Nameplate; Vacuum Interrupter Integrity Check; Insulation; Main Circuit Resistance Check - Eaton W-VACi User Manual

5.3

Nameplate

Compare the circuit breaker nameplate information
with technical data in the technical parameters sections
2.4, 2.5 or 2.6. Also compare the breaker with the
breaker outline drawings and switchgear drawings for
conformance and compatibility. In case of potential
discrepancy, contact your Eaton representative before
installing the circuit breaker.
Fig. 5-6: Name Plate Label
5.4 Vacuum Interrupter Integrity
Check
Clean all the insulating surfaces of the pole units with a
dry, lint free cloth and denatured alcohol. Refer to
section 4.4 after this action is completed.
5.5

Insulation

The primary insulation for the vacuum interrupters
need to be checked. Refer to the procedure in Section
4.5 and Table 4.4. This can be done by closing the
circuit breaker and performing a power frequency
voltage test.
5.6

Main Circuit Resistance Check

Check the main circuit resistance. Refer to procedure
in Section 4.6. The DC resistance should not exceed
the permissible values. Record the obtained values for
future reference. Refer to Table 4-2 for value limits and
procedure.
Note: Do not apply test current to the spring of
main contact finger cluster. Refer to Fig. 4-1 for
finger cluster location. Damage can occur if this
process is not followed correctly.
5.7

Electrical Operations Check

After going through the previous steps, the breaker is
ready to be operated electrically. It is preferred that this
check be made with a withdrawable breaker in a "Test"
position or disconnected position. A fixed breaker can
not be in the cell during this test.
46
Examine the inside of the cell before inserting or
mounting the breaker for excessive dirt or anything
that might interfere with the breaker travel or
installation.
Extreme caution must be exercised to ensure
that primary circuits are not energized while
checks are performed in the breaker
compartment. Failure to do so may result in
personal injury or death.
The energy required by a circuit breaker closing
operation is normally provided by charging the closing
spring with a charging motor. Make sure that the
manual charging handle is inserted into the resting
place in the front cover. The closing spring can also be
charged manually as previously described. When
performing charging, closing or opening operations
electrically, observe that the indication of the charging
state to confirm they are correct.
When testing a withdrawable breaker electrically, it
should be done in the TEST position. To achieve the
TEST position, the circuit breaker must first be placed
in the cell structure with the shoot bolt engaged and
the secondary contacts engaged. To complete this
testing procedure, the operator should first be familiar
with inserting and removing the circuit breaker into and
out of the cell structure. When the circuit breaker
needs to be racked into switchgear, insert the racking
handle onto the racking coupling lever and rotate it
clockwise for insertion and counterclockwise for
withdrawal. When the circuit breaker has reached
"CONNECTED" position during the racking process, a
distinctive sound will be heard. Excessive force
applied to the racking handle when the circuit breaker
has reached "CONNECTED" position could cause
mechanism damage.
After completing this check, leave the "closing springs"
discharged, the breaker contacts "open", and the
breaker in "TEST" position until another check is ready
to be performed.
65A7355H01 November 2011 www.eaton.com
CAUTION
WARNING