4. Replace and tighten the shorting link between the
current terminals before removing the ammeter.
NOTE: Bypass diodes in the battery circuit prevent the control
from being disabled if the link is inadvertently left open.
TESTING
Type GWC sectionalizers are carefully tested at the fac-
tory prior to shipment. Well-equipped test facilities, a
detailed testing procedure, and trained test personnel
assure that the unit will operate according to published
data. Permanent records are kept of each sectionalizer's
test performance.
Each sectionalizer leaves the factory ready for installa-
tion. Pre-installation testing is not necessary. However,
should verification of operation prior to installation be
desired, the following procedures should be used.
Test Circuit and Equipment
A suggested test circuit is shown in Figure 16. In this
test setup, the test current is obtained by back-feeding a
600:5 amp current transformer (located in the primary
loop of one phase of the sectionalizer) from an
adjustable 120Vac source. The ammeter scales should
be selected to accommodate the appropriate range of
test currents.
Pre-Test Procedures
Before performing any of the test procedures that follow,
make sure the 120Vac power to the voltage charging
board is disconnected to disable the voltage restraint
feature. The sectionalizer will not count as long as the
voltage restraint feature (part of the voltage charging
board) is energized.
To disable the voltage charging board, disconnect X-3
and X-4 leads on the battery charger board.
Test Procedures
While performing the following tests, monitor the conti-
nuity between test points C and D, F and H. If no conti-
nuity exists between either set of test points upon clos-
ing of the sectionalizer, apply 6 amps of load current by
closing switch S1 for 3.5 seconds. Once continuity has
been restored, open S1 and proceed with the test proce-
dures.
Minimum Actuating Current
The minimum actuating current can be verified by test-
ing at the ± 10 percent values of the phase and ground
actuating current ratings. For example, the minimum
actuating resistor rated at 80 amps is tested at 72 amps
(no count) and at 88 amps (count registered).
Phase Minimum Actuating Current
When checking the phase minimum actuating current, the
ground fault sensing portion of the sectionalizer must be
disabled. Testing an individual phase without disabling the
ground sensing circuits will cause a false count.
The following procedure can be used:
1. Jumper the ground actuating current resistor with a
short lead to disable the ground sensing circuit.
2. Jumper terminals P and D together.
3. Program the sectionalizer for one-count-to-open by
setting the COUNTS-TO-OPEN selector switch to “1”.
4. Close the sectionalizer by operating the Manual
Control Switch to “CLOSE”.
5. With the test circuit connected to phase A of the sec-
tionalizer and S1 open, hold S2 closed and slowly
raise the test current from zero to the appropriate
value shown in Column A of Table 9. Hold S2 closed
at this current for at least three seconds.
6. Release S2 to simulate a backup opening. The sec-
tionalizer should not open.
Type GWC Installation Instructions
16
T1— VARIABLE AUTO TRANSFORMER
T2— 600:5 CURRENT TRANSFORMER
S1— SPST TOGGLE SWITCH
S2— SPST PUSHBUTTON SWITCH
R1— DROPPING RESISTOR, 2K-10 WATT
A — AMMETER
A
T2
120 V
60 HZ
T1
S2
S1
R
Figure 16.
Test Circuit Schematic.