GE Industrial Solutions PowerVac PV-VL 13.8-1000-0 and -1 - Manual (Page 31)

GEH 6468A - Power/Vac VL Breaker Page 31
The gaps must be between the 0.60 inch
maximum for the center phase and 0.54 inch
minimum for all phases. It is not necessary that all
readings correspond. A properly adjusted breaker
often has more gap and wipe on the center pole
than on the outside poles.
CAUTION: DO NOT ALLOW ANYTHING TO
COME IN CONTACT WITH THE INTERLOCK
ROLLER ON THE RIGHT SIDE OF THE
MECHANISM, OR THE SPRING DISCHARGE
PIN ON THE LEFT SIDE OF THE MECHANISM.
11.4. CLOSE COIL PLUNGER GAP
The close coil plunger gap is shown in Figure 30.
With the closing spring discharged, operate the
plunger to make certain that the plunger moves
freely over its full stroke in the coil. To check the
closing coil plunger gap the breaker should be
open and the closing spring charged and gagged.
Dimension C is obtained by depressing the close
plunger button until resistance is felt. The gap
between the plunger button and the coil housing
should be between 0.35 and 0.40 of an inch.
11.5. TRIP COIL PLUNGER GAP
The trip coil plunger gap is shown in Figure 32.
With the breaker in the open position and the
closing spring in the charged position, make certain
that the trip linkage and trip shaft move freely over
the full plunger travel. To check the trip coil
plunger gap adjustment, the breaker is to be closed
with the closing spring discharged. Dimension T
between the plunger button and the coil housing
should be between 0.20 and 0.25 inch. This
dimension is obtained when the trip plunger button
is depressed until resistance is felt. If the breaker is
equipped with an optional second trip coil, use
same procedure.
11.6. CONTROL SWITCH ADJUSTMENT
The breaker is to be in the open position with the
opening and closing springs discharged. This
results in the control switch plungers being in the
depressed position. The switches to be checked
are shown in Figure 31. On the LCS and stacked
switches (SM/LS & CHG), the plunger rod is to be
recessed within the rear of the switch body. The
recess should measure between 0 and 1/32 inch.
This is a visual check. The CL/MS switch with
wiring terminals on the side is to be adjusted as
described above. For the CL/MS switch with wiring
terminals on the rear, the plunger is set to 0.99 to
1.01" from its mounting bracket.
12. ELECTRICAL CHECKS
12.1. ELECTRICAL OPERATION
To check the electrical operation, attach a
secondary test coupler to the circuit breaker
connector. Check the control voltage on the
nameplate and close and open the breaker several
times.
CAUTION: REPEATED OPERATIONS AT A
RATE EXCEEDING TWO PER MINUTE MAY
CAUSE CHARGING MOTOR OVERHEATING
AND FAILURE.
Leave the circuit breaker in an open and spring
discharged condition after checks are complete
and refer to metal-clad instruction book GEH-
1802X before inserting the circuit breaker into a
metal-clad unit. Reinstall the front cover if it has
been removed.
12.2. HIGH-POTENTIAL TEST
If high potential tests to check the integrity of the
insulation are required, the AC high potential test
described below is strongly recommended. DC
high potential testing is not recommended. The
following procedure must be adhered to.
CAUTION: IF DC HIGH POTENTIAL TESTING IS
REQUIRED, THE DC HIGH POTENTIAL
MACHINE MUST NOT PRODUCE PEAK
VOLTAGES EXCEEDING 50 kV.
12.2.1. PRIMARY CIRCUIT
Electrical checking consists of electrical breaker
operation, primary and secondary wiring high-
potential testing (if required), primary circuit
resistance (if required), POWER/VAC interrupter
high-potential testing, and insulation resistance to
ground.
The breaker should be hipotted in the closed
breaker mode. An AC hipot machine capable of
producing the test voltages shown below may be
used to hipot the breaker phase to phase and
phase to ground.
BREAKER VOLTAGE TEST VOLTAGE
4.16 kV 14 kV
7.2 kV 27 kV
13.8 kV 27 kV
The machine should be connected with its output
potential at zero and the voltage increased at
500