Figuring Out the Reactive Energy Measurement Method with Field & Lab Tests

[shehanshashika]

The digital CT (current transformer) operated energy meters are tested in field using consumer's load conditions by means of a parallel test equipment. It was observed that the reactive energy measurement has high accuracy mismatches on harmonic polluted loads. Some literature indicates that there are several different implementations of reactive energy measurement (Ex: Budeanu, Fryze, integral method, differential method etc.). However, the meter manufacturers do not provide details on their implementation.

I want to know whether it may be possible to figure out the implemented method using field measurements alone. If not, can anyone suggest a setup in laboratory conditions?

 

[anorlunda]

Welcome to PF.

I want to know whether it may be possible to figure out the implemented method using field measurements alone.

I'm not sure I understand your question. Do you want to reverse engineer the meter's method in the laboratory?

 

[berkeman]

Welcome to the PF.

The digital CT (current transformer) operated energy meters are tested in field using consumer's load conditions by means of a parallel test equipment. It was observed that the reactive energy measurement has high accuracy mismatches on harmonic polluted loads. Some literature indicates that there are several different implementations of reactive energy measurement (Ex: Budeanu, Fryze, integral method, differential method etc.). However, the meter manufacturers do not provide details on their implementation.

I want to know whether it may be possible to figure out the implemented method using field measurements alone. If not, can anyone suggest a setup in laboratory conditions?

Just read through the datasheets of some common commercial-grade electricity meter ICs. There are several industry-standard ICs on the market, and they should give pretty good explanations of the circuitry and algorithms used in their energy and Power Factor calculations...

Can you link to some of the metrology IC datasheets that you have been reading?

EDIT/ADD -- Have a look around the Microchip website. Here is one of their metrology ICs that we use in one of our metrology products...

https://www.microchip.com/wwwproducts/en/atm90e32as