Permissive Underreaching Scheme - ABB REC670 Applications Manual

Section 15
Scheme communication
15.1.3.3
15.1.3.4
15.1.3.5
15.1.3.6
440
Unblock Off
Set =
(Set to
used.
Set to
tSecurity
Set = 0.035 s
DeltaI
Set = 10 %IB
DeltaU
Set = 5 %UB
Delta3I0
Set = 10 %IB
Delta3U0
Set = 5 %UB

Permissive underreaching scheme

Set Operation =
SchemeType
Set =
Set tCoord = 0 ms
tSendMin
Set = 0.1 s
Set Unblock =
tSecurity
Set = 0.035 s
Permissive overreaching scheme
Operation
Set =
Scheme type
Set =
tCoord
Set = 0 ms
tSendMin
Set = 0.1 s (0 s in parallel line applications)
Unblock
Set =
tSecurity
Set = 0.035 s
Unblocking scheme
Unblock Restart
Set =
(Loss of guard signal will give both trip and alarm
Choose
tSecurity
Set = 0.035 s
Intertrip scheme
Operation
Set =
SchemeType
Set =
tCoord
Set = 50 ms (10 ms + maximal transmission time)
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NoRestart if Unblocking scheme with no alarm for loss of guard is to be
Restart if Unblocking scheme with alarm for loss of guard is to be used)
On
Permissive UR
Off
On
Permissive OR
Off
NoRestart if only trip is required)
On
Intertrip
1MRK 511 401-UEN A
M13869-25 v4
M13869-34 v4
M13869-43 v4
M13869-62 v5
Bay control REC670 2.2 IEC
Application manual