Research Of The Active Electronic Compensation Based On Self-Adaptive Theory Of The Current Transducer

The active compensation method of current transducer based on adaptive theory is thetopic of the thesis. Its purpose is to realize the looped measure, improve precision andbroaden measure arrange.The theory basic of this paper is the induction of extracting exciting current and theinduction of self-adaptive gain module.In this method, the similar inductance is used to extract the excitation current of CT,which, through some electronic circuits, turns into proper compensation current and isinjected into the compensation winding. This current replaces the exciting current, sothe error is reduced. The adaptive control is adopted to trace the error, and thecompensation current is adjusted according to it, so the error will always keep low.That is very useful for the load, which changes frequently and in a wide range.The PCB designed with Protel99SE, is more convenient and reliable than the circuiton the bread board. That will be for the latter research.A virtual checkout instrument and harmonic analyzer instrument based on Lab VIEWis developed. It is easy to develop and very convenient, economic. A great deal ofwork about data record is simplified. Some capital is saved also.The harmonic is also discussed in the thesis. It is expected to get from the main core,and receives some effect.The method designed by the author achieves good effect, improving the precision ofCT from 0.5 to 0.1. And the idea of measuring the harmonic directly is partly verified.