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Anonymous Poster #1

Energy Meter Reading Coefficient Factor

01/03/2016 12:24 PM

Dear Experts

What will the coefficient factor for a 3Ph energy meter which is designed for CT 400/5A but it is using with CT 150/5A?

And what will be the coefficient factor for a 3 Ph meter which is designed for CT150/5 but it is using with CT 400/5A?

Thanks & Regards
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lyn
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#1

Re: Energy Meter Reading cofficent factor

01/03/2016 12:54 PM

Depends on the ratio of garbage in to garbage out!

Algebraic Expressions - Jamesbrennan.org

ELECTRICITY METER READING

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Crabtree
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#2

Re: Energy Meter Reading cofficent factor

01/03/2016 1:35 PM

Experts? Here? X-spurt you mean. X is an unknown quantity and spurt is a drip under pressure.

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TonyS
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#5
In reply to #2

Re: Energy Meter Reading cofficent factor

01/03/2016 4:01 PM

X also equals a has been.

X wife (we'll not follow that path)

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Phys
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#10
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Re: Energy Meter Reading cofficent factor

01/04/2016 4:44 PM

Almost got it - that's an old joke and it goes:

Definition of expert - a has been drip under pressure.

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#3

Re: Energy Meter Reading cofficent factor

01/03/2016 2:05 PM

Exchange the CTs and skip the arithmetic?

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Rixter
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#4

Re: Energy Meter Reading cofficent factor

01/03/2016 2:20 PM

A power meter multiplies the current times the voltage to give power. Current is measured using current transformers (CTs). A current transformer converts the line current to a lower current which is fed to the power meter. CT 400/5A means that a line current of 400 Amps is converted to 5 Amps, a factor of 80:1. So you can do the math.

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TonyS
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#6

Re: Energy Meter Reading cofficent factor

01/03/2016 4:06 PM

Where did these experts come from? I thought this was an after hours drinking club.

OK, maybe that's where the ex-sperts came from.

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#7

Re: Energy Meter Reading cofficent factor

01/03/2016 4:43 PM

This information may be found by:

  • Looking in the instructions that came with the equipment
  • Ringing the equipment supplier's Technical Helpline
  • Looking on the equipment supplier's website

and in that order.

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HiTekRedNek
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#8

Re: Energy Meter Reading Coefficient Factor

01/04/2016 8:33 AM

We do not do math home work for elementary school students.

Ask someone with more advanced math skills;perhaps a 2nd grader to help you.

If not,go sit in the corner.

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#9

Re: Energy Meter Reading Coefficient Factor

01/04/2016 9:56 AM

Here is the first step to solving the equation:

400:5 CT => 80:1 => For every 80 amps of current flowing through the CT primary there will be 1 amp of current flowing through the secondary.

150:5 CT => 30:1 => For every 30 amps of current flowing through the CT primary there will be 1 amp of current flowing through the secondary.

400/150=>2.6667 (Metering error ratio caused by using a 150:5 CT instead of the required 400:5 CT.)

1) If meter reading is 120KW then 120KW x 2.6667 => correct/actual power reading

150/400=>.375 (Metering error ratio caused by using a 400:5 CT instead of the required 150:5 CT.)

Apply required math steps to solve equation.

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Crabtree (1); HiTekRedNek (1); lyn (1); Phys (1); PWSlack (1); Rixter (1); SHOCKHISCAN (1); TonyS (2); Tornado (1)

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