刘志远

Date:

2025-04-30

Title of Paper:

Development of High Voltage Vacuum Circuit Breakers in China

Journal:

IEEE Transactions on Plasma Science

Summary:

This paper introduces a research work on the devel-opment of high-voltage (HV) vacuum circuit breakers (VCBs) in
China from its start point 1989 to 2006. In this period, a 126-kV two breaks VCB prototype and a 126-kV single break VCB pro-totype were developed. A latest 252-kV single break interrupter prototype is introduced. Five HV VCBs technologies are discussed,which include HV vacuum insulation, high current interrupting technology with long contact gaps, increasing nominal current,operating mechanism characteristics, and contact bouncing damp-ing. In vacuum insulation, adding a metal ring at electrode back can decrease breakdown possibilities in the gap between the elec-trode back and main shield. Surface melting layer of contact ma-terial could have influence on voltage withstanding capability of a vacuum gap. For interrupting high current with long contact gaps, strong axial magnetic field (AMF) is needed for a better vacuum arc control. Therefore, a single coil AMF electrode is introduced.Heat radiators are effective to increase nominal current of VCBs.Thermal analysis can help to give appropriate design parameters.
There is an optimum opening characteristic that is helpful to im-prove the interrupting performance of VCBs. Permanent magnet operating mechanism and spring-type operating mechanism are suitable for HV VCBs. Contact bouncing in HV VCBs can be damped by installing contact spring and bellows on stationary end of VCBs.

Co-author:

Liu,Wang,Xiu,Wang,Yuan,Jin,Zhou,Yang

Volume:

Vol.35, No.4

Page Number:

856-865

Translation or Not:

No

Date of Publication:

2007-08-15