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d.
The FDGT (FDOG trip delay timer) can be set from 0 to 15 cycles or block (BLK) as de-
sired. It is recommended to set to 3 cycles or longer. Refer to Section 3.9 for the detailed
FDGT information.
3.3.16 Distance/Overcurrent
Individual distance and overcurrent logic can be disabled, if required by the applica-
tion by setting the unit to Disabled:
a.
List of units which can be disabled:
Pilot Ø, Pilot G, Zone1 Ø, Zone1 G, Zone2 Ø, Zone2 G, Zone3 Ø, Zone3 G, Inst.
Ø, Inst. G and GB Type.
b.
Procedure to disable the unit:
Switch REL 301/302 to the setting mode (see section 4.4.2.1), scrolling the func-
tion field to the desired function. Then set the unit to Disabled.
3.3.17 Timers
a.
T1 Timer can be set from 0-15 cycle delay if Zone1 trip delay is required.
b.
The T2Ø Type, T2G Type, T3Ø Time and/or T3G Time timer functions can be disabled, if
desired, by setting the timer to Blocked. Timers set to Blocked, block output from the as-
sociated trip logic. For example, if T3Ø Time is set to Blocked Zone3 logic cannot produce
a trip output.
3.3.18 Zone3 Direction Setting (Zone3)
Zone3 Ø and Zone3 G can be selected to be forward-looking or reverse-looking by set-
ting the Zone3 (Zone3 forward or reverse setting) to Forward Dir. or Reverse Dir.
3.3.19 Positive Sequence Impedance Line Angle (Ang Pos.)*
Set the Positive Sequence Line Impedance Angle setting (Ang Pos.) to the value of the
positive sequence line impedance angle. From the example data (Section 3.2), the set-
ting would be Ang Pos. = 77
3.3.20 Zero Sequence Impedance Angle (Ang Zero)*
Set the Zero Sequence Impedance Angle setting (Ang Zero) to the value of the zero se-
quence line impedance angle. From the example data (Section 3.2), the setting would
be Ang Zero = 73
3.3.21 Zero Sequence/Positive Sequence Ratio (Z
Set the (Z
es. From the example data (Section 3.2), the setting would be Z
3.3.22 Low Voltage Settings (Low V)
The low voltage units are used in close into fault logic and weakfeed logic in the REL
301/302. Low V should normally be set to 40 volts unless a higher setting is required
for more sensitive applications.
(10/94)
o
.
o
.
/Z
) Value based on the absolute value of the ratio of the line impedanc-
OL
1L
/Z
)*
OL
1L
* See application note under Section 3.2.1
I.L. 40-386.3
/Z
= 3.3.
OL
1L
3-11
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