Insulating systems for HVDC power apparatus

Author

Hammer, F. ; Küchler, A.

Author_Institution

F&G Hochspannungsgerate GmbH, Cologne, Germany

Volume

27

Issue

3

fYear

1992

fDate

6/1/1992 12:00:00 AM

Firstpage

601

Lastpage

609

Abstract

Well-known design rule for AC power apparatus insulation cannot be applied to HVDC insulation design in many cases. It has to be taken into account that electric field distributions are quite different from AC distributions due to the resistivity of the materials. Additionally, polarity reversals and transients result in field distributions different from steady-state AC and DC fields. External effects such as wetting of surfaces result in dramatic and often unexpected changes. These effects, appropriate design rules and technical solutions are discussed both for internal and external insulating systems by means of two examples for insulating interfaces which are typical but very critical examples of highly stressed insulations

Keywords

DC transformers; bushings; flashover; high-voltage engineering; insulation testing; insulators; power transformers; transformer insulation; transients; HVDC power apparatus; bushing; design rules; external insulating systems; field distributions; flashover tests; highly stressed insulations; insulating interfaces; internal insulating systems; polarity reversals; transients; wetting of surfaces; Conductivity; Electric fields; HVDC transmission; Insulators; Oil insulation; Petroleum; Power transformer insulation; Steady-state; Temperature; Transformer cores;

fLanguage

English

Journal_Title

Electrical Insulation, IEEE Transactions on

Publisher

ieee

ISSN

0018-9367

Type

jour

DOI

10.1109/14.142725

Filename

142725