Aiming at photoelectric current transformer technology, this paper analyses the principle of passive and active transformer firstly, then discusses the main technical difficulties in this area currently and the development of optical current transformer. We hope all above can play a reference role for related work. With the gradually deepen theory research on photoelectric current transformer technology in domestic and the continuous improving achievements acquired in practice, it's necessary

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... study the current status and development of photoelectric current transformer technology. The principle of passive photoelectric current transformer Passive type This type of transformer can be divided into two kinds based on the principle of the device of high pressure part of the sensor.One type is active,the other is passive.Compared with the active type,the sensing head of passive type doesn't need power supply.In general,it's designed based on the principle of Faraday magneto-optic effect . if the magnetic field direction keep in parallel with the direction of propagation of the linear polarized beam that is in the Faraday rotatory material,then the radiation polarization plane of the light will rotate.That is to say the magnetic field generated by current signal modulates polarization light-wave. Faraday magneto-optical effect