Abstract
A new electro-optic hybrid current sensor is presented here. The sensor consists of three parts: first is a Rogowski coil and integrator whose output voltage is proportional to the current flowing in the power line. Second is a combination voltage to frequency converter and electro-optic converter. The combination converter transforms the integrated Rogowski coil voltage into a FM optical signal. The optical signal can then be transmitted to a low voltage region via an optical fiber for subsequent demodulation processing. Third is an intrinsic power supply in which a small conventional current transformer is used to draw power from the power line. A current sensor based on this design was developed, having a diameter of 15 cm, length of 30 cm, and weight of 2 kg, and has been working well at a 110 kV substation for two years. This sensor features small size, light weight, high accuracy, low cost, and reduced hazard.
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