"Research on State Evaluation Technology of All-fiber Current Transformer" passed the acceptance test
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On August 17, the China Electric Power Research Institute successfully completed the acceptance of the "All-Fiber Current Transformer State Evaluation Technology Research" project, a key science and technology initiative under the State Grid Corporation. The project was organized by the Ministry of Science and Technology of the State Grid and marked a significant step forward in the development of advanced current sensing technologies.
As a critical component in high-voltage power grid monitoring, current transformers play a vital role in both electric energy measurement and relay protection systems. With the rapid advancement of smart grids and ultra-high voltage (UHV) transmission networks, traditional electromagnetic current transformers have shown limitations, such as poor accuracy and susceptibility to interference. In response, all-fiber current transformers have gained increasing attention due to their superior performance characteristics.
These modern devices offer high measurement accuracy, wide dynamic range, fast frequency response, excellent anti-electromagnetic interference capabilities, compact size, lightweight design, and the ability to measure both AC and DC signals. However, a major challenge remains: the photovoltaic modules used in these transformers account for over 70% of the total cost. Currently, the specialized optical fiber materials required for these modules are dominated by foreign manufacturers, leading to a heavy reliance on imported components.
In 2014, Beijing Yiguang Research Institute and Beijing Shiweitong Technology Development Co., Ltd. collaborated to develop high-precision photoelectric modules for current measurement. After two years of joint research, they achieved remarkable progress, creating low-birefringence fibers with full intellectual property rights. This breakthrough broke the foreign monopoly and significantly improved the temperature error performance of all-fiber current transformers.
Today, as smart substations continue to evolve, all-fiber current transformers face new challenges. Researchers from the Chinese Academy of Electric Power have developed an optical path and circuit system that considers the temperature and driving current of the light source. This innovation addresses the urgent need for enhanced reliability, stability, and accuracy in next-generation intelligent substations.
Through in-depth analysis of key parameters affecting overall performance, they proposed a self-diagnostic technology model and a comprehensive set of methods based on light source die temperature, driving current, and other optical and electrical parameters. As a result, an all-fiber current transformer with self-diagnosis capabilities for GIS systems has been developed.
The successful completion of this project is expected to significantly enhance the technical level of the fiber optic current transformer industry in China, supporting the country's transition toward smarter and more efficient power systems.
(Sources: China Electric Power Research Institute, China Machinery Network, Beijing Municipal Science and Technology Commission)