中文摘要：

光电电流互感器（简称0ECT）在电力系统中具有广泛的应用前景，但为其高压端供能的电源是研究的难点．一直制约着有源电流互感器（CT）的应用。在此，设计了一种改进的供电方案——交直流结合供电方案．即小CT母线电流取能和储能电池相结合供电。介绍了该方案的供能原理，并进行了具体的设计和实验。实验证明，该电源方案能在母线电流很小或断电的情况下为高压端提供不小于540mW的功率，而且能在大电流情况下，提供稳定电压，保护后续变换电路，有效解决了母线取能供电存在的技术难点。

英文摘要：

The optical current transformer has the widespread application prospect in the electric power system, its power source in high-voltage side is difficuh in the research,which has been restricting the application of the active current transformer.In this design, an improved power supply method is proposed,which adopts the power supply mode of the combination of the line with the battery stored energy.The principle for this supply power is introduced.The idiographic design and experiment are carried out.The experimental results show that the circuit of power can supply about 540 mW for high voltage side,when the current is small or zero.It can also provide the stabile voltage and protect the circuit at the back,when the current in line is large.The difficulties are solved in the power induced from line by CT.