Static voltage sharing technology of multi-break mechanical switch for hybrid HVDC breaker

Abstract

The hybrid high-voltage direct current (HVDC) breaker combines mechanical and power electronics switching that enables it to interrupt power flows within a few milliseconds. Mechanical switch is a key component of hybrid HVDC breaker and has a number of serially connected interrupter units which ideally would divide the voltage equally. The static voltage distribution characteristics and voltage sharing design of a multi-break mechanical switch were discussed in this study. A finite-element model was developed to study the static voltage distribution characteristics and capacitance parameters of multi-break mechanical switch (which actually consists of resistance and capacitance parameters under direct current) as a preliminary study. Comparisons were made under the simulation of vertical and U-shaped arrangement forms. The results indicate that the static voltage distribution of the high-voltage terminal is at least more than 65%, whereas the severe non-uniform voltage distribution can be well improved by means of the method proposed in this study.

Keywords

• HVDC power transmission
• finite element analysis
• voltage distribution
• circuit breakers
• capacitance
• static voltage sharing technology
• multibreak mechanical switch
• hybrid HVDC breaker
• high-voltage direct current breaker
• serially connected interrupter units
• static voltage distribution characteristics
• voltage sharing design
• mechanical switching
• power electronics switching
• finite-element model
• static voltage distribution
• capacitance parameters