Research On Signal Processing Unit Of Optical Voltage Transformer

As the development of economic construction, the electrical power industry is more significance. Economic construction of the nation, daily life of people, sableness and harmony of society are bound up with electrical power industry. Recently, as the upgrading of voltage class and the construction of Smart Grid, a novel transformer with high quarlity is imminently needed to instead of the conventional voltage transformer which will not satisfy voltage measurement in modern electrical power system.Optical voltage transformer(OVT) is a significant approach of electrical voltage transformer(EVT). Many countries have been down a great many study on it .What is more, there are serveral product has been developed and used in practice. On the base of these study, this thesis is dedecated to the reaserch of signal processing unit of OVT and has designed a noval system for signal processing and data acquisition.The structure and advantage of the noval optical voltage sensor(OVS) are analyzed base on the basic principle: Pockels effect. From IEC standards on EVTs, on the base of the noval OVS, two different kinds of schemes of signal processing has been introduced and compared in this thesis . Then the fittest one has been chosen as required. The mainly parts of the system—optic-electric conversion circuit, AC channel, DC channel, data acquisition system, interface of Merging Unit, light source—are analysed in detail and the system test has been down. What is more, study on several issues—such as the noise of optic-electric convension circuit, the sableness of some circuit unit when temperature changed and electro-magnetic compatibility are down also.Finally, the signal processing unit of OVT has been tested and the thesis put forward the issues to be further reasearch in signal processing unit of OVT .