Research Of Data Communication In The Electronic Current Transformer

Development of optic fibre technology,have promoted the research of electronic current transforme(rECT);The rise and ripeness of optic fiber communication technology,single-chip computer and DSP technology, make the development of ECT carry on practical stage.On the basis of the thing that the general principle,method of the optic fibre and fiber optic communication are analysed,combine the characteristic of ECT,this paper has put forward several kinds of different communication schemes,such as asynchronous communication, V/F-F/V convertor,digital encoding,etc.. And combine characteristic of harmonic current measurement in DC,the analogue communication of fibre optic has been applied to the harmonic current measuring system.Firstly,the essential photoelectric device of fiber optic communications,such as optic fibre,light source (electricity /light converter ),photoelectric converter and optic fibre connector,etc. is introduced. And has introduced the main technical parameter of every device in detail. Then the realization way and the application way in the ECT of fiber optic communication have been discussed.The way of light intensity modulating has been selected and been carried on the signal transmission between the high,low-voltage sides of system.The accuracy experiments indicates that this way can meet 5% of the accuracy of harmonic current measuring system.Finally,the paper carried on the discussion to the digital communication way of optic fibre,have developed the ECT in which a chip named ADE7759 is used as a digital integrator. It is proved by the accuracy experiments that the ECT can meet at 0.2 class in IEC 60044-8.