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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 controlled switching technology of a short circuit current has been proposed for a long time. However, the opening time of the mechanism used in the high voltage circuit breaker is normally tens of milliseconds and has a variation of milliseconds. The electromagnetic repulsion mechanism has a very limited variation in the opening time. It provides a potential of achieving the controlled switching...
Nowadays the phase controlled switching is a preferred method for capacitive switching. Thus the distribution of prestrike gaps is an important issue for the control strategy. The objective of this paper is to understand the distribution of prestrike gaps for the contact materials manufactured by arc-melted and infiltration preparing technology in the capacitive service condition of 40.5kV vacuum...
Restrike caused by interrupting capacitor banks with vacuum circuit breakers will lead to severe switching overvoltage, which may cause great damage to power system. Reducing the probability of restrike during capacitive current breaking is the ultimate solution to limit overvoltage. In this paper, a new design of vacuum circuit breaker with a very low probability of restrike is proposed based on...
Capacitive current switching is a frequency task for reactive compensation in power system. The IEC standard 62271-100 and the Chinese standard GB 1984 require a severe inrush current of 20 kA peak and 4250 Hz frequency in back-to-back capacitor bank switching tests. Challenges still exist for commercial vacuum interrupters (VIs) to cope with the class C2 requirement in the standards. The objective...
The objective of this paper is to experimentally investigate the DC current switching characteristic of a combined DC circuit breaker. The DC circuit breaker, which is a combination of a DC switch and a fuse, has a significant advantage in full-range DC current switching. When a load current or an over-load current emerges, the DC load switch has the ability to clear the current. However, when a short-circuit...
The objective of this paper is to experimentally determine an opening displacement curve based on the vacuum arc anode mode diagram of a 126kV single-break vacuum circuit breaker. The experiments were carried out in a LC discharging circuit. In this experiment, a pair of 2/3 coil-type AMF contacts, with a diameter of 100mm and a contact material of Cu50Cr50, were installed in a demountable vacuum...
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