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Instructions for VR-Series
Replacement Breakers for
Westinghouse Type B20B/B22B
IB01301018E
I.B. 94A1994R01
Page 12
Effective: April 2005
SECTION 4: INSTALLATION AND INSPECTION
BEFORE PLACING THE BREAKER IN SERVICE, CAREFULLY
FOLLOW THE INSTALLATION PROCEDURE BELOW AND THE
SAFE PRACTICES SET FORTH IN SECTION 2. NOT FOLLOWING
THE PROCEDURE MAY RESULT IN INCORRECT BREAKER
OPERATION LEADING TO DEATH, BODILY INJURY, AND PROP-
ERTY DAMAGE.
When the breaker is first commissioned into service and each time
the breaker is returned to service, it should be carefully examined
and checked to make sure it is operating correctly.
4.1 EXAMINATION FOR DAMAGE
Examine the breaker for loose or obviously damaged parts. Never
attempt to install nor operate a damaged breaker.
4.1.1 NAMEPLATE VERIFICATION
Verify the information on the new VR-Series nameplate matches
the information on the purchase order. If any discrepancies exist,
notify Eaton’s Electrical Services & Systems for resolution prior to
proceeding.
4.2 OPERATIONAL POSITIONS
The breaker has four basic operational positions:
(1) Withdrawn position. In the withdrawn position the breaker is
out of the cell and the racking handle is not required for this
position. The racking system and cell interlocks are functional
relative to the operations of the breaker with the cell and interlock
cam positions. The breaker can be operated in this position rotating
the element mechanism at high rates of speed with great force.
Extreme care should be exercised to avoid inadvertent operation
and possible injury or equipment damage. The replacement breaker
may be moved into the cubicle easily on its own wheels without
any transfer truck.
(2) Test / Disconnect position. In the test / disconnect position
the breaker is in the cell with the right front corner of the breaker
truck visibly in position to activate the interlock lever on the right
side of the cell upon rising. The racking handle is not required for
this position. The breaker is not held captive in the cell and may be
operated manually or electrically using the jumper described in
section 3. At this point, the breaker may be lifted off the ground
using the racking handle crank which attaches to the elevating
mechanism shaft on the upper right front of the cubicle.
(3) Trip-Free position. The trip-free position is achieved by
lifting the breaker into the cell with the racking handle crank about 3
inches. The height of three inches is necessary to move the trip-
free interlock roller onto the guide cam. (Detailed in section 5.7)
Breaker operations may not be performed due to the interlock
holding the trip linkage engaged and a charging motor series
contact open. Manual charging of the breaker is possible, but an
attempt to close in this position would result in a trip-free operation.
WARNING
(4) Connect position. Once the breaker has been lifted to the
trip-free position, it remains trip-free only until it reaches the
connect position. The connect position is achieved by inserting and
rotating the racking handle crank clockwise (from the trip-free
position) to achieve about 14 inches of vertical travel from the floor
until safety rod holes are aligned. As the breaker is raised in the
cell, the primary voltage source shutters will open allowing the
breaker stabs to engage with the source. In the full elevated
position, the locking bars should be inserted and the locking bar
retainers rotated into place. This is the fully engaged or connected
position. The connect position can be verified by observing that the
high voltage shutters are open, the open and close linkages are
released, and the racking handle has been removed from the cell.
This corresponds to the highest position to which the breaker can
be raised causing the trip-free interlock roller to move back into the
operate position.
4.3 MANUAL OPERATIONAL CHECKS
Perform manual operational checks. To make these checks, the
breaker must be set in either the withdrawn or disconnect position.
Place the maintenance tool into the manual charge socket opening
and charge the closing springs. Approximately 36 up and down
strokes of the handle are required to cause the “Charging Spring
Status” indicator to show “Charged”. When charging is complete,
the closing crank goes over center with an audible “click” and the
springs Charged/Discharged Indicator shows “Charged”. Remove
the maintenance tool.
Note: If the springs are to be charged on a closed breaker, no click
is heard at the end of charging operation. Discontinue charging and
remove the maintenance tool as soon as “Charged” flag is fully
visible. Continued attempts to further charge may result in the
damage to the mechanism.
ALWAYS REMOVE THE MAINTENANCE HANDLE AFTER CHARG-
ING THE SPRING. FAILURE TO REMOVE THE MAINTENANCE
HANDLE FROM THE BREAKER COULD CAUSE DAMAGE TO THE
BREAKER MECHANISM, AND CAN BE HAZARDOUS TO PERSON-
NEL IF THE BREAKER WERE TO CLOSE.
Close and trip the breaker by pushing the manual close handle then
the manual open handle. (See Figure 3-3). Repeat the charge,
close, and trip procedure several times to confirm that the mecha-
nism operates consistently and reliably.
DO NOT ATTEMPT TO INSTALL OR OPERATE A VACUUM
CIRCUIT BREAKER UNTIL A VACUUM INTEGRITY TEST IS
PERFORMED.
Move the breaker to an area with adequate room for the following
tests:
WARNING
WARNING
