information is more accurate than the one given by the current value. Actually, the cosφ variations can change the power values without affecting current values marked.
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PWSlack
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United Kingdom - Member - Indeterminate Engineering Fields - Control Engineering - New Member

Join Date: Jan 2007
Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain. Kettle's on.
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#3

Re: Wattmetric Relay

12/14/2011 7:12 AM

...then it can also be called a phase-angle relay.

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SolarEagle
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Join Date: Mar 2007
Location: by the beach in Florida
Posts: 33392
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#4

Re: Wattmetric Relay

12/14/2011 12:09 PM

It gives you a real time readout of motor load...

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Colorado-Bill
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Join Date: Nov 2012
Posts: 2
#6
In reply to #4

Re: Wattmetric Relay

11/15/2012 12:54 PM

I think you are referring to a wattmeter, not a watt-metric relay.
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Colorado-Bill (2); lyn (1); mandi (1); PWSlack (1); SolarEagle (1)

Previous in Forum: Cable Size Calculation   Next in Forum: What is the Maximum % Operating Load for a Particular Generator

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