Sel 751A - Table 4.27 Reclosing Control Settings; Open Interval Timers

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Date Code 20100129 Instruction Manual SEL-751A Relay
Protection and Logic Functions
Reclose Logic
Reclosing Control
Settings
The reclosing control settings are shown in Table 4.27:
The operation of open interval timers is affected by SEL
OGIC control equation
settings discussed later in this section.
Open Interval Timers
The reclose enable setting, E79, determines the number of open interval time
settings that can be set. For example, if setting E79 := 3, the first three open
interval time settings in Table 4.27 , are made available for setting.
If an open interval time is set to zero, then that open interval time is not
operable, and neither are the open interval times that follow it.
In the factory settings in Table 4.27, the open interval 2 time setting 79OI2 is
the first open interval time setting set equal to zero:
79OI2 := 0.00 seconds
Thus, open interval times 79OI2, 79OI3, and 79OI4 are not operable. In the
factory settings, both open interval times 79OI3 and 79OI4 are set to zero. But
if the settings were:
79OI2 := 0.00 seconds
79OI3 := 15.00 seconds (set to some value other than zero)
open interval time 79OI3 would still be inoperative, because a preceding open
interval time is set to zero (i.e., 79OI2 := 0.00).
Table 4.27 Reclosing Control Settings
Setting Prompt Setting Range
Setting Name :=
Facto ry Defau lt
ENABLE RECLOSER OFF, 1–4 Shots E79 := OFF
OPEN INTERVAL 1 0.00–3000.00 secs 79OI1 := 5.00
OPEN INTERVAL 2 0.00–3000.00 secs 79OI2 := 0.00
OPEN INTERVAL 3 0.00–3000.00 secs 79OI3 := 0.00
OPEN INTERVAL 4 0.00–3000.00 secs 79OI4 := 0.00
RST TM FROM RECL 0.00–3000.00 secs 79RSD := 15.00
RST TM FROM LO 0.00–3000.00 secs 79RSLD := 5.00
RECLS SUPV TIME OFF, 0.00–3000.00 secs 79CLSD := 0.00
RECLOSE INITIATE SV 79RI := TRIP
RCLS INIT SUPVSN SV 79RIS := 52A OR 79CY
DRIVE-TO-LOCKOUT SV 79DTL := OC OR SV04T
DRIVE-TO-LSTSHOT SV 79DLS := 79LO
SKIP SHOT SV 79SKP := 0
STALL OPN INTRVL SV 79STL := TRIP
BLOCK RESET TMNG SV 79BRS := TRIP
SEQ COORDINATION SV 79SEQ := 0
RCLS SUPERVISION SV 79CLS := 1