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According to the relevant IEC standards, the back-to-back capacitor banks switching tests need to withstand an inrush current of 20 kA (peak) with 4250 Hz frequency. For vacuum interrupters (VIs), the contact surfaces may be seriously damaged by the high inrush current. The objective of this paper is to investigate how the inrush current influences the field emission current of VIs under power-frequency...
The objective of this paper is to investigate the influence of a high-frequency high voltage impulses conditioning on the inrush current interruption phenomena with considering the inrush currents. In this paper, six 7.2 kV vacuum interrupters (VIs) were used. First of all, six VIs were all conditioned by a several hundreds of batches of high-frequency high voltage impulses. Then the capacitive current...
The objective of this paper is to investigate how strong axial magnetic field (AMF) strength is needed in test duty T100s for a 126 kV single-break vacuum circuit breaker (VCB) as interrupting a rated short circuit current of 40 kA rms in light of arcing contact gap and arc duration. The AMF was generated by a pair of 2/3 coil AMF contacts. First, test duty T100s of the 126 kV single-break VCB were...
It is well-known that the high-voltage withstand ability of vacuum interrupters (VIs) can be increased by conditioning processes. Several conventional conditioning methods, such as spark conditioning and current conditioning, are used by most vacuum interrupter manufacturers. However, the conditioning efficiency of these methods is low and the conditioning energy is high which would lead to an accompanying...
Capacitive current switching has become increasingly necessary for power factor correction in distribution systems. However, Restrikes are potentially dangerous as they could cause overvoltage which can be harmful to the power system. The dielectric strength of the Vacuum Interrupter (VI) in a capacitive current switching is strongly determined by a condition of the contact surfaces modified by an...
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