Observations from oil database analysis included a generic early degradation phenomenon, testing frequency of the common parameters, correlation of these parameters with transformer age as well as data interpretation in terms of incorporation of sampling temperature and potential revision to standardised values. Laboratory ageing experiments confirmed the suitability of methanol as a potential early paper ageing indicator in both an inhibited conventional mineral oil and a new inhibited gas-to-liquid hydrocarbon based oil. Measurements of methanol for UK field transformers showed a general increasing trend with ageing. Oil flow distribution in the windings has a direct impact on the cooling performance. CFD simulations and dimensional analysis were performed to study the occurrence of reverse flow in the winding. It was found that a higher oil flow rate does not necessarily mean a better cooling performance.
|Title of host publication||CIGRE|
|Publication status||Accepted/In press - 17 Jun 2016|
|Event||CIGRE Session 2016 - Paris, France|
Duration: 21 Aug 2016 → 26 Aug 2016
|Conference||CIGRE Session 2016|
|Period||21/08/16 → 26/08/16|