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Principle and Dynamic Characteristics of Closed Loop Fiber Optic Current Sensor

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By using of electro-optical sensing effect and digital closed-loop signal processing technology, fiber optic current sensor overcomes the weakness of electromagnetic current transducer in dynamic range and transient response, and meets the demand of modern power industry. Digital closed loop signal processing technology of fiber optic current sensor is presented, and dynamic characteristics in the sensor are demonstrated theoretically and experimentally. We analyze functional structure and signal transfer process, build feedback model, and deduce transfer function based on the principle of fiber optic current sensor, by reference of digital closed loop fiber optic gyroscope technology, which is advanced and mature. Then, several main kinds of system dynamic response performance of fiber optic current sensor are simulated, including phase-frequency characteristics, magnitude-frequency characteristics, step characteristic, harmonic characteristics, and so on. Simulation results of fiber optic current sensor demonstrate that current measured range greater than 100 kA, frequency bandwidth greater than 7 kHz, 50th harmonic measured in the sensor is accurate. Furthermore, current transient response process with 157 KA is tested and verified in product laboratory.
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Document Type: Research Article

Publication date: 2011-10-01

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