Vibration Error Characteristic Analysis and Optimization Method Research on Fiber Optical Current Transformers

Abstract

The measurement performance of fiber-optical current transformers (FOCT) is affected by vibration interference. To solve this problem, the mathematical model of FOCT output signal is established, considering vibration effects on the Verdet constant and linear birefringence. The analysis shows that the greater the wavelength fluctuation and radial stress difference are, the larger operating error is. Using the finite element analysis method, the coupled solution of optical field and magnetic field verifies the vibration influence on the fiber output. Based on the theoretical analysis, some optimization methods are proposed including selecting an appropriate operating wavelength, using the optical fiber with better anti-interference performance and setting a reasonable installation environment.