11kv Siemens Vcb Price List Pdf
11kv Siemens Vcb Price List Pdf Online
8 Siemens HG 11.03 2010 Description Construction and mode of operation, standards, maintenance-free design 3AH3 Vacuum Circuit-Breakers Releases A release is a device which transfers electrical commands from an external source, such as a control room, to the latching mechanism of the vacuum circuit-breaker so that it can be opened or closed.
Table of Contents • • • • • • VCB stands for Vacuum Circuit Breaker. In vacuum circuit breakers, the vacuum is used as the arc quenching medium. Vacuum offers the highest insulating strength. So it has far superior arc quenching properties than any other medium (oil in, SF6 in ). For example, when contacts of a breaker are opened in the vacuum, the interruption occurs at first current zero with dielectric strength between the contacts building up at a rate thousands of times higher than that obtained with. The degree of vacuum is in the range from 10^-7 to 10^-5 torr.
The technology is suitable for mainly medium voltage application. For higher voltage vacuum technology has been developed but not commercially viable. Working Principle of Vacuum Circuit Breaker. Nas y damian marley distant relatives zip download.
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The production of arc in a vacuum circuit breaker and its extinction can be explained as follows: When the contacts of the breaker are opened in the vacuum (10^-7 to 10^-5 torr), an arc is produced between the contacts by the ionization of metal vapors of contacts. However, the arc is quickly extinguished because the metallic vapors, electrons, and ions produced during arc rapidly condense on the surfaces of the circuit breaker contacts, resulting in a quick recovery of dielectric strength. The salient feature of vacuum as an arc quenching medium is that as soon as the arc is produced in the vacuum, it is quickly extinguished due to the fast rate of recovery of dielectric strength in the vacuum. Construction of Vacuum Circuit Breaker Typical p arts of the vacuum circuit breaker are shown in the figure.