Axial magnetic field strength needed for a 126kV single break vacuum interrupter

Author

Zhang, Yingyao ; Geng, Yingsan ; Yu, Li ; Yan, Jing ; Liu, Zhiyuan ; Hu, Chongming ; Yao, Jianjun

Author_Institution

State Key Lab. of Electr. Insulation & Power Equip., Xi´´an Jiaotong Univ., Xi´´an, China

fYear

2010

fDate

Aug. 30 2010-Sept. 3 2010

Firstpage

320

Lastpage

323

Abstract

The objective of this paper is to investigate how strong the axial magnetic field (AMF) is needed for a 126kV vacuum interrupter at different contact gaps. The AMF was generated by a pair of 2/3 coil AMF contacts. First, the accuracy of the three-dimensional finite element simulation of AMF was validated by an AMF measurement at contact gap 30mm. After that high-current switching experiments with the AMF contacts were carried out at different contact gaps of 20mm and 50mm at 40kA rms. Then the AMF at the contact gaps of 20mm and 50mm was simulated to analyze the interrupting experimental results. The results showed that there was a successful interruption at 40kA with an AMF of 235mT at contact gap 20mm. And current interruption failures occurred with an AMF of 146mT at contact gap 50mm.

Keywords

finite element analysis; magnetic fields; vacuum circuit breakers; axial magnetic field strength; high-current switching; single break vacuum interrupter; three-dimensional finite element simulation; Analytical models; Copper; Current measurement; Interrupters; Magnetic field measurement; Magnetic fields; Magnetic flux density;

fLanguage

English

Publisher

ieee

Conference_Titel

Discharges and Electrical Insulation in Vacuum (ISDEIV), 2010 24th International Symposium on

Conference_Location

Braunschweig

ISSN

1093-2941

Print_ISBN

978-1-4244-8367-9

Electronic_ISBN

1093-2941

Type

conf

DOI

10.1109/DEIV.2010.5625829

Filename

5625829