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Hybrid DC circuit breakers have the advantages of fast fault current interruption with the solid-state semiconductor devices and low conducting loss with the mechanical switches. Therefore it is suitable to be used in the multi-terminal DC transmission system. The objective of this paper is to determine a voltage sharing between the mechanical switch and the IGBTs in a proposed topology of hybrid...
The objective of this paper is to determinate the influence of grading capacitance on breakdown characteristics of a double-break vacuum interrupter. A prototype of double-break vacuum interrupter was built up as a U-type configuration with two 12 kV vacuum interrupters in series. The double-break vacuum interrupter is stressed by a power frequency withstand voltage and a lightning impulse withstand...
Researches on electromagnetic repulsion mechanisms are drawing more and more attention globally. The objective of this paper is to develop an electromagnetic repulsion mechanism for a 40.5 kV vacuum circuit breaker and then to make an optimization. Design of experiments (DOE) method are used to screen the prominent factors. Result shows that three impact factors are the prominent factors, which include...
The objective of this paper is to quantitatively determine the influence of six design parameters on three performance parameters of electromagnetic repulsion mechanism. Six design parameters include mass of moving part, radius of repulsion plate, thickness of the repulsion plate, pre-charged capacitance, initial charging voltage of pre-charged capacitance, and driving coil turns. Three performance...
The stray parameters of a double-break vacuum circuit breaker (VCB) have a significant influence on the voltage distribution of the two breaks. The stray parameters are equivalent to two main equivalent capacitors. The two main equivalent capacitors are the equivalent break capacitor (C1) and the equivalent capacitor between the middle point of the two breaks and earth (C2). The objective of this...
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