Abstract
As one of the most important measurement equipment of the intelligent substation, digital electric energy meter fundamentally resolved the technical bottleneck of traditional substation. During the operation process, measurement accuracy and reliability are related to the safe and stable operation of power system. Based on the literatures related to the digital electric energy meter, this paper introduced the concept of digital meter, analyzed the error sources, and summarized its development status and the existing calibration method. The paper studied the calibration system based on IEC61850-9 and provided an accurate and safe application method for digital electric energy meter.
Highlights
Compared with the traditional electric energy meter, working principle and interface mode of digital electric energy meter have been changed fundamentally
Because there is no single standard of digital electric energy meter calibration, 347 digital substations all over the country that use digital electric energy meter are operating without complete test or the measuring accuracy cannot be guaranteed
Referring to the problems that occurred during the application of digital electric energy meter, research shows that the following points should be considered for high-precision: the measurement accuracy of the digital electric energy meter in the multi unit data packets, the measurement accuracy in different sampling ratio, the measurement accuracy at 0.01% Packet-loss Ratio, and the digital electric energy meter should keep the same level of accuracy when change the voltage and current specifications
Summary
Compared with the traditional electric energy meter, working principle and interface mode of digital electric energy meter have been changed fundamentally. Most people have inherited the ideas of traditional instrument measurement, calibration parameters, calibration method, provision of technical indicators and so on[1], which has demanded new requirements for the calibration of the digital power meter. Its development has experienced induction type (mechanical), pulse type (electromechanical) electric energy meter and electronic energy meter etc[2]. With the advancements of intelligent substation[3] digitized standards, its corresponding technology, and the continuous development of the digital and network measurement mode, digital multifunctional electric meter based on IEC61850 has been widely used and become the development trend of the smart grid. Because there is no single standard of digital electric energy meter calibration, 347 digital substations all over the country that use digital electric energy meter are operating without complete test or the measuring accuracy cannot be guaranteed. This paper provided a variety of ideas for realizing high precision in the current verification technology
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