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GE 869 - Reactive Loads and Incorrect Metering

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    GE 869 - Reactive Loads and Incorrect Metering

    Hi everyone,

    Today I was working with an 869 relay which was metering incorrectly.

    The relay was monitoring a breaker and motor fed from a VFD. Although the current and voltage RMS values of the relay were metering correctly the instantaneous values were not.

    The motor was being tested with no load. Therefore, basically all the power was reactive with only some active power being supplied to compensate for mechanical losses.

    Can anyone describe why the relay would not meter correctly?

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