General;
The ultimate quality of electrical power supply is mainly determined by the medium voltage system. One of the most significant parts of this system is constituted by the switchgear circuit breakers.Over breakers employing other arc-quenching principals, vacuum circuit breakers offer several advantages particularly being practically maintenance free and capable of performing switchgear operations even in critical circumstances.The vacuum circuit breakers are perfectly conducting at the opening up to the precise moment of the alternating current zero point and completely insulating instantly after that point, hence vacuum breakers can be assumed to be "the ideal arc interrupting" circuit breakers. The vacuum arc of short lenght and forms of a plasma of high conducting metal vapours sustain a very low arc voltage until extinguishing take place at natural current zero point. Furthermore, the vacuum comprises physically the ideal insulator due to the theoretically impossible start of ionization process which causes the instant condensation of essential metal vapours on shield and contacts. The energy level developed inside the arc-quenching chamber is minimum because of the very low arc voltage related to immediate recovery of dielectric strength. Additionally, the energy necessary to the operating mechanism can itself be very reduced due to low strokes and minimized moving masses. Consequently, with the combination of these advantageous energetic features, from both arc-quenching media and operating mechanism, which provide practically free maintenance and capability of performing wide range of switching operations, the PVB type vacuum circuit breakers are ideal choice for your medium voltage system.
Description :
PVB type vacuum circuit breaker is mainly composed of:
- Three vacuum interrupters with insulating frame(s),
- Supporting frame between main components,
- PCRR 1000 type operating mechanism.
Type Test Reports
