Powered by Safety
®
45
IB-65100
Maintenance
The contact travel of the vacuum
interrupter contacts is measured by
subtracting the lengths between the
upper contact block and the vacuum
interrupter linkage pins in both the open
and closed positions. A label is supplied
on each vacuum interrupter with the
original setting and end of life dimensions
for that particular interrupter installed
on each circuit breaker. When the gap
measurement reaches the end-of-life value
given on this label, the vacuum interrupter
should be replaced. Refer to
Ch 6 Recommended Renewal Parts
and Repair Procedures,
C. R
EPLACEMENT
P
ROCEDURES
,
1) Vacuum Interrupter Assembly
.
2)
Vacuum
Integrity
Refer to the
Ch 4 Installation,
D. P
LACING
THE
C
IRCUIT
B
REAKER
I
NTO
S
ERVICE
for information
on vacuum integrity and testing of vacuum
interrupters.
3) Mechanical Adjustment of Vacuum Interrupters
There are no adjustments required
for routine maintenance of a vacuum
interrupter assembly. There are several
factory adjustments which will vary
over the operating life of the vacuum
interrupter.
ADJUSTMENTS OF THESE
SETTINGS ARE ONLY NECESSARY
WHEN REPAIR REQUIRES THE REMOVAL
OR REPLACEMENT OF THE VACUUM
INTERRUPTER.
DO NOT ADJUST
THESE SETTINGS UNNECESSARILY AS
DAMAGE TO THE CIRCUIT BREAKER MAY
RESULT.
When it is necessary to remove
or replace the vacuum interrupter, refer to
Ch 6 Recommended Renewal Parts and
Replacement Procedures,
C. R
EPLACEMENT
P
ROCEDURES
,
1) Vacuum Interrupter Assembly
or contact the Powell Service Division.
D. O
PTIONAL
M
AINTENANCE
P
ROCEDURES
1) High Potential Tests
High potential tests are not required for
routine maintenance but are recommended
after a heavy fault interruption, any major
circuit breaker repair that involves the
primary current path or when the circuit
breaker has been in storage for an extended
time, especially in a damp location or
other adverse environment. In these cases,
both the High Voltage Insulation Integrity
and Control Voltage Insulation Integrity
tests should be performed. For details of
maintenance procedures, see
Ch 4 Installation,
D. P
LACING
THE
C
IRCUIT
B
REAKER
I
NTO
S
ERVICE
.
