There are several test techniques offered in the industry for evaluating high voltage (HV) cable systems. There have been presentations made at technical meetings organized by the IEEE Insulated Conductor Committee (ICC) and CIGRE regarding the field testing and diagnostics of HV cables.
Some of the diagnostic test techniques are relatively new to the industry and have not necessarily been verified for suitability. This project was undertaken to highlight the different types of diagnostic tests available and establish those that are useful in both theoretical and practical fronts. Potential research opportunities have been discussed relevant to each test technique as unique insights to utilities and enthusiasts in the advanced cable testing domain.
Within the scope of the project, a guide for the best industry practice for advanced diagnostic testing techniques of HV underground cables is developed. The guide covers the test techniques applicable across all types of cable insulation: cross-linked polyethylene (XLPE), ethylene-propylene rubber (EPR), high pressure fluid-filled (HPFF), and low-pressure fluid-filled (LPFF). Various features, such as application, pros, cons, effectiveness, sensitivity, open issues, relative cost, outage requirements, etc., have been demarcated for the test techniques. The different modes of carrying out the tests, offline and online (temporary and permanent monitoring), are covered alongside the rating assigned to each advanced cable test technique.
HV cables, XLPE, HPFF, LPFF, cable diagnostics, AC Hipot, PD, FDS