Title :
Winding slackness monitoring as a diagnostic for insulation ageing in oil-paper insulated power transformers
Author :
De Klerk, PJ ; Reynders, JP
Author_Institution :
Eskom Technol. Group, South Africa
Abstract :
On-line methods of monitoring ageing in oil-paper insulated power transformers are limited. In this work, the use of a novel, galvanically isolated, displacement transducer is investigated, which uses winding slackness as surrogate for ageing of the paper insulation. An experiment is described, in which paper ageing is accelerated by means of elevated temperature and ageing is monitored by dissolved gas analysis, Furan analysis and depolymerisation of the paper. These observations correlate very well with increased displacement measured in the winding on the transformer core
Keywords :
power transformer insulation; Furan analysis; depolymerisation; displacement measurement; dissolved gas analysis; elevated temperature; galvanically isolated displacement transducer; insulation ageing diagnosis; oil-paper insulated power transformers; paper ageing acceleration; transformer core; winding slackness monitoring;
Conference_Titel :
High Voltage Engineering, 1999. Eleventh International Symposium on (Conf. Publ. No. 467)
Conference_Location :
London
Print_ISBN :
0-85296-719-5
DOI :
10.1049/cp:19990538
