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

In summary, the conversation discusses the testing of digital CT operated energy meters in the field and the observed accuracy mismatches in reactive energy measurement on harmonic polluted loads. It is mentioned that there are various implementations of reactive energy measurement, but meter manufacturers do not disclose their specific method. The question is raised if it is possible to determine the method using field measurements alone, and if not, suggestions for laboratory setup are requested. The response suggests reading datasheets of common commercial-grade electricity meter ICs, including those from Microchip, to gain insight into circuitry and algorithms used in energy and Power Factor calculations.
  • #1
shehanshashika
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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?
 
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  • #2
Welcome to PF.

shehanshashika said:
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?
 
  • #3
Welcome to the PF. :smile:

shehanshashika said:
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
241243
 
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Related to Figuring Out the Reactive Energy Measurement Method with Field & Lab Tests

1. What is the purpose of using field and lab tests to figure out the reactive energy measurement method?

The purpose of using both field and lab tests is to accurately measure the reactive energy in a system and determine the most efficient method for its measurement. Field tests involve collecting data from the actual system in real-world conditions, while lab tests allow for controlled experiments to be conducted to validate the results from the field tests.

2. How do field and lab tests differ in terms of data collection?

Field tests involve collecting data from the actual system in real-world conditions, which can be influenced by external factors such as weather and other variables. Lab tests, on the other hand, allow for controlled experiments to be conducted in a controlled environment, which can provide more accurate and consistent data.

3. What are the key factors to consider when conducting field and lab tests for reactive energy measurement?

When conducting field and lab tests for reactive energy measurement, it is important to consider factors such as the type of system being tested, the location and environment of the system, the equipment used, and the accuracy and precision of the measurement methods.

4. How can the results from field and lab tests be used to determine the most effective reactive energy measurement method?

The results from field and lab tests can be compared and analyzed to determine the most effective reactive energy measurement method. Factors such as accuracy, precision, and cost can be considered to determine which method is the most suitable for the specific system being tested.

5. Are there any limitations to using field and lab tests for reactive energy measurement?

While field and lab tests can provide valuable data for determining the reactive energy measurement method, there are some limitations to consider. Field tests may be influenced by external factors, and lab tests may not accurately reflect real-world conditions. It is important to carefully analyze and interpret the results from both types of tests to ensure the most accurate and reliable conclusions are drawn.

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