Abstract
The power measurement mode has made fundamental changes with the development of smart substation, traditional energy metering analog devices are replaced by digital devices according to the requirements of digitalized information substation. Creating traceability between digital measuring value and analog measuring value and developing relevant calibration devices are key issues in smart substation construction. A new device for calibration digital energy meters using integral calibration technology is described in this paper. Based on the Standard Comparison Method, the device establishes a connection between the digital power and the traditional analog power with the integral calibration technology, and solves the problem that digital power was not able to be traced. The device is designed with final measuring voltage level: 220kV/110kV, measuring current range: 5A~5000A, and extended uncertainty less than 0.05%. Furthermore, the estimating process of the uncertainty of the device is discussed emphatically.
Highlights
Smart grid construction is an important field of growing concern in the world, and the smart substation is one of the important nodes in building smart grid, which bears electricity settlement gateway function and is an important guarantee for power efficient transmission and reliable operation of grid.Different from traditional substation, the communication platform of smart substation is established on the basis of IEC61850 international unified network communication standard [1,2]
Analog signals are transmitted by cable in the traditional power measurement mode, while digital signals are transmitted by fibre optic Ethernet in the digital power measurement mode, so the traditional calibration method and device cannot meet the requirement of digital electric energy metering system
Aiming at making the digital power be able to trace to the traditional power standard, this paper presents an integral calibration method by considering the digital electric energy measurement device as a whole, to avoid the problem that Electronic Transformer and Merging Unit can’t be calibrated separately, to calibrate the composite error of the whole set more comprehensively, and to reflect the performance of the whole set, including but not limited to network status
Summary
Smart grid construction is an important field of growing concern in the world, and the smart substation is one of the important nodes in building smart grid, which bears electricity settlement gateway function and is an important guarantee for power efficient transmission and reliable operation of grid. The electric energy metering device in smart substation contains Electronic Transformer, Merging Unit and Digital Input Electricity Meter, these components are fundamentally different from traditional ones just like traditional electromagnetic Transformer and Electricity Meter on the methods of measuring principle, and data transmission. Many scholars have made lots of related researches on calibration methods and traceability, and have come to many important conclusions [3,4,5,6,7] Most of these researches consider Electronic Transformer and Merging Unit as a whole for calibrating, while the Digital Input Electricity Meters are calibrated separately, there are not many studies by considering all digital electric energy measurement device as a whole [8,9,10], and are still not very mature. Aiming at making the digital power be able to trace to the traditional power standard, this paper presents an integral calibration method by considering the digital electric energy measurement device as a whole, to avoid the problem that Electronic Transformer and Merging Unit can’t be calibrated separately, to calibrate the composite error of the whole set more comprehensively, and to reflect the performance of the whole set, including but not limited to network status
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