Citadel 2.0 - Instruction Manual - page:
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1.
Perform the contact-erosion check.
Contact erosion occurs when high fault-currents are interrupted.
Determination of contact wear condition is checked by viewing the contact-erosion dot (Figure 111).
The contact-erosion dot is located on the vacuum interrupter’s movable stem near the
guide-bushing.
Contact erosion dot check procedure;
a. Be sure the Citadel circuit breaker is “Closed”.
b. Observe the white contact-erosion dot (Figure 111) of each pole.
If any amount of the contact-erosion dot is visible, contact wear is within acceptable limits.
2.
Manually press the Open pushbutton on the Citadel after completing the contact-erosion
check.Visually verify the closing spring has “Discharged” and that the Citadel circuit breaker
is “Open”.
3.
Press the Close pushbutton. Nothing should happen.
The manual spring check should demonstrate smooth operation of the operating
mechanism.
Electrical control checks The electrical controls of the circuit breaker should be checked
during inspections to verify absence of any mechanical damage, and proper operation of the
automatic spring-charging and Close and Trip circuits.
Unless otherwise noted, all of these tests are performed without any control power applied
to the circuit breaker.
Check of the wiring and terminals
a. Physically check all of the circuit breaker wiring for evidence of abrasion, cuts, burning
or mechanical damage.
b. Check all terminals to be certain they are solidly attached to their respective device.
FIGURE 111 - CONTACT-EROSION CHECKMARK DOT
CIRCLED IN ORANGE
(SHOWN WITH CIRCUIT BREAKER OPEN)
M A I N T E N A N C E
