Detection method for instrument constant test by adopting standard meter method

Abstract

The invention provides a detection method for an instrument constant test by adopting a standard meter method. The detection method comprises the following steps of connecting a standard meter with adetected electric energy meter, applying reference voltage of the detected electric energy meter to the standard meter, and reading current forward active total electric energy of the detected electric energy meter as an initial electric energy value, applying the maximum current of the detected electric energy meter to the standard meter, setting a phase angle to be 0 degree, and starting the test after the power output of the standard meter is stable, accumulating the electric energy value of the standard meter, and when the accumulated electric energy value of the standard meter is within apreset range, adjusting the phase angle according to a preset phase shift angle, continuing to accumulate the electric energy value of the standard meter, and when the accumulated electric energy value of the standard meter is not less than a preset standard travel threshold, reading the current forward active total electric energy of the detected electric energy meter as a termination electric energy value, calculating the difference between the final electric energy value and the initial electric energy value of the detected electric energy meter, and calculating the error gamma of the detected electric energy meter, and judging qualification if gamma does not exceed the basic error limit, or otherwise, judging disqualification.

Description

technical field [0001] The invention relates to a detection method for an instrument constant test, in particular to a detection method for an instrument constant test using a standard meter method. Background technique [0002] [Instrument constant test] is a testing item required by the National Metrology Verification Regulations JJG596-2012. There are three implementation methods for this test, among which [standard meter method] is the most commonly used detection method for [instrument constant test]. [0003] The test requires that, under the conditions of reference voltage, maximum current and cosφ(sinφ)=1, run for a period of time, after stopping the operation, press The formula calculates the error γ of each watt-hour meter to be tested, and it is required that γ does not exceed the basic error limit; among them, γ0: the established system error of the standard meter, γ0=0 when no correction is required; W': each watt-hour meter to be tested stops The difference b...

AI Technical Summary

Problems solved by technology

Take the single-phase electric energy meter as an example, the nameplate parameter voltage is 220V, and the current is 5 (60)A. According to the test requirements, the power of the standard meter at this time is 13200W. 2.7 seconds, coupled with the influence of other objective environments, such as command transmission time, standard meter voltage, slow rise and fall of current output and other factors, the cumulative value of the standard meter electric energy value often exceeds the set standard travel threshold, so It will affect the test results of the [instrument constant test] through the [standard table method], resulting in inaccurate judgment of the test conclusion

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