刘志远

Date:

2025-04-30

Title of Paper:

Lightning Impulse Voltage Breakdown Characteristics of Vacuum Interrupters with Contact Gaps 10mm to 50mm

Journal:

IEEE Transactions on Dielectrics and Electrical

Summary:

The objective of this  paper is  to understand the  standard  lighting  impulse  voltage  breakdown characteristics of vacuum interrupters with contact gaps 10 to  50mm  and  how  contact  parameters  influence  the breakdown  characteristics.  The  investigated  contact parameters include  contact  diameter 75mm and  60mm, contact surface roughness 1.6 11 m and 3.2 11 m, and contact radius of curvature 6mm and 2mm. Therefore we designed four high-voltag vacuum interrupters in the experiments. The vacuum interrupters were put into a porcelain envelope with SF6  gas as  an  external insulation  of the  vacuum interrupters.  The contact gaps can be adjusted manually. Negative  polarity basic  impulse  level  (BIL)  voltage (1.2x50IlS)  was applied  by  an  up-and-down  method. Experimental results  revealed the  breakdown probability distribution  followed  a  Weibull distribution  when the breakdownvoltagesaturated  in  the  investigated  contact gaps 10 to 50mm. And 50% breakdown voltage U50 depends on the contact gap d (10-50mm), can be expressed by an equation U50=kd', where ex is a power exponent; k denotes acoefficient which is determined by experiments. Within the contact gaps 10 to 50mm, U50 of vacuum interrupter  with
contact radius of curvature 2mm was significantly higher than  that  of vacuum  interrupter  with contact  radius of
curvature 6mm. And U50 of contact roughness 1.6J1m  was close to that of contact roughness 3.2J1m. U50 of the contact diameter 60mm was close to that of contact diameter 75mm.

Co-author:

Zhang;Liu;Geng;Yang;wang

Volume:

v18 n6

Page Number:

2123-2130

Translation or Not:

No

Date of Publication:

2011-10-12