Small-size Space Charge Measurement Device for Power Cables by Using Electrically Insulated Acoustic Coupler

A space charge measurement method which The new device of space charge measurement for full-size cable was proposed, this measurement by means of the Pulsed Electro Acoustic (PEA) method. It basically employs the concept of pulsed electroacoustic method that includes acoustic coupling between the specimen and acoustic detector. In this proposal a polymeric material was applied as the acoustic coupler in order to retain electric insulation between the outer shield of the cable and the acoustic detector that made it possible to apply the pulse voltage onto the measuring point whereas the other part of the cable was grounded. In addition, by applying a periodically changing voltage onto the shield. electrode superposed with the pulse voltage, a precise calibration was made possible simultaneously with every shot of the space charge measurement.