Voltage Restraint
When energized at 120Vac, the voltage charging board
provides fast charging times for the trip energy storage
capacitors. It also acts as a voltage restraint; the sec-
tionalizer will not count an overcurrent interruption of
the protective device unless the voltage at the control is
also interrupted. To check the voltage restraint feature,
proceed as follows:
1. Reconnect X-3 and X-4 leads to the battery charging board.
2. Jumper the ground actuating resistor with a short
lead to disable the ground sensing circuit.
3. Jumper terminals P and D together.
4. Program the sectionalizer for one-count-to-open.
5. Close the sectionalizer by operating the Manual
Control Switch to “CLOSE”.
6. With the test circuit connected to phase A of the sec-
tionalizer and S1 open, close S2 and raise the current
to slightly above the appropriate value shown in
Column B of Table 9. Hold S2 closed at this current
for at least three seconds.
7. Release S2 to simulate a downline device clearing the
overcurrent. The sectionalizer should not open.
8. Disconnect X-3 and X-4 leads on battery charger boards.
9. Again close and release S2. The sectionalizer
should open.
10. Remove the jumper from terminals P and D.
Number of Counts-to-Open
The number of counts-to-open can be verified by inter-
rupting, the preset number of times, an overcurrent
through the sectionalizer. For example, with the control
set for three counts, the sectionalizer will open upon the
third overcurrent interruption. Proceed as follows:
1. Jumper the ground actuating current resistor
with a short lead to disable the ground sensing
circuit.
2. Program the sectionalizer for three counts-to-
o p e n b y s e t t i n g t h e C O U N T S - T O - O P E N
SELECTOR switch to “3”
3. Close the sectionalizer by operating the Manual
Control Switch to “CLOSE”.
4. With the test circuit connected to phase A of the
sectionalizer and S1 open, close S2 and raise
the test current to slightly above the appropriate
value shown in Column B of Table 9. Hold S2
closed at this current for at least three seconds.
5. Open and close S2 a number of times. The section-
alizer should open upon the third opening of S2.
6. To verify the two-counts-to-open setting, set the
COUNTS-TO-OPEN SELECTOR switch to “2” and
repeat steps 3 through 5. The sectionalizer should
open upon the second opening of S2.
Count Reset
The count reset feature resets the sectionalizer count to
zero whenever current below the actuating level flows
through the sectionalizer for longer than the pro-
grammed reset time without interruption. The reset time
settings have a tolerance of ±10 percent.
It can be verified by interrupting an overcurrent flow
through the sectionalizer one time less than the
counts-to-open setting, then allowing load current to
flow for periods just under and just over the reset set-
ting. The sectionalizer should open if the overcurrent
for the final count is interrupted within the reset time
period (count has reset to zero). The following proce-
dures is used to verify the count reset:
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 control for two counts-
to-open and set the COUNT RESET SELECTOR
to 15 seconds.
4. Close the sectionalizer by operating the Manual
Control Switch to “CLOSE”.
5. With test circuit connected to phase A of the sec-
tionalizer and S1 open, close S2 and raise the test
current to slightly above the appropriate value
shown in Column B of Table 9. Hold S2 closed at
this current for at least three seconds.
6 . Release S2 to simulate a backup protective
device clearing the overcurrent. The sectionalizer
will register a count.
7 . Close S1 for 13.5 seconds.
8. Momentarily close and then release switch S2. The
sectionalizer should open, verifying that the count
reset has not been activated.
9. Reclose the sectionalizer. Close and release S2
once to register one overcurrent interruption count.
10. Close S1 for slightly more than 16.5 seconds.
11. Momentarily close and release switch S2. The sec-
tionalizer should not open verifying that the count
reset has been activated and the first count has
been erased.
12. Again, close and release S2. The sectionalizer
should open.
13. Remove the jumper from terminals P and D.
Type GWC Installation Instructions
18