8 March 2014 Non-intrusive high voltage measurement using slab coupled optical sensors
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We present an optical fiber non-intrusive sensor for measuring high voltage transients. The sensor converts the unknown voltage to electric field, which is then measured using slab-coupled optical fiber sensor (SCOS). Since everything in the sensor except the electrodes is made of dielectric materials and due to the small field sensor size, the sensor is minimally perturbing to the measured voltage. We present the details of the sensor design, which eliminates arcing and minimizes local dielectric breakdown using Teflon blocks and insulation of the whole structure with transformer oil. The structure has a capacitance of less than 3pF and resistance greater than 10 GΩ. We show the measurement of 66.5 kV pulse with a 32.6μs time constant. The measurement matches the expected value of 67.8 kV with less than 2% error.
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Nikola Stan, Nikola Stan, Spencer Chadderdon, Spencer Chadderdon, Richard H. Selfridge, Richard H. Selfridge, Stephen M. Schultz, Stephen M. Schultz, "Non-intrusive high voltage measurement using slab coupled optical sensors", Proc. SPIE 9062, Smart Sensor Phenomena, Technology, Networks, and Systems Integration 2014, 90620J (8 March 2014); doi: 10.1117/12.2046049; https://doi.org/10.1117/12.2046049

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