Powell PowlVac IB-65020A CDR 27kV, Руководство пользователя

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47
IB-65020A
Maintenance
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.
CAUTION CAUTION
!
Adjustments of these settings is 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
.
2) Timing
Perform CLOSE and OPEN timing tests at
the nominal control voltage. The voltage is
printed on the circuit breaker nameplate.
To measure CLOSE timing, operate the test
source to the CLOSE position. When the
circuit breaker closes, record the closing
time. The closing time from energizing the
closing coil to vacuum interrupter contact
touch should not exceed the values in
Table C, Timing .
Table C Timing
Cycles
Closing Time
(ms)
Tripping Time
(ms)
3 < 80 < 35
5 < 80 < 55
To measure OPEN timing, operate the test
source to the OPEN position. When the
circuit breaker opens, record the tripping
time. Operate the test source to the OPEN
position to open the circuit breaker and
record the opening time. The opening
time from energizing the shunt trip coil to
vacuum interrupter contact part should not
exceed the values listed in
Table C, Timing
.