China's first highly reliable autonomous fiber optic current transformer passes technical appraisal

Recently, the Chinese Electrical Engineering Society organized from the electric power, optical and other fields of experts, China's first "highly reliable and independent fiber optic current transformer" for technical appraisal. Chen Weijiang, academician of the Chinese Academy of Sciences, as the representative of the industry experts agreed that the project to form a full range of optical current transformer equipment, representing the field of the highest international level of technology, to realize the field of science and technology in the field of self-reliance and innovation beyond the important significance.

　　For a long time, fiber optic current transformer and its core optoelectronic devices are mainly dependent on imports, and because of its face of extreme low temperature, external vibration, strong electromagnetic interference and other complex and harsh operating environment, the failure rate remains high, many times leading to DC blocking and stopping, and has become a constraint on the reliable operation of DC engineering problems.

　　State Grid Corporation, deputy director of the equipment department Guo Xianshan said, "fiber optic current transformer oil-free, gas-free, safe and environmentally friendly, fast response speed, dynamic range, has become the main direction of development of the current measurement in the power system, especially in the DC power transmission project has an irreplaceable role, and its reliability directly affects the safe and stable operation of the system. "

　　In response to the current situation of operational failures in recent years, the Chinese Academy of Electric Sciences, State Grid Jiangsu Electric Power Company composed of a team after more than ten years of technical research, breakthroughs in fiber-optic current transformer polarization optics analysis method and disturbance mechanism, wave piece integrated sensing fiber development process, the core of the reliability of optoelectronic devices to grow the test method, the operational status of intelligent monitoring and early warning technology and other core problems. Finally, successfully developed the first 100% fully localized high reliability independent fiber optic current transformer, temperature, vibration resistance and other key indicators of environmental weathering and reliability of the comprehensive improvement, and ± 800kV Qingnan converter station successfully network operation, marking China's complete solution to the field of optical current measurement of the "neck" The project team has accumulated a lot of experience in this process. In the process, the project team has published 19 standards, 46 invention patents, 49 papers and monographs, and 17 software copyrights.

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