自励源供电系统研究及应用

The Research and Application on System of Self-Excitation Power Supply

报告了一种直接从高压母线获取能量作为电子式电流互感器(ECT)工作电源的原理和实现方案,深入研究分析了自励源供电系统设计中的若干问题及应对策略和方法,成功地制造出了采用自励源供电系统的ECT并投入了实用,已被业界认可作为耐用的高压电器产品进入了电力市场。新型ECT的唤醒电流只有0.588 A,唤醒时间小于20 ms,借助本研究独创性的自励源磁场取能限流"漏斗"(一种特殊的限流组件),很好地解决了自励源供电的ECT工程实现中的关键技术难题:饱和大电流的冲击,加上一些特别的技术措施,使得自励源供电系统能为ECT的信号采样变送电路提供一个净化的直流电源,确保了ECT测量的精度。本研究所开发的自励源供电的ECT整机技术,简化了互感器的绝缘结构,使我国光隔离电子式电流互感器的技术实现了突破,提高了电力系统的综合自动化水平。

The paper introduces a principle and application of power supply that gets energy from high tension line for electronic current transformers （ECT）. Some problems of designing the new type of active ECT with self - excitation power supply and the relevant techniques and methods are fully studied. The ECT with self - excitation power supply has successfully created and put into practical. The wake - up current of the new ECT is only 0. 588 A and Wake - up time is less than 20 ms. The original restricting electrical current ＂funnel structure＂ （ a special restricting current component）is used to have solved key technology problems of impacting system by saturation large current. With some other special technical measures, self- excitation power supply can make sampling and transmitting circuit work in the purifying power and ensure measurement accuracy. The whole technology of creating the ECT with self - excitation power supply not only has simplified the structure of the ECT and also has achieved a major breakthrough in optical isolation ECT technology of china, that greatly lift the integrated automation level of power system. The new type of ECT has been approbated durable products and has entered the electric power market.