March 16, the staff of the 1000 kV high voltage transformer test vehicle completed ± 800 kilovolt Xilu - Taizhou UHV DC Project Taizhou converter station 30 AC transfer test site handover.

This test vehicle is one of the achievements made by the State Grid Jiangsu Provincial Electric Power Company in completing the project "Research and Application of a Full Range of Power-frequency High Voltage Standard Devices". The project pioneered the method of tracing the frequency of high frequency and high frequency voltage based on the principle of voltage proportion and series addition of transformer voltage and developed the first 1000 kV high-precision series-mode high-frequency measurement standard device with frequency and invented a vehicle-mounted 1000 kV Transformer calibration device and GIS voltage transformer calibration system, to achieve a major breakthrough in the field of high voltage metering in our country. Recently, the project won the 2016 State Grid Corporation patent first prize and first prize of Jiangsu Province Science and Technology.

Based on innovation UHV measurement broken problem

Measuring the relationship between people's livelihood and the people's livelihood. "A series of national high-voltage power frequency standard equipment research and application of" one of the main finishers, State Grid Jiangsu Electric Power Research Institute, deputy director Yang Shihai said, "As the key electrical measurement standards, the national standard high-frequency voltage device is Uniform national power frequency high voltage value of the authority basis.High voltage measurement device measurement accuracy or not, relates to the power grid security and power generation, power supply, electricity trade tripartite trade settlement fairness and justice.

Yang Shiyi explained: "High-precision measurement technology is the need for trans-regional power transmission settlement.Generally, residents have hundreds of kilowatt-hours of electricity consumed per month in their homes, but the annual transmission capacity of UHV projects can reach tens of billions of kilowatt hours, Particularly important."

"However, before the implementation of this project, there are three problems in our country's high-voltage metering." According to introduction by Yang Shihai, the influence of insulation and structure on error significantly increases as the voltage level increases. The accuracy of the national standard measurement equipment developed by the traditional method is low. There is a technical gap in high-pressure national measurement standards. When conducting on-site testing of high-voltage metering devices, the traditional metering standard devices are subject to operating environment constraints, posing a big security risk and difficult to guarantee the accuracy of accurate measurement of high-voltage standard values ​​delivered to on-site metering devices.

How to measure the voltage safely, accurately and conveniently? Yang Shihai said: "Our innovation is mainly to find new ways to improve measurement accuracy, developed the highest level of metrology standards to the UHV grid assignment; to make an integrated device, will be scattered weighing dozens of tons of complex equipment Integrated into a test car. "

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