Energy Analyzers

Just a guess. The master analyzer always displays a higher number, right?

If the numbers don't match up could there be a distribution panel or machine you missed installing an "Energy Analyzer" on?

What is the reason for the "Energy Analyzers"?

Are you tripping a main circuit breaker?

More information is necessary to give you an intelligent answer!

analyzers are installed on every out going supply, also no circuit breaker is tripping,

Your outgoing feeders may have loads of different power factors. If you are measuring volt-amps, these loads will add vectorially, making the total appear smaller.

GIGO

The OP is requesting a specific answer to a specific question without specific data. Brilliant!

Maybe he does not know what accuracy and deviation are.

By verifying the current on each feeder is only a small part of the solution and anyway it won't give any meaningful data.

My opinion is that you have to rectify first your knowledge about energy measurement and then we'll have a common ground to start from.

I hope you'll get back, unlike many others that ask questions and then are gone.

i am measuring KWH, KWH reading of 24 hrs on main analyzer differs a lot in corresponding to sum of energy analyzers installed on outgoing feeders.

i have checked CT values and on CT and also in settings of analyzers, they are correct. also i have checked and the clamp meter amp reading and analyzer amp readings, they are both same, but at the end of day difference appears in KWH reading on main and sum of KWH readings of energy analyzers.

please tell me what specific data you need to help me out,

One last effort:

"at the end of day difference appears"

WHAT IS THE DIFFERENCE IN THE READINGS AT THE END OF THE DAY?????

Is the difference .5%, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%,10% or more????

If that's too difficult, maybe just print out the numbers themselves?

we need the data that "told" you your metering does not work right, raw data if possible, kWh values for master/slaves (or at least a percentage as Lyn said): kWh for master and slaves, TC ratio, rated burden and class (as RAM said it might be overloaded, wrong class etc). Also a diagram would help (engineers use these a lot if you haven't figured that out so far) to see where the CTs are placed aso.

Did this happen since commissioning of the metering system or the problem is recent? What happened (repairs, interventions) before the problem appeared.

Stop talking/writing about the clamp meter amp reading. It is useless. For this to be of any use you need the voltage also, and the power factor.

...and why does it only occur at the end of the day and not all the time?

Different by how much? What are their corresponding accuracy? Are they all calibrated? You need to fix this first then complain if there are discrepancies.

Removing the one on the incoming ACB will eliminate the problem.

This is hopeless.

We've tried...

thanks to all for adding thoughts to this problem , i found problem in wiring of Current transformer, changed its wiring, also i find that one machine named "stenter" when run, the difference increases. the CT wiring for that analyzer was not correct.

All the basic three parameters voltage current p.f . should be matching. For accurate results the individual current measuring element should operate at 40-100% loading. Accuracy class of all analyzers also matter.