Minimum Actuating Current
The minimum actuating current levels for both phase and ground
are determined by the selection of the proper plug-in resistors.
(Normally these settings are approximately 80 percent of the
minimum trip settings of the backup protective device.)
NOTE: If the backup device is not equipped for ground fault
sensing and tripping, the ground current sensing cir-
cuits of the sectionalizer can be de-activated by using
a shorting resistor labeled “BLOCK”.
Phase current resistors are identified with the phase sym-
bol (ø) and the actuating current value in amps. Catalog
numbers for the available phase current resistors are listed
in Table 3.
Ground current resistors are identified with the ground sym-
bol (
) and the actuating current value in amps. Catalog
numbers for the available ground current resistors are listed
in Table 4.
The minimum actuating current of the sectionalizer for
both phase and ground can be changed by merely
changing the appropriate plug-in resistor.
Counts-to-Open
The counts-to-open setting is determined by the position
of the COUNTS-TO-OPEN SELECTOR switch. Switch
positions 1, 2, and 3 correspond to 1, 2, or 3 counts to
open. Normally this setting is one less than the number
of operations to lockout of the backup protective device.
To change the number of counts-to-open setting, merely
change the position of the rotary switch.
Count Reset
The reset setting is determined by the position of the
COUNT RESET switch. Reset times of 15, 30, 60, 90,
120, and 180 seconds are available. This feature resets
to zero, and any accumulated counts are cancelled
whenever current, below the minimum actuation level,
flows through the sectionalizer without interruption for
longer than the time programmed.
The reset feature will operate with any current flow
from minimum load (5 amps) to values below phase or
ground pickup levels.
Count Restraint
The count-restraint feature blocks the sectionalizer from
generating a count pulse as long as 0.5 amps of load
current flows through the sectionalizer.
Inrush-Current Restraint
The inrush-current restraint feature blocks the phase
and ground actuating levels for three seconds after
current flow through the sectionalizer has been
restored and the overcurrent has been determined to
be inrush current.
The three-second time interval allows for system inrush
parameters to stabilize prior to allowing the sensitivity of
the sectionalizer to return to its programmed state.
Response Time
For backfed motor contribution and unsymmetrical clear-
ing of upline faults, a response time is built into the sec-
tionalizer control to eliminate unwanted counting of
these situations. Upon detection of any current above
the phase or ground actuating setting, the current must
exceed the response time characteristics as illustrated in
Figure 4. Total clearing time of reclosers and breakers
must exceed the response time characteristics of the
sectionalizer.
Label Value
Resistance (ohms)
(amps)
Minimum
Maximum
Catalog Number
16
264
270
KA176GV16
24
172
176
KA176GV24
40
94.3
96.3
KA176GV40
56
66.3
67.7
KA176GV56
80
47
48
KA176GV80
112
32.6
33.4
KA176GV112
160
22.9
23.5
KA176GV160
224
16.3
16.7
KA176GV224
256
13.8
14.2
KA176GV256
296
11.9
12.3
KA176GV296
320
11.1
11.5
KA176GV320
448
8.1
8.3
KA176GV448
480
7.4
7.6
KA176GV480
640
5.5
5.7
KA176GV640
Table 3
Minimum Actuating Resistor (Phase)
Table 4
Minimum Actuating Resistor (Ground)
Label Value
Resistance (ohms)
(amps)
Minimum
Maximum
Catalog Number
3.5
6.91K
7.05K
KA177GV3
7
1.168K
1.192K
KA177GV7
16
379.0
387.0
KA177GV16
20
298.0
304.0
KA177GV20
28
200.0
204.0
KA177GV28
40
135.63
138.37
KA177GV40
56
94.3
96.3
KA177GV56
80
66.3
67.7
KA177GV80
112
47.0
48.0
KA177GV112
160
32.6
33.4
KA177GV160
224
22.9
23.5
KA177GV224
320
15.8
16.2
KA177GV320
BLOCK
0
0.1
KA177GVBLO
Type GWC Installation Instructions
6