Electrical diagnostics of high voltage devices via high resolution near field analysis

We here present our latest developments concerning an optical pigtailed electric field sensor dedicated to the monitoring and the analysis of medium and high voltage devices. This non invasive sensor allow to perform safely the electric field vectorial characterization in the closest vicinity of a device under test. The realized optical probe demonstrates here its potentialities for the diagnostic of a 25 kV monoconductor cable and is also exploited to analyse a default on a 100 kV insulator.