The basic principles of FOCT are introduced. The technology of anti-vibration, temperature adaptability and long-term stability are described, and the main solutions are given. Performance testing and application in China are summarized. The integrated installation method of FOCT and high voltage equipment, such as GIS, DCB, is put forward. Integrated equipment will be used for the construction of a new generation intelligent substation. The problems in the application of FOCT in electric energy measurement and relay protection are analyzed. A double sampling technique is proposed to meet the requirements of relay protection. At last, the development and application in the future are prospected.%介绍了全光纤电流互感器(FOCT)的基础技术原理。阐述了FOCT的抗振动干扰技术、高低温环境适应性、长期稳定性等实用化关键技术，并给出其主要解决途径。总结了FOCT性能检测情况及在国内的应用现状，提出FOCT与GIS、DCB等一次设备的集成安装方式，集成设备将用于新一代智能变电站的建设。分析了FOCT在电能计量、继电保护等应用中的问题，提出一种满足继电保护要求的双采样技术方案。最后，对FOCT的未来技术发展及应用前景进行展望。
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