Optical PD detection in high voltage cable accessories
A novel method in order to perform diagnosis of the insulation system is optical partial discharge detection.
This method does not work with the electrical signals which are caused in case of partial discharges but rather detects the optical signals which are coming up at the same time. Based on this different physical process, external electrical noise can be neglected which leads to a much better usability in the field. Based on the fundamental physical studies which were done by BAM, HPS, IPH, Polymerics and TU Berlin in advance, this paper presents the application behind this detection technique as well as a possible solution of the integration into high voltage cable accessories. At this the setup of an integrated optical fiber including its embedding is explained. Furthermore several requirements and their solution are presented such as void free integration, mechanical stresses inside the system and electrical tests (AC, DC and Impulse). The paper closes with showing the results of an integrated and operating system and compares the gathered results with an electrical measurement which was done simultaneously.