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Watthour meter testing

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  1. Larry5443's Avatar
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    Watthour meter testing

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

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  3. gasman is offline Junior Member
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    Quote Originally Posted by Larry5443 View Post
    Does anyone a procedure for testing watthour meter or can explain how to test them
    https://www.usbr.gov/power/data/fist...10/vol3-10.pdf

    Check also

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

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    Quote Originally Posted by Larry5443 View Post
    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

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