Answer / thowsif_emerson

1.VCB= vacuum circuit breaker normally used in HV
applications.
ACB = Air circuit breaker, normally used in LV
applications.

2.There are two main technologies used for these devices
with different characteristics in terms of
switching quality and cost each having its merits and
deficiencies: Static Transfer Switches
(STS) and Automatic Transfer Switches (ATS).

A>STS is based on static electronic components (SCR)
therefore allowing for a fast and precise
control of the switching between one line and the other.
This solution permits to obtain a perfect
Break Before Make (BBM) behaviour by never permitting a
source overlap. Moreover, it is also
capable of very fast switching between the two sources with
a max delay of less than 5 msec
(typically 4 msec).

B>ATS is based on electromechanical components where the
BBM switching is actually made by
controlling the relays on each source line. This kind of
technology can still make a perfect Break
Before Make change of supply sources both in synchronous
and asynchronous conditions but it
is certainly slower than the static solution.

Answer / dips

VCB means vacuum CB
ACB means air CB

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