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PART B Installation, Operation & Maintenance
2.0 Breaker details
The circuit breaker type VBF is a three pole
vacuum
circuit
breaker
column type
construction with "spring stored
energy
operating
mechanism" as shown
Standard General Arrangement drawing
(refer Fig.1a, b & c)
3.0 Function
The standard schematic circuit diagram of the
breaker shown in Fig.3 (please refer order bound
drawings for details)
3.1 Switching operations
As supplied from ABB the circuit breaker will be
in
open
position
and closing spring in
discharged condition. When the control supply
is given to the breaker, closing spring will get
charged
automatically by means of spring
charging motor.
3.2 Closing operation
To close the circuit breaker the "CLOSE" control
element is actuated either electrically through
the closing coil or mechanically through
4.0 Installation
General
As supplied from ABB the circuit breaker are
complete in all respect with all the necessary
settings for smooth and trouble free operations
of the circuit breaker All the moving parts of
the circuit breaker are positioned correctly and
coupled together and they are well secured
with the fasteners.
and
designed in a
in
Breaker Pole
The breaker pole consists of (ref. Fig.2)
10001 - Insulator body
10200 - Vacuum interrupter
10017 - Lamellar contact
10502 - Current collecting hub
10008 & 10500 - Upper and lower terminal
10300 - Insulating Rod
10401 - Crank Housing
The poles are filled with SF6 or Nitrogen gas
individually at a pressure of 1.5 bar (abs).
(Nitrogen can be provided on request)
push
button
arrangement.
spring stored energy mechanism to release
spring
energy,
through
which rotate the common shaft. The rotation of
the common shaft moves the moving contact of
all the poles upward through the operating stud,
closing the circuit breaker. This movement also
exerts
the
required
contact pressure on the
moving contact.
3.3 Opening operation
To open the circuit breaker, the "OPEN" control
element
is
actuated
through the opening coil or mechanically through
push button arrangement. This enables the spring
stored energy mechanism to release the
energy through the linkage system, which rotate the
common shaft in opposite direction. This rotation
forces the moving contact of all the poles to move
downward, opening the circuit breaker.
It is
recommended to use standard tools and
standard practices for lifting and transport of the
circuit breaker at time of installation so as to avoid
mechanical damage of the pole parts. In general the
unpacking and lifting of the
be done as explained and given in clause 4.2.
This enables the,
the
the
linkage
system,
either
electrically
spring
circuit breaker shall
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