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Join Date: Apr 2016
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Meter Multiplier

04/21/2016 2:20 AM

This is the meter, can any one help me calculate the multiplier

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Guru
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#1

Re: Meter Multiplier

04/21/2016 3:10 AM

What multiplier? Will anyone do?

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#2

Re: Meter Multiplier

04/21/2016 3:41 AM

You get Wh (Watt Hour) when multiplying with 1000.

Multiply the difference over time with the price per Kilo watt hour (kWh) and you get your cost.

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#4
In reply to #2

Re: Meter Multiplier

04/21/2016 4:59 AM

The display is in kWh.

Its has revolutions per kWh on the display.

Check this

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#3

Re: Meter Multiplier

04/21/2016 4:33 AM

You need to state what the ratios are of the current and potential transformers feeding this meter. However, it looks as though someone has already handwritten the answer above the meter. Whether or not correct is anybody's guess.

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#5
In reply to #3

Re: Meter Multiplier

04/21/2016 6:23 AM

Yes, someone did and it's at 25,000 however when I try to calculate using 25000 as the multiplier, I can't get the right figure. The unit is generating 12 MW so logically when you calculate using the 25000 multiplier you will also get 12MW however it's only when you calculate it using 120000 as the multiplier.

I know the CT*VT = multiplier formula but if there is any other formula using Rev/kWh? or is the VT = 3 x 64/110V? or 11000/100V? since it is a generating 12MW at 11kV and then step up to 33kV.

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#6
In reply to #5

Re: Meter Multiplier

04/21/2016 7:16 AM

Then 120000 is the correct figure and 25000 is incorrect. Is there something here that is not obvious (rhetorical question - NNTR)?

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#7
In reply to #6

Re: Meter Multiplier

04/21/2016 9:28 PM

True enough, just making sure that im not missing any formula with this type of meter.

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#8

Re: Meter Multiplier

04/21/2016 11:13 PM

In the measurement you provided, the amount of power is miniscule. (50 Watt/hour in 30 minutes?) No wonder the CT does not read accurately, they are not designed to at that tiny power level. Have a look at e.g. ( or Google "current transformer linearity")

http://store.gedigitalenergy.com/faq/documents/489/get-8402.pdf

Some thing about Magnetizing impedance :)

Sorry I do not work in the field anymore, but hope it helps.

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