Abstract
The straight-through magneto-optical glass current sensor has desirable temperature properties, but it is vulnerable to magnetic interference. In contrast, a polarization-type fiber optic current sensor has poor temperature performance, but the magnetic anti-interference characteristic is very good. Aiming at the problem that the accuracy of a fiber optic current sensor is susceptible to external disturbances and temperature fluctuations, we present an adaptive technology of a fiber optic current sensor that uses the magneto-optical output signal to correct the fiber output signal. The working principle of the improved method is introduced in this paper. The structure of the specific optical system and the signal processing system are presented. Temperature fluctuation and magnetic change detection units are included in the design in order to provide signal selection under different environmental fluctuations, thus stabilizing the output current data. The signal processing system was proved to be effective by building an experimental platform.
Highlights
With the development of the smart grid, sensors in electric power systems have stricter requirements
The open loop structure of the polarization-type fiber optic current sensor is the fundamental reason for the low accuracy of fiber optic current sensor measurements
An external closed loop system was formed by introducing magneto-optical glasses for signal correction
Summary
With the development of the smart grid, sensors in electric power systems have stricter requirements. A greater temperature fluctuation exacerbates the fiber optic current sensor error drift [6]. The influence of ambient temperature on a quarter wave plate and Verdet constant were analyzed in a prior study, and the resulting fiber optic current sensor error expression was derived [8]. Some publications proposed measures for compensating temperature drift based on an analysis of the influence of temperature on fiber optic current sensor accuracy. The influence of external factors like temperature drift on the fiber optic current sensor can be equivalently converted into an additional magnetic field. After invoking weak derivatives approximation, light transmission in the fiber optic current sensor is the same as in a magneto-optical glass current sensor Both of the sensors are open loop systems, i.e. the measurement accuracy is determined by the environment and the open loop mechanism. Open loop loop in in aa polarization-type polarization-type fiber fiber optic optic current current sensor
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