3
Style
frame width
voltage rating
Continuous current
rating
interruption ratings
(symmetrical RMS)
Configurations
available
vmax/w
492 mm / 19.3 inches
15 kV
1200 A
25 - 31.5 kA
Drawout
vmax
416 mm / 16.3 inches
15 kV
1200 A
25 - 31.5 kA
Standard fixed
1.5. Drawout
A Drawout circuit-breaker is a breaker that may be removed
from a cell without unbolting connections or mounting
supports. It is intended for use in Abb PowerCube modules.
It contains primary and secondary disconnects and provides
two operating positions: Disconnect and Connect.
1.6. Standard fixed
A fixed circuit-breaker is a breaker that is bolted in its
enclosure and wired to the load frame. A fixed circuit-
breaker can be mounted directly on supporting frames or
on a supporting truck to be provided by the customer. The
circuit-breaker, with supporting truck, must be suitably fixed
to the floor of its own compartment by the customer. The floor
surface in correspondence with the truck wheels must be
carefully levelled. A minimum degree of protection (IP2X) must
be guaranteed from the front towards live parts. The standard
fixed version of Vmax must be installed by the customer in a
minimal enclosure so as to guarantee a minimum degree of
protection as for C37.20.2 and C37.55 test requirements.
1.7. Application of the X-ray emission
Standards
One of the physical properties of vacuum insulation is the
possibility of X-ray emission when the interrupter contacts are
open.
The specific tests carried out at the PTb laboratories
(Physikalisch-Technische bundesanstalt, in brunswick -
Germany) show that local emission at a distance of 10 cm from
the interrupter or pole surface, does not exceed 1 mSv/h.
it follows that:
– at the rated service voltage the use of vacuum interrupters
is absolutely safe;
– application of the withstand voltage at industrial frequency,
according to the IEC 62271-100, VDE 0670 and IEEE
C37.04 Standards, is safe;
– application of a voltage higher than the withstand voltage
at industrial frequency or of a direct current test voltage
in direct current, specified in the IEC, VDE and ANSI/IEEE
Standards, cannot be used;
– limitation of the above-mentioned local phenomena, with
interrupters with open contacts, depends on keeping the
specified distance between the contacts.
This condition is intrinsically guaranteed by correct operation
of the operating mechanism and by adjustments of the
transmission system.
1.4. Information on this booklet
This booklet provides information for the Vmax/w and Vmax
circuit-breakers as described below. Not all sections of
the bulletin apply to all types of Vmax/w and Vmax circuit-
breakers. All information in this booklet was current at the
time of printing. unless otherwise noted, all references in this
booklet are determined by viewing the circuit-breaker from the
front.
