Racking Handle; Circuit Breaker Interaction With Switchgear - Eaton W-VACi 12 kV User Manual

5.8

Racking handle

The racking handle is used to move withdrawable
circuit breakers from the test position to the service
position.
Fig. 5-7: Racking Handle
Fig. 5-8: Inserted racking Handle
Cradle Interlock Notice:
When a cradle electromagnetic interlock is installed,
the beginning torque can not be greater than 25 Nm. If
a greater force is used, this will cause damage to the
interlock. If the circuit breaker can not be racked in,
check to see if the interlock is receiving the proper
voltage.
Fig. 5-8 b: Levering In Force Notice
5.9
W-VACi circuit breakers provide a number of safety
interlocks. The following list can help confirm the
breakers function properly.
1. When the breaker is in the "CLOSED" state, the
operation of close cannot be accomplished again until
"OPEN" operation has been completed.
2. When the breaker is in the "CLOSED" state and the
function of anti-pumping is on, the spring release
cannot actuate.
3. When the breaker is in the "CLOSED" state, it
cannot be racked into the switchgear from the TEST
position to the SERVICE position.
4. Withdrawable type breakers cannot be racked out
from the switchgear from the SERVICE position to the
TEST position in the "CLOSED" state.
5. Withdrawable type breakers cannot perform
"CLOSE" and "OPEN" operations between the TEST
and SERVICE positions.
6. For withdrawable breakers with optional electrical
magnetic interlock, the breaker cannot finish the
"CLOSE" operation, unless the secondary disconnect
is connected and the breaker is either at TEST or
SERVICE position. See section 5.12.
7. As to other optional parts, such as, Under Voltage
Release (UVR) trip device or an over current trip, you
must confirm their function based on their system
design needs. Please refer to your own specifications
when you ordered the breaker.
8. When there is no power supplied to the mechanism
electromagnetic interlock, the breaker will not be
allowed to "CLOSE" manually.
9. When there is no power supplied to the cradle
electromagnetic interlock, withdrawable type breakers
cannot be racked out from the switchgear from the
SERVICE position to the TEST position.
65A7355H01 November 2011 www.eaton.com
Circuit Breaker Interaction
with Switchgear
WARNING
Never disable any interlocks. They are intended
for proper and safe operation. Failure to comply
could result in death, severe personal injury
and/or property damage due to the hazardous
voltage present.
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