Calibration system of digital quantity input type electric energy meter

Abstract

The invention provides a calibration system of a digital quantity input type electric energy meter. The problem of calibration of a novel digital quantity input type electric energy meter is solved. The calibration system of the digital quantity input type electric energy meter comprises an analog power source, high-accuracy PT and CT, a high-accuracy digital voltmeter, an A/D sampling module, a protocol generation module, a management module, an analog standard meter, an electric energy meter to be measured, an error counter and a control computer; the control computer controls the analog power source to output an analog voltage and current signal, and one path of the analog signal is measured by the analog standard meter and used for calculating the error of the meter to be measured; after the other path is converted by the high-accuracy PT and CT and processed by the AD sampling module and the protocol generation module, measurement data which conform to IEC61850 standard are generated and transmitted to the meter to be measured by an optical fiber or a twisted-pair, the meter to be measured receives and analyzes a data frame, the electric quantity is calculated, and the pulse of the electric quantity is output and used for calculating the error of the analog standard meter. The invention can calibrate an indoor digital quantity input type multi-functional electric energy meter which conforms to the protocols of DL/T860-9-1/2 and IEC61850-9-1/2LE, and a calibration result can trace to a national standard.

Description

technical field [0001] The invention belongs to an electric energy meter calibration system in the electrical instrumentation industry, relates to the technical fields of electric automatic measurement, electric energy measurement, computer communication, etc., and more specifically relates to a digital input type electric energy meter calibration system. Background technique [0002] With the application and popularization of the digital substation automation system based on DL / T 860 (IEC61850) standard, the information interaction between the substation process level equipment and the bay level equipment has undergone great changes. The application of process-level electronic transformers and intelligent primary equipment makes digital input energy meters an important equipment for digital substation energy measurement. Traditional electronic and inductive watt-hour meters are all analog input watt-hour meters, which are calibrated by higher-level analog input standard wat...

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Problems solved by technology

However, the energy meter calibration method and system introduced in this patent can only be applied to traditional ener

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