CR194 Two-High Vacuum Limitamp@ Control
CONTROL POWER INTERLOCK (CPI)
Vacuum Interrupter Integrity Test
WARNING:
Confirm that equipment is de-ener-
gized before performing this check.
Check the CPI adjustments as shown in Figure 42 and
adjust if required.
1 \
a
;
HANDLE
I-Em4
+f
LATCH
RELEASE
9
c-
--
J
NOTE:
1. SET 0.12~INCH GAP (AS SHOWN) WITH PUSHER ROD
AND HANDLE LATCH RELEASE EXTENDED (OUT
POSITION). SEE 0.60-INCH REFERENCE.
2. THEN PUSH IN THE HANDLE LATCH RELEASE AND
CHECK THE CPI CONTACT GAP
3. BOTH CONTACTS MUST BE OPEN AND HAVE A
CONTACT GAP OF AT LEAST 5/64 INCH
Figure 42. Checking for proper operation of pusher rod
and control power interlock (CPI)
TEST POWER INTERLOCK (TPI)
Check the TPI adjustments as shown in Figure 43 and
adjust if required.
TPI
INTERLOCK
\
OPERATING
ROD
REF: FIG. 39
FOR
SIDE VIEW
DJUST INTERLOCK DEPRESSOR BRACKET(S) BY BENDING TO DEPRESI
INTERLOCK PLUNGERS FULLY WITH HANDLE IN “OFF” POSITION
Figure 43. Checking test power interlock (TPI) adjustment
WARNING:
The vacuum interrupter integrity test
should be performed before the high-voltage
contactor is energized for the first time and each
time it is returned to service after maintenance,
adjustment or repair (See GEH-5306). Otherwise
the vacuum interrupter integrity test should be
performed annually. Failure to perform this test
may cause serious injury or death.
WARNING:
All barriers must be in place and the
isolation switch handle must be in the “OFF”
(down) position (i.e. the handle latch release pops
back out) before attempting to perform the
vacuum interrupter integrity test.
WARNING:
This high-voltage test is potentially
hazardous, so extreme caution should be exer-
cised. First open the controller isolator switch,
then completely isolate the contactor by discon-
necting the contactor line side cables and load
side bolts and sliding the contactor to the “inter-
mediate” position using the safety stop.
WARNING:
X-Ray emission may be produced if an
abnormally high voltage is applied across the open
contacts of a vacuum interrupter. Do not apply an
RMS voltage across the contactor that is higher
than 20.0 kV RMS.
NOTE:
Before performing this vacuum integrity test, confirm
that both the armature gap setting and contact wear adjust-
ment are proper (See GEH-5306, Sections 5&6).
GENERAL
This test determines the internal dielectric condition
and vacuum integrity of the vacuum interrupters.
Prior to performing this test, the outside surfaces of
the vacuum interrupters should be wiped clean of any
contaminants with a non-linting cloth or industrial
type wiper. During this test, each interrupter should
be checked separately.
High potential test instruments can be purchased to
perform the vacuum interrupter integrity test. The fol-
lowing is a recommended test instrument:
Hipotronics Model 7BT60A
Use of a DC Hipot is not recommended because re-
sults may indicate a problem with a good interrupter.
If you wish to use a DC Hipot, set for 28 kV, but if an
interrupter fails, confirm the failed interrupter using
above AC Hipot.
NOTE:
If the controller fails to meet any of the above Me-
chanical Operation Checks, DO NOT ENERGIZE THE
CONTROLLER, Contact your nearest GE sales office.
24
To Next Page
Loading...
