有源电子式电压互感器高压侧供电方案研究

摘要

Aiming at the capacitor voltage transformer in high voltage side of the power supply, a new method was proposed, combined power supplying method of obtaining power from the main power line by a small CT and by a capacitive voltage divider in parallel with the PT, to supply power for electronic voltage transformers with source. Its structure, principle, syntony and the mechanism of energy transfering were analyzed, as well as the influences of the auxiliary power to the EVTs accuracy and reliability of the work. The results indicate that the method has good feasibility through the experimental simulation, and can efficiently solve the technical difficulties to attain the energy from the buses.%针对电容分压式电压互感器高压端的电源问题,提出了“在高压端以母线小CT供电为主,利用电子式电压互感器(EVT)高压电容器电容分压与PT并联取能为辅”,给有源电子式电压互感器高压端供电的新方法,重点研究分析了其结构、原理、谐振和能量传变机理,以及辅助电源对EVT的精度与工作可靠性的影响,并通过实验进行了仿真验证.实验结果表明,该方案具有很好的可行性,可以有效地解决母线取能存在的技术难点.