Intelligent electric energy meter constant test system and test method thereof

Abstract

The invention discloses an intelligent electric energy meter constant test system. The system comprises a standard source, a standard meter, at least one detected electric energy meter, an error arithmetic unit and a communication interface. The system is characterized in that the standard source can arbitrarily set a voltage, a current and a power factor, provides a three-phase voltage for the standard meter and a detected voltage line and provides a three-phase current for a current line; a detected meter is connected in parallel to each phase of voltage line of the standard meter, and the electric energy meter is connected in series with each phase of current line of the standard meter; and the electric energy meter and the standard meter are connected to the error arithmetic unit through the communication interface respectively. In the invention, based on a traditional standard meter method, under a selected operation condition, the detected meter and the standard meter simultaneously operate for a period of time and electrical energy values of the two are compared so as to acquire an error of the detected electric energy meter; and according to a relation of the error and a basic error limit of the detected electric energy meter, whether a constant of the detected meter satisfies a requirement under the selected operation condition can be determined.

Description

technical field [0001] The invention belongs to the technical field of electric energy measurement, and in particular relates to an intelligent electric energy meter constant test system and a test method thereof. Background technique [0002] The constant of the smart electric energy meter is a numerical value representing the relationship between the electric energy recorded by the meter and the corresponding test output value. The measured cumulative electric energy is recorded by the counter, and the corresponding test output value can be output by the pulse output device. The number is calculated. According to the requirements of GB / T 17215.321, the relationship between the test output of the electric energy meter and the display indication should be consistent with the nameplate mark. [0003] At present, there are three kinds of constant test methods for smart electric energy meters: counting and reading pulse method, running word test method and standard meter metho...

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Problems solved by technology

[0004] Among them, the counting and reading pulse method requires that the electric energy value calculated by the output pulse number N and the electric energy meter constant C should be consistent with the recorded value of the meter, which has the disadvantage of poor operability; Among the tested watt-hour meters, two watt-hour meters with relatively stable errors and known constants are selected as reference tables, and the test results are easily affected by the error stability of the reference tables.

The traditional standard meter method is simple and easy to implement, but it is only tested under the conditions of reference frequency, reference voltage, maximum current and power factor of 1. The following also meets the requirements

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