Type GV and GW sectionalizers are carefully tested at
the factory prior to shipment. Well-equipped test facili-
ties, a detailed testing procedure, and trained test per-
sonnel assure that the unit will operate according to pub-
lished data. Permanent records are kept of each sec-
tionalizer’s test performance.
Each sectionalizer leaves the factory ready for installa-
tion. Preinstallation testing is not necessary. However,
should verification of operation prior to installation be
desired, the these procedures should be used.
Test Circuit Equipment
A suggested test circuit is shown in Figure 17. In this
test setup, the test current is obtained by back-feeding a
500:5 A current transformer (T2, located in the primary
loop of one phase of the sectionalizer) from an
adjustable 120 Vac source. The ammeter scales (A)
should be selected to accommodate the appropriate
range of test currents.
Pre-Test Procedure
Before performing any of the test procedures that follow,
make sure the 120 Vac power to the heater and voltage
charging board (Figure 15) 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.
Test Procedures
While performing the following tests, monitor the conti-
nuity between test points C and D on the circuit board.
(see Figure 6). If no continuity exists between either set
of test points upon closing of the sectionalizer, apply 6 A
of load current by closing switch S1 for 3.5 seconds.
Once continuity has been restored, open S1 and pro-
ceed with the test procedures.
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 A
is tested at 72 A (no count) and at 88 A (count regis-
tered).
Type GV and GW Installation Instructions
16
T1– VARIABLE AUTO TRANSFORMER
T2– 500:5 CURRENT TRANSFORMER
S1– SPST TOGGLE SWITCH
S2– SPST PUSHBUTTON SWITCH
R1– DROPPING RESISTOR, 2 k
Ω
-10 W
A – AMMETER
A
T2
120 V
60 Hz
T1
S2
S1
R
AC Source
Figure 17.
Test Circuit Schematic.
TESTING
WARNING:
This equipment is not intended to
protect human life. Follow all locally approved
procedures and safety practices when installing or
operating this equipment. Failure to comply can result
in death, severe personal injury, and equipment dam-
age.
G102.1
!
WARNING:
The switchgear and high voltage
transformer must be in a test cage or similar pro-
tective device to prevent accidental contact with the
high voltage parts. Solidly ground all equipment.
Failure to comply can result in death, severe personal
injury, and equipment damage.
T221.3
!
