自励源是一种电子式电流互感器高压侧自供电技术。介绍高压变电站采用全自励源电流互感器的设计原则和配置方法，阐述了应用于110 kV绵阳南塔变电站技术改进的过程和实际运行效果。运行结果表明：全自励源电子式电流互感器简化了系统结构，免于对送能装置的定期维护要求，提高了运行的稳定性，预期寿命周期由1~3年增长为15~20年，可大范围推广应用。

The self-excitation power supply is a self-power supply technology for electronic transformers at high voltage side. In this article, the design principles and configuration methods are introduced of adopting complete self-excitation power supply in high-voltage substation. A technical improvement process and actual operation effect are illustrated of 110 kV substation in Mianyang. It is shown that the application of complete self-excitation power supply transformers simplifies system structure, exempts from periodic maintenance requirements for power supply equipment, improves the stability of the operation. The expected service life increases from 1~3 years to 15~20 years. Therefore, it is worthwhile popularizing the power supply technology to a large scale.