Watthour meter testing

[Larry5443]

Does anyone a procedure for testing watthour meter or can explain how to test them

[gasman]

Does anyone a procedure for testing watthour meter or can explain how to test them
https://www.usbr.gov/power/data/fist/fist3_10/vol3-10.pdf

Check also

http://www.radianresearch.com/media.php#manuals

[Realtime]

Does anyone a procedure for testing watthour meter or can explain how to test them

#1-If you have a dedicated Whr test set it is easiest.

#2-With a 3 Phase Relay Test set as a source and a separate reference meter will work well

#3 Omicron has equipment that works quite well with various adaptors to sense IR/LED pulse or KYZ from meter and does not need a separate reference.

#4 Old school, single phase "phantom load". A variac, large power resistor and reference meter.

#5 The Radian equipment is well respected and the price reflects that. There are certain very high accuracy class meters that will require a Radian.

You can rent all of the above equipment.

The tests are (from memory)

Full Load 100% Power Factor
50% Load 100% Power Factor
Light (10% of CT Sec) 100% Power Factor

Full Load 50% Power Factor
50% Load 50% Power Factor
Light (10% of CT Sec) 50% Power Factor

Typical Test Registers are 1.8

DUT pulses are compared after a certain duration. Calculate % difference = 100- (% difference)=% Registration