Citadel 2.0 - Instruction Manual - page:
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I N I T I A L C H E C K S A N D F U N C T I O N A L T E S T I N G
Introduction
Checks and tests to be performed on the circuit breaker module only
.
Vacuum circuit breakers are normally shipped with their vacuum interrupter’s primary
contacts closed and their mechanism springs discharged.
However, it is
CRUCIAL
to first verify the spring-loaded mechanism is in the discharged
condition after de-energizing control power for safety and to insure no automatic spring
charging can occur.
Discharge the close spring via mechanical front panel push button – then discharge the
opening spring via its front panel push button.
De-energizing control power in switchgear
When the circuit breaker is mounted in switchgear, open the control-power disconnect
device.
In metal-clad switchgear, the control power disconnect device is normally a pullout-type
fuse holder, a molded-case circuit breaker, or knife switch.
Opening this fuse holder, circuit breaker or switch device results in control power
disconnection.
Perform the spring-discharge check before moving a circuit breaker from a pallet or
removing it from the switchgear.
The spring discharge check should be performed after de-energizing control power.
This check assures both the tripping and closing springs are fully discharged.
1.
Press Trip pushbutton.
2.
Press Close pushbutton.
3.
Press Trip pushbutton again.
4.
Spring-condition indicator
should show -
DISCHARGED
5.
Main contact status indicator
should show breaker -
OPEN
Open Operation
Close Operation
Open | Close
indicator
Spring-condition
indicator
FIGURE 1: FRONT PANEL CONTROLS OF CIRCUIT BREAKER