A detection method for instrument constant test using standard meter method

Abstract

The invention provides a detection method for meter constant test by adopting the standard meter method, which includes connecting the standard meter with the electric energy meter under inspection; applying the reference voltage of the electric energy meter under inspection to the standard meter, and reading the current normal voltage The active total electric energy is used as the initial electric energy value; apply the maximum current of the tested electric energy meter to the standard meter, set the phase angle to 0°, and start the test after the power output of the standard meter is stable; accumulate the electric energy value of the standard meter, when When the accumulated electric energy value of the standard meter is within the preset range, adjust the phase angle according to the preset phase shift angle; continue 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 the preset standard travel threshold, read the detected The current total forward active energy of the electric energy meter is used as the termination electric energy value; calculate the difference between the termination electric energy value and the initial electric energy value of the electric energy meter under inspection, and calculate the error γ of the electric energy meter under inspection; if the γ does not exceed the basic error limit, it is pass, otherwise fail.

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 watt-hour 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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