Optical Fiber Voltage Sensor With New Fiber Component And Optical Path Design

Optical Voltage Transformer (OVT) is a new kind of power transformer. OVT overcomes many drawbacks of traditional voltage transformer and can be widely used in power system in the near future. After years of development, it has formed a theoretical system. However, there are still some flaws and shortcomings. The main research object in the paper is the core of OVT, sensor probes, which is called Optical Voltage Sensor (OVS).In this paper, it first analyses the transmission of polarization light in the crystal and birefringence fiber, propose and analyses two different structures OVS. The first one is transmission OVS with quarter waveplate made by highly birefringence photonic crystal fiber and the second one is a new kind reflect voltage sensor without quarter waveplate. It analyses work principle of the two different structures OVS respectively, the effect of crystal intrinsic birefringence on OVS, and finally summarize the advantage of the two different structures OVS. Analysis indicate that OVS using optical quarter waveplate overcome the disadvantage of the traditional OVS, which is big and exist reflection when join with fiber. And the new-style OVS improve the reliability and sensitivity, it is more practicality. Meanwhile, more simple optical structure and less instruments reduce the unsteadily factors introduced by parts.In this paper, it also analyses the effect on OVS when output of quarter waveplate is not perfect circle polarized light, and it use a new signal process method firstly to compensate the effect on OVS which created by unfavorable factors. This way is practical for alternating voltage.At last, some experiment both about the temperature and polarization characteristics of the quarter waveplate and the properties of BGO have been done. These experiment showed that circularly polarized light can be produced by quarter waveplate (at 1555.5nm) when linearly polarized light is launched. It has good temperature characteristic. The BGO can be considered as the material without self-birefringence for higher extinction ratio. In addition, experiments about two the new-style OVS have been done. These experiment showed that the new-style OVS can measure the change of alternating voltage amplitude and has good linearity (at 500～1500 V).