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Partial discharge is a common insulation fault problem in power system. It will concomitance have ultraviolet light, infrared light, visible light, and local temperature rise. Accordingly, Partial discharge detection based on optical fiber ultraviolet sensing technology can be an effective and feasible insulation fault diagnosis scheme applied to power system. ZnO-nanorods have great development potential in ultraviolet detection due to its high exciton binding energy. From the three parties of controllable preparation of nanometer ZnO material, preparation of optical fiber ultraviolet sensing unit and design of optical path structure, this paper combines theoretical analysis method with experimental analysis method to give a deep analysis. Take advantage of the excellent sensing characteristics of micro-nano fiber, we proposed and designed a FLRD(Fiber Loop Ring Down)-based optical fiber ultraviolet sensing system used for partial discharge diagnosis. It can achieve a high sensitivity of 37.57 ns/nWcm−2 for ultraviolet sensing ranging from 3.18mWcm-2 to 9.55mWcm-2. Compared to existing ZnO UV detectors, the proposed system has advantage of simple to make, resist the influence of light source fluctuation, higher stability, higher sensitivity, and also it can realize long range detection. It provides a novel and effective reference for the research of fiber-based partial discharge detection in the electrical field.
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