Method and apparatus for checking global error of high voltage energy metering installation

Abstract

The invention relates to an overall error checking method and device of a high voltage electric energy metering device, wherein the device comprises a high-voltage heavy-current testing power source, a checking object, a testing power source stability degree control circuit, a monitoring unit and a benchmark electric energy measuring unit, wherein the high-voltage heavy-current testing power source is used to provide stable and reliable high-voltage heavy-current testing signal; the checking object, which is a high-voltage electric energy metering device, obtains the high-voltage heavy-current signal and generates detecting electric energy value; the testing power source stability degree control circuit is used to detect the amplitude and the phase of the voltage and the current of the high-voltage heavy-current testing signal; the monitoring unit sets needed detecting flow, testing voltage, current and power factor, and obtains the detecting result of the testing power source stability degree control circuit to control the output state of the high-voltage heavy-current testing power source; the benchmark electric energy measuring unit, which obtains the high-voltage heavy-current signal and generates a standard electric energy value, compares the standard electric energy value with the detecting electric energy value at the same time to obtain wattful or wattless electric energy measuring error.

Description

technical field [0001] The invention relates to a calibration technology of a power metering device, in particular to a method and device for checking the overall error of a high-voltage power metering device. Background technique [0002] The existing method for calibrating high-voltage electric energy metering devices is to detect each part of the device, including voltage transformers, current transformers, multi-function electric energy meters, and the voltage drop of the secondary line of the voltage transformer, to obtain the errors of each part, Then the measurement accuracy is controlled by the comprehensive error calculation method. However, the results of such theoretical calculations cannot calibrate the overall error accuracy of the metering device, and there is no direct detection method to determine the overall metering accuracy of the high-voltage electric energy metering device. At the same time, with the emergence of high-voltage electric energy meters, thi...

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Problems solved by technology

However, the result of theoretical calculation in this way cannot calibrate the overall error accuracy of the metering device, and there is no direct detection method to determine the overall metering accuracy of the high-voltage electric energy metering device

At the same time, with the emergence of high-voltage electric energy meters, this new type of high-voltage metering device adopts the design of integrating the transformer and electric energy meter, and can only be verified by the method of high-voltage overall calibration.

However, there is currently no method for overall calibration of high-voltage electric energy metering devices.

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