Citadel 2.0 - Instruction Manual - page:
120
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Vacuum-integrity check (using mechanical test) (refer to Figure 111, page 125)
Before putting the circuit breaker into service, or if a vacuum interrupter is suspected
of leaking as a result of mechanical damage, check the vacuum integrity either
mechanically as described in this section, or electrically using a high-potential test set
as described in the next section.
Open and isolate the circuit breaker and detach the vacuum interrupter’s insulated push
rod from lower moving stem lever.
Normal atmospheric pressure will force the moving contact of a sealed vacuum
interrupter into the “Closed “position.
A vacuum interrupter may be assumed to be intact if it shows the following
characteristics:
A significant closing force is exerted on the sealed interrupter, requiring much effort to
overcome when attempting to pull the lower Vacuum interrupter’s stem to the “Open”
position by hand (Figure 111, page 125);
1.
When the lower moving stem linkage is released, it must automatically return to
the “Closed “position with an audible sound as the contacts touch.
After checking the vacuum, reconnect the linkage lever to the push rod assembly
(Figures 110A and 110B, page 121).
Vacuum-integrity check can be performed by doing an
elevated voltage (high-potential) test.
These instructions assume these tests (contact-erosion/
manual spring-charging check and vacuum-integrity/high-
potential tests) will be combined as described.
High-potential tests employ hazardous voltages which will cause death
and serious injury.
Follow safe procedures, and use safety barriers. Keep away from the
circuit breaker during application of test voltages.
Disconnect the moving secondary connector between the circuit breaker
and switchgear before conducting high-potential tests.
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M A I N T E N A N C E
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