Modelling of Relaxation Phenomena in Transformer Oil-Paper-Pressboard Insulation to determine the Dielectric Response Behaviour under DC and Impulse voltages

The factory acceptance tests are extremely important for the deployment and service life of Extra-high voltage transformers (EHV) and reactors. An essential part of such tests is Lightning Impulse (LI) tests which are intended to ensure that the transformer insulation withstands the transient lightning overvoltages which may occur while in...