光电电压互感器的误差及误差抑制方法研究

Research on Error and Error Control of Optical Voltage Transformer

研究了基于电光效应原理的光电电压互感器的测量误差,分析了这些误差产生的各种原因,提出了抑制误差的各种方法。认为温度的变化会引起光功率和光波长的变化,同时引起光耦合效率的变化;电光晶体存在的自然双折射降低了光电互感器的温度稳定性;光纤的扰动会引起光功率的波动;电子元器件的噪声、温度特性以及电磁干扰增加了互感器的测量误差。通过提高LED的驱动电流、对传感器采取温控措施、选用低噪声高稳定性器件以及加强电磁干扰与防护设计可抑制测量误差。这些方法在实际中得到了应用,证明了方法的有效性。

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.