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I.L. 40-386.4
3.3.14
System Type Selection ("SystType")
"SystType" selects the desired relaying system for the application. REL 301 has two setting
choices: "Non Pilot" and "Zone-1 Extension". REL 302 has five setting choices: "Non Pilot",
"Zone-1 Extension", "POTT" (permissive overreach transfer trip), "PUTT" (permissive
underreach transfer trip) and "Blocking" (directional comparison blocking).
3.3.15
For The Pilot REL 302 Only
a.
"3-Term.", 3- terminal line configuration setting, should be set to "Yes" for all three terminal
line applications.
b.
"Weakfeed" (weakfeed terminal logic enable) selection should be set to "Yes" for all weak-
feed terminal applications.
c.
For applications of "POTT" or "Blocking", systems, the transient block logic is always au-
tomatically enabled and is initiated by the reverse looking units. Set "Zone-3" to "Reverse
Dir." and "Zone-3 Ø" and "Zone-3 G" should be set to 100% of the reverse line
impedance.
d.
The "FDOGTime" (FDOG trip delay timer) can be set from "0" to "15 cycles" or
"Blocked" as desired. It is recommended to set "FDOGTime" to 3 cycles or longer. Refer
to Section 2.5.2 for the detailed information.
3.3.16
Distance/Overcurrent
Individual distance and overcurrent logic can be disabled, if required by the application by set-
ting the unit to "Disabled":
a.
List of units which can be disabled:
"Pilot Ø", "Pilot G", "Zone-1 Ø", "Zone-1 G", "Zone-2 Ø", "Zone-2 G", "Zone-3 Ø",
"Zone-3 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), scrolling the function field to
the desired function. Then set the unit to "Disabled".
3.3.17
Step Distance Timers
a.
"T1 Timer" can be set from 0-15 cycle delay and cannot be disabled.
b.
The "T2Ø Type", "T2G Type", "T3Ø Time" and/or "T3G Time" timer functions can be dis-
abled, if desired, by setting the timer to "Blocked". Timers set to "Blocked", block output
from the associated trip logic. For example, if "T3Ø Time" is set to "Blocked" Zone- 3 logic
will not produce a trip output.
3.3.18
Zone-3 Direction Setting ("Zone-3")
"Zone-3 Ø" and "Zone-3 G" can be selected to be forward-looking or reverse-looking by set-
ting the "Zone-3" (Zone-3 forward or reverse setting) to "Forward Dir." or "Reverse Dir."
3-12
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