Method and system for calculating metering error of electric energy meter

Abstract

The invention discloses a method for calculating a metering error of an electric energy meter. The method comprises the following steps: controlling a three-phase power source to generate three analog voltage signals and three analog current signals according to set test point requirements; setting the proportion of a three-phase AC proportion standard, and converting the voltage signals and the current signals into six voltage small signals; synchronously performing data collection on the six voltage small signals by using 6 high-precision voltage samplers and on output pulses of a to-be-tested electric energy meter by using a universal counter; calculating a standard electric energy value according to data collected by the 6 high-precision voltage samplers, and calculating an electric energy value of the to-be-tested electric energy meter according to the data collected by the universal counter; and calculating the metering error of the to-be-tested electric energy meter according to the standard electric energy value and the electric energy value of the to-be-tested electric energy meter. According to the method disclosed by the invention, the same path of voltage small signals is collected by using the high-precision voltage samplers and the to-be-tested electric energy meter, the error of a standard signal converter is not introduced, and the accurate measurement of the metering error of the electric energy meter can be realized.

Description

Technical field [0001] The present invention relates to the field of electric energy meter measurement, and more specifically, to a method and system for calculating the measurement error of a static electric energy meter connected via an electronic transformer. Background technique [0002] With the maturity of electronic transformer technology, electronic transformers have been widely used in 10-35kV distribution networks. The secondary output of electronic transformers conforms to the national standard GB / T 20840.7 for electronic voltage transformers and electronic The digital quantity or analog small signal quantity of the current transformer national standard GB / T 20840.8, the output mode of the analog small signal is mainly used in the distribution network. [0003] Different from traditional transformers that output 100V / 5A voltage and current signals, analog small-signal output electronic transformers, whether they are voltage transformers or current transformers, whose sec...

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Problems solved by technology

[0006] The invention provides a method and system for calculating the measurement error of a static electric energy meter connected through an electronic transformer, so as to solve the current problem that the electric energy meter cannot be accurately measured by analog small signal input

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