ABB DCGear Product Manual page 18

18 D C G e a r
4.6.1 HSCB Compartment
This compartment houses the high speed circuit
breaker mounted on a removable four-wheeled
trolley easily withdrawn from the cubicle. The
trolley is also equipped with line test device
(resistor, contactor and fuse).
The following main equipment will be mounted
inside the cell.
• Insulation shutter,mechanically operated by
the trolley
• Mechanical and electrical interlocks
• Mechanical breaker travel mechanism
• Auxiliary circuits connector
• Circuit breaker position indication limit switch
• Trolley earthing system
• Primary disconnector
• Heaters
In the cell, the circuit breaker may be in one of
the following position.
Service: Normal operating position, with main
Test/Disconnected: Main circuits are
Disconnected off-line: Main and auxiliary
NOTICE: trolley interlock mechanism introduction
P R O D U C T M A N U A L
and auxiliary circuit connected;
disconnected while
auxiliary circuits are
connected;
circuits are
disconnected.
As above two drawings show:when the HSCB is
in different positions of service,test and
disconnected, the indicator will pointing to
different directions.
When the trolley is going to the test position from
outside,it's needed to insert the operation lever
into the button of the front panel which shows
in the drawings and move it to the 45° direction
in order to come out the groove.
The permission position of the closing action in
the trolley test position is in the direction of 90°.
To push the trolley continually to the service place,
a action of operating the lever to 135° direction
should be done first to show up the groove.
The permission position of the closing action
in the trolley service position is also in the
direction of 90 degrees.
As be showed in the red circle of the left drawing
above,it's the soket of the operation lever for
prying the trolley to shuttle freely between test
and service.
The locker circled in blue in the right drawing
above is used to lock the trolley in it's test position.
When locked,a latch will be pluged into the cam
gear to restrict the mechanism to move. The same
one in red is used to lock in service.