Evaluation of insulation of H.V. Bushing—Online monitoring tgδ of a 500kV bushing

Author

Yi Li ; Mingjun Cheng ; Huaping Xu ; Shengjie Huang ; West, Herschel J.

Author_Institution

EHV Transm. & Substation Co., Guiyang Branch, China Southern Power Grid Co., Ltd., Guiyang, China

fYear

2014

fDate

1-5 June 2014

Firstpage

303

Lastpage

306

Abstract

This paper represents a series of online monitoring data from a 500kV bushing on a converter station´s transformer. An online monitoring system with a novel tgd measuring method has been successfully used for bushing tgd supervision. Long term data acquisition is evaluated for the insulation integrity of the bushing. It shows that bushing tgδ depends on its temperature/voltage intersect influence during operation. The largest bushing tgd occurred at the highest voltage and the lower temperatures. A further study of the temperature/voltage intersect influence on bushings need to be scheduled.

Keywords

bushings; computerised monitoring; power transformer insulation; H.V. bushing insulation; bushing tgd supervision; converter station transformer; insulation integrity; long term data acquisition; online monitoring data; online monitoring system; voltage 500 kV; Grounding; Instruments; Insulators; Monitoring; Temperature measurement; Temperature sensors; Bushing; Insulation; Intersect influence; Online monitoring; Temperature; tgδ;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrical Insulating Materials (ISEIM), Proceedings of 2014 International Symposium on

Conference_Location

Niigata

Type

conf

DOI

10.1109/ISEIM.2014.6870779

Filename

6870779