Electric field calculation of dry DC bushing under complicated voltage

Author

Miao Wen ; Xin Lin ; Wen Shen ; Tian Ji

Author_Institution

Sch. of Electr. Eng., Shenyang Univ. of Technol., Shenyang, China

fYear

2013

fDate

20-23 Oct. 2013

Firstpage

1

Lastpage

4

Abstract

The converter transformer bushing is one of the key devices in high voltage direct current (HVDC) system, which has a complex insulation system. To comprehensively evaluate the insulation properties of ±600 kV dry DC bushing, a finite element model is built and the electric field distributions under complex voltage are calculated. Results show that: the electric field concentrates more in the epoxy resin under AC voltage while concentrates more in the SF₆ gas under DC voltage. Space charge will accumulate in the DC field, which can lead a tremendous change of electric field under the polarity reversal voltage. During the polarity reversal process, the maximum values of electric field in different materials appear depend on their material properties. Electric field calculation can provide advice to the insulation design of DC dry bushing.

Keywords

HVDC power convertors; SF₆ insulation; bushings; electric fields; finite element analysis; space charge; AC voltage; DC field; DC voltage; HVDC system; SF₆; complex insulation system; complicated voltage; converter transformer bushing; dry dc bushing; electric field calculation; electric field distributions; epoxy resin; finite element model; high voltage direct current system; insulation design; material properties; polarity reversal process; polarity reversal voltage; Flanges; Flashover; Insulators; Oil insulation; DC bushing; electric field calculation; insulation properties; polarity reversal;

fLanguage

English

Publisher

ieee

Conference_Titel

Electric Power Equipment - Switching Technology (ICEPE-ST), 2013 2nd International Conference on

Conference_Location

Matsue

Type

conf

DOI

10.1109/ICEPE-ST.2013.6804315

Filename

6804315