Abstract
With the raise of the grade of voltage and current in the transmission line, the traditional current transformer based on electromagnetism theory can no longer satisfy the requirement of actual measurement in recent years. Therefore a new method of fiber optic current sensor is presented in this paper. Taking the iron-core coil with air gap as current transformer in high-voltage side, the system loads the weak current signal created by mutual inductance into thin film resistor. And the strength of electric current can be known indirectly by measuring the temperature of thin film resistor. On the basis of its structure and testing conditions, supporting with finite element software ANSYS, a three dimensions model about thin film resistor is developed and thermal analysis on it is done. The temperature characteristics of the device obtained by ANSYS can provide a basis for the analysis on the current transformer.
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