Research on Error and Error Control of Optical Voltage Transformer
LI Kai-chen · Electrical Measurement & Instrumentation · 2013
The paper studies the measurement errors of optical voltage transformer based on electro-optical effect,analyzes the reasons of the errors, and puts forward effective methods to control the errors. The change of temperature will cause the change of light power and light wavelength, and simultaneously cause the change of light coupling efficiency. The natural birefringence of the electro-optical crystal will lower temperature stability of the voltage transformer. The perturbation of optical fiber will cause the fluctuation of light power, and the noises and temperature characteristics of electronic elements and electromagnetic interference will contribute to the errors of the voltage transformer. Increasing LED driving current, controlling the temperature of the transducer, choosing the elements with low noise and high performance, and taking the design of anti-electromagnetic interference can effectively control and reject the errors. These methods have been applied to practical optical voltage transformer design with proved effectiveness.