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mukeshkumar5609
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How to Identify 3 Phase Energy Meter Multiply Factor

05/03/2017 1:50 AM

Dear Sir, we are using 3 phase 4wire energy meter on 11 kv panel. Meter details is following- /110/√3, /1A, 50 Hz, Ib:1A, Imax:2A, Cl-.2s, 160 pulse/wh, Make-Secure.

PT which we r using is 11kv/110/√3 and CT ratio is 1000/1A

what will be the multiply factor formula to calculate Kwh reading.What will we multiply in the Difference of kwh reading.

Kindly guide me

removed bold - CR4 Admin

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Crabtree
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#1

Re: How identify 3 phase energy meter Multiply Factor

05/03/2017 1:55 AM

One of the things we can do is to read the literature that came with it. Another thing we can do is use the telephone to speak to someone at the equipment manufacturer's premises.

I say we, but I'm not going to do it for you, because that might make you lazy and we don't want that, do we?

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Tornado
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#2

Re: How identify 3 phase energy meter Multiply Factor

05/03/2017 1:58 AM

Boldface is a form of shouting. Please refrain from that.

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Crabtree
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#3
In reply to #2

Re: How identify 3 phase energy meter Multiply Factor

05/03/2017 2:01 AM

That too.

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Ivanov327950
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#6
In reply to #2

Re: How identify 3 phase energy meter Multiply Factor

05/04/2017 1:23 AM

What is the meaning of removed bold. Banned user? Is it supposed to be because of this thread? Or because of his IP address?

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Tornado
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#7
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Re: How identify 3 phase energy meter Multiply Factor

05/04/2017 2:00 AM

"Removed bold" just means that the boldface format was set back to normal face. Ordinarily this would not be enough reason to ban a poster, unless the practice was repeated after warnings.

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James Stewart
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#8
In reply to #7

Re: How identify 3 phase energy meter Multiply Factor

05/04/2017 11:49 AM

While that is true, it is akin to banning a comedian for making off color jokes.

I thought that is what comedians are supposed to do, you, you, coke holster.

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Anonymous Poster #1
#14
In reply to #7

Re: How identify 3 phase energy meter Multiply Factor

05/08/2017 3:49 PM

I type in bold because I am hard of hearing.

(No, that's insensitive to people who actually HAVE hearing difficulties.)

My inner voice is always shouting to drown out the other voices in my head.

(No, that's disrespectful to the mentally ill.)

My previous job was in the Army! Artillery corps! Why do you ask?!

(Can't beat a callback to Good Morning Vietnam. Robin Williams was in good form in that film. Still miss him.)
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James Stewart
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#15
In reply to #14

Re: How identify 3 phase energy meter Multiply Factor

05/08/2017 4:12 PM

Why do you look like that today AP#1? Why are you wearing a burka?

Oh, now you are going to tell me I am being insensitive to burkas?

By the way, what were you shouting? I could not find it in the other noise, because I am actually hard of hearing.

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Tornado
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#4

Re: How identify 3 phase energy meter Multiply Factor

05/03/2017 3:13 AM

Oh to be a power vendor to somebody who doesn't know when (or when not) to multiply by √3.

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James Stewart
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#5

Re: How to Identify 3 Phase Energy Meter Multiply Factor

05/03/2017 9:36 AM

Basically, your XFRMR is likely wired up Star->Delta secondary. Apparently your meter has a pulse output for every 1/160 Whr (Watt-hr). Thus 1 KWhr will cause the meter to output a total of 160,000 pulses (44.444...Hz). Typically, in Delta mode the voltage phase-phase is the same each phase (for obvious reasons), and the current is √3 the phase current, for whatever part of the system is using 3-phase.

It appears now, however, that you are using one phase of a star system, hence the √3 divisor on the voltage ratio.

I believe your meter is already configured to output the number of KWhr's as a pulse train with a variable frequency of pulses, up to some limit of speed. It seems like an odd way, what is the rated top power input to be measured by such a meter? 220-300 Watts?

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James Stewart
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#13
In reply to #5

Re: How to Identify 3 Phase Energy Meter Multiply Factor

05/05/2017 1:25 PM

How come my thoughts were considered to be off-topic? You just don't like the answer I gave.

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rwilliams
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#9

Re: How to Identify 3 Phase Energy Meter Multiply Factor

05/04/2017 2:41 PM

Since the meter ratios match your CT & PT ratios, the primary kWh are your line CT current 1000A x Line to Line PT voltage 11,000, or called meter multiplier. Your meter multiplier is 11,000 kW.

If you see 1 ampere of secondary current, and 110 volts line to line, your secondary power is 1A x Sqrt3 x 110V = 190.526 watts 3 phase, the meter measures only real power.

So your primary power then is 1000A x Sqrt3 x 11,000 = 19052.6 kW
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rwilliams
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#11
In reply to #9

Re: How to Identify 3 Phase Energy Meter Multiply Factor

05/05/2017 11:29 AM

My mistake, multiplier is ratio times ratio, as shown below by 7anoter4
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7anoter4
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#12
In reply to #11

Re: How to Identify 3 Phase Energy Meter Multiply Factor

05/05/2017 12:58 PM

Don't be so upset, it's not such a big mistake. However in the o.p. data was not so clear.

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7anoter4
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#10

Re: How to Identify 3 Phase Energy Meter Multiply Factor

05/05/2017 2:32 AM

Let's say the energy meter rated voltage is 110 V phase-to-phase [or 110/sqrt(3)=63.5 V phase-to-neutral]. The PT secondary rated voltage is also 110 V phase-to-phase. Then the transformer ratio is 11000/110=100.

Let's say the energy meter rated current is 1 A per phase. [Since SafetyFactor=2 for measuring winding Imax=2 A].However, the rated is still 1 A.

The CT ratio is 1000/1=1000. Then the multiplying constant will be 100*1000=100000=10^5.

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