I.L. 40-386.3
(10/94)
3-13
GBT Curve
= Time curve dial setting (1 to 63).
T
0
, K, C, P and R are constants, and are shown in
T
able 3-1.
Taking the CO-8 curve set as an example
(see Figure 2-36)
, assuming that the maxi-
mum 3Io of unbalanced load is 0.2A, the minimum ground fault current for a fault two
buses away is 10A, and 0.7 seconds is required for coordination with current of 20
times the
GB Pickup
setting, then the settings of the ground overcurrent backup func-
tion should be as shown below:
10/2 >
GB Pickup
> 2 x 0.2 set
GB Pickup
= 0.5
Choosing from the curves, in
Figure 2-36,
for 0.7 seconds at 20 times the
GB Pickup
setting,
GBT Curve
should be set to 24. Set
GB Type
to
C0-8
and set
GB Dir
to
YES
if directional control is required.
3.3.25 Close-Into-Fault Trip Setting (CIF Trip)
Set
CIF Trip
setting by selecting the value field
Yes
if line side potential is used to sup-
ply the relay.
3.3.26 Load Loss Trip Setting (LL Trip)
Set
LL Trip
to YES, FDOG or NO, where:
YES–
LL Trip
trip with Z2 supervision.
FDOG–
LL Trip
with both Z2 and FDOG supervision.
NO–
LL Trip
function is not used.
3.3.27 Loss of Potential Block Setting (LOP Blk)
Set
LOP Blk
to
YES
, if loss-of-potential block trip function is required.
3.3.28 Loss of Current Block Setting (LOI Blk)
Set
LOI Blk
to
YES
, if loss-of-current block trip function is required.
3.3.29 Trip Alarm Setting (Trip Alm)
Set
Trip Alm
to
Seal-in
, if trip alarm seal-in is required. The front panel, reset push-
button can be used to reset the sealed alarm.
3.3.30 Remote Setting (Rem. Set)
Set the
Rem. Set
to
Remote Allowed
if remote setting (via communications port) is
required.
3.3.31 Real-Time Clock Setting
With REL 301/302 in the “setting” mode, scroll the function field to
Time Set
, and
change the value to
YES
. Depress function pushbutton RAISE to display Year, Month,
Day, Weekday, Hour, and Minute, and set the corresponding number via the value
Summary of Contents for REL 301
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Page 17: ...I L 40 386 3 1 10 10 94 2682F39 Sheet 1 of 2 Sub 2 Figure 1 2 REL 301 302 Layout Vertical...
Page 18: ...I L 40 386 3 10 94 1 11 2682F39 Sheet 2 of 2 Sub 2 Figure 1 3 REL 301 302 Layout Horizontal...
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Page 62: ...I L 40 386 3 10 94 2 41 Figure 2 32 CO 2 Curve Characteristics 619596 Sub 2...
Page 63: ...I L 40 386 3 2 42 10 94 Figure 2 33 CO 5 Curve Characteristic 619597 Sub 2...
Page 64: ...I L 40 386 3 10 94 2 43 Figure 2 34 CO 6 Curve Characteristic 619598 Sub 2...
Page 65: ...I L 40 386 3 2 44 10 94 Figure 2 35 CO 7 Curve Characteristic 619599 Sub 2...
Page 66: ...I L 40 386 3 10 94 2 45 Figure 2 36 CO 8 Curve Characteristic 619600 Sub 2...
Page 67: ...I L 40 386 3 2 46 10 94 Figure 2 37 CO 9 Curve Characteristic 619601 Sub 2...
Page 68: ...I L 40 386 3 10 94 2 47 Figure 2 38 CO 11 Curve Characteristic 619602 Sub 2...
