Information On This Booklet; Drawout; Standard Fixed; Application Of The X-Ray Emission Standards - ABB Vmax Manual

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.
Style frame width
vmax/w 492 mm / 19.3 inches
vmax 416 mm / 16.3 inches

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.
Continuous current
voltage rating
rating
15 kV 1200 A
15 kV 1200 A
1.7. Application of the X-ray emission
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
– application of the withstand voltage at industrial frequency,
– application of a voltage higher than the withstand voltage
– limitation of the above-mentioned local phenomena, with
This condition is intrinsically guaranteed by correct operation
of the operating mechanism and by adjustments of the
transmission system.
interruption ratings
(symmetrical RMS)
25 - 31.5 kA
25 - 31.5 kA
Standards
is absolutely safe;
according to the IEC 62271-100, VDE 0670 and IEEE
C37.04 Standards, is safe;
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;
interrupters with open contacts, depends on keeping the
specified distance between the contacts.
Configurations
available
Drawout
Standard fixed
3