China develops the first high-voltage energy metering standard

Recently, the “Eleventh Five-Year” National Science and Technology Support Plan project “Key Technology Research on High-Voltage Energy Measurement Standards and Value Traceability” led by the China Measurement Institute successfully passed the inspection and acceptance by the AQSIQ. For the first time, the research group has established 10kV, 35kV, 110kV high-voltage energy measurement standard devices and on-site calibration devices in the world, and took the lead in the field of electrical energy measurement field calibration practice on the high-voltage power grid, making China become the world's first successful development of high-voltage energy measurement Standards and countries that have successfully mastered on-site calibration techniques for high-voltage grid energy metering.

In recent years, with the increasing importance of energy saving and emission reduction and resource conservation in various countries in the world, coupled with the reform of China's power industry system, it is proposed to establish a highly integrated sensor technology, communication technology, computer technology, measurement and control technology and traditional physical power grid technology. Smart grids make high-voltage energy metering the key and focus of building a national energy metering system.

At present, high-voltage electric energy measurement and measurement devices in various countries in the world cannot perform overall measurement verification/calibration and traceability, and there are problems such as theft of electricity cannot be monitored and measurement is inaccurate. The main reason is that it has not broken through the original traditional transformer technology, and it is difficult to develop a standard device that can simulate a standard power grid. Among them, the greatest difficulty lies in the need for original innovation to develop high-voltage, high-current standard power sources that can output high accuracy.

In order to solve the above difficulties, researchers from the China Institute of Metrology began research and exploration in this area in 2004. After nearly 10 years of hard work and joint research in the past three years, the research group has innovatively proposed the concepts of I/V, V/V and high-voltage “safe virtual ground” and successfully developed 10kV, 35kV, 110kV/1000A. High-voltage energy metering standard equipment (with an accuracy of 0.02%) and safety virtual ground three-phase four-wire 10kV, 35kV, 110kV high-voltage energy field calibration device (with an accuracy of 0.2%), solving the problem of high-voltage energy metering equipment according to the actual power grid The indoor verification of parameters and the on-line overall verification/calibration of electrical energy measurement equipment (power metering cabinets, etc.) under high-voltage actual environmental conditions fundamentally solve the problem of high-voltage energy metering to achieve a revolutionary change in high-voltage energy metering.

According to the project leader and director of the Institute of Engineering, China Institute of Metrology Zheng Zhi, introduced, based on high-voltage energy measurement site calibration device, also put forward the establishment of smart metering power grid technology program. Taking this technical solution as the basis of the smart metering system (AMI) in the smart grid construction, it can not only solve the problem of accurate online electricity measurement in China, but also can realize real-time monitoring of the entire grid: real-time tracking of each degree of electricity. The grid loss on each branch road and the measurement error of each meter at the end of the grid can be grasped at any time and at any place; any branch, any point of theft, or leakage problem can be found at any time. It is of great significance to strengthen national power grid management, save and rationally use electric energy, and ensure the safety of China's power grids.