Detection partial discharge (PD) using the Ultra High Frequency (UHF) has proven its worth in monitoring the condition of insulation of GIS. UHF PD detection method has some advantages compared with conventional PD detection methods such as IEC standards 60270. This research uses UHF bow-tie antenna sensor to detect PD in GIS. In the initial design phase, the geometry of the antenna would be firstly optimized in order to obtain the optimum antenna characteristics, i.e. its gap distance, wing radius and flare angle. The antenna would be tested by using a vector network analyzer (VNA).

This paper presents a review of the recent trends and the current state of the art in the application of fiber optic fiber Bragg gratings (FBG) sensing technology to condition the monitoring (CM) and testing of practical electric machinery and the associated power equipment. FBG technology has received considerable interest in this field in recent years, with research demonstrating that the flexible, multi-physical, and electromagnetic interference (EMI) immune in situ sensing of a multitude of physical measurands of CM interest is possible and cannot be obtained through conventional sensing means. The unique FBG sensing ability has the potential to unlock many of the electric machine CM and design validation restrictions imposed by the limitations of conventional sensing techniques but needs further research to attain wider adoption. This paper first presents the fundamental principles of FBG sensing. This is followed by a description of recent FBG sensing techniques proposed for electric machinery and associated power equipment and a discussion of their individual benefits and limitations. Finally, an outlook for the further application of this technique is presented. The underlying intention is for the review to provide an up-to-date overview of the state of the art in this area and inform future developments in FBG sensing in electric machinery.

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