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Instructions for VR-Series
Replacement Breakers for
Westinghouse Type B20B/B22B
I.B. 94A1994R01
Page 15
Effective: April 2005
IB01301018E
Figure 4-4 Rack-In Position of Handle
Engage the racking handle with the cell lifting mechanism’s drive
shaft and rotate the drive shaft to it’s full counterclockwise position.
In this position the lifting saddles of the cell should be at their lowest
position against the bottom stops. Push the circuit breaker into the
cell until the right rear corner of the breaker truck visibly against the
rear of the lifting saddle and the trip-free interlock roller is in position
to activate upon rising. When inserting the breaker into the cell, a
certain amount of position adjustment may be necessary for proper
cell fit. This is the disconnect position. In this position the breaker
can not be operated because the racking cams place the breaker in
a trip-free status.
Insert the racking handle on the racking shaft and turn clockwise
approximately 12 turns until the breaker has been lifted approxi-
mately three inches from the cell floor. The status of the breaker
will change from operate to trip-free indicated by the rise of the
manual open and close handles. There is no click, stop or different
feel to the racking handle at this point. The breaker is now in its
trip-free position.
To continue lifting towards the connect position, rotate the racking
handle clockwise. Check that the cell’s shutter opens as the
breaker approaches the connect position. This can be verified by
watching the shutter in the switchgear cell opening, allowing the
breaker stabs to engage with the source. Continue lifting the
breaker to the fully engaged or connect position. This corresponds
to the position to which the breaker can be raised, the locking rods
should be inserted and the locking bar retainers rotated into place.
The connect position can be verified by observing that the high
voltage shutters are open, the open and close linkages are
released, the racking handle has been removed from the cell, and
the safety rod holes are aligned. Care and experience is needed in
order to determine whether a more than usual force is required to
raise the breaker into a cell, as this might be an indication of
mechanical interference or misalignment of components. If unusual
force is noted, the breaker should be withdrawn from the cell and
reexamined to determine the reason.
4.10 REMOVAL PROCEDURE
To remove the breaker from the cell it must be in the open position.
Rotate the locking bar retainers and remove the locking bars.
Insure the breaker is open and engage the racking handle. Lower
the breaker by rotating the racking handle counter-clockwise. The
breaker will travel down before the primary contacts or secondary
contacts are disconnected. The breaker will be in a non-operable
mode and will go through a trip-free operation if any attempt to
close it is made in the intermediate position. The shutters will close
after the main stabs have cleared, isolating the breaker from its
source. Continue lowering the breaker. The rear wheels will start
lifting from contact with the cell floor, discharging the springs.
Continue until the racking mechanism reaches it’s travel stop. This
corresponds to the lowest position to which the breaker can be
racked causing the trip-free interlock roller to move back into the
operate position. The breaker is in the disconnect position and the
trip mechanism is released, allowing the breaker to be operated
either electrically or mechanically. If electrical operation is desired
in the disconnect position, the secondary disconnect must be
energized using the jumper described in section 3.
To remove the breaker from the disconnect to the withdrawn
position, the breaker should be tripped and the closing springs
discharged. The secondary contact block jumper should be
disconnected. To remove the breaker from the disconnected to the
withdrawn position, the breaker is pulled manually by the handles.
When removing the breaker into the cell, a certain amount of
position adjustment may be necessary for proper cell fit.
Figure 4-5 B20B/B22B-VR Connected Position (B22B-VR
Shown)
