ABB REL670 2.2 IEC - Permissive Underreaching Scheme

Set Unblock = Off
(Set to NoRestart if Unblocking scheme with no alarm for loss of guard is to be
used.
Set to
Restart if Unblocking scheme with alarm for loss of guard is to be used)
Set
tSecurity = 0.035 s
Set DeltaI = 10 %IB
Set DeltaU = 5 %UB
Set Delta3I0 = 10 %IB
Set Delta3U0 = 5 %UB
16.1.3.3 Permissive underreaching scheme
M13869-25 v4
Set Operation = On
Set SchemeType = Permissive UR
Set tCoord = 0 ms
Set tSendMin = 0.1 s
Set Unblock = Off
Set tSecurity = 0.035 s
16.1.3.4 Permissive overreaching scheme
M13869-34 v4
Set
Operation = On
Set Scheme type = Permissive OR
Set tCoord = 0 ms
Set tSendMin = 0.1 s (0 s in parallel line applications)
Set Unblock = Off
Set tSecurity = 0.035 s
16.1.3.5 Unblocking scheme
M13869-43 v4
Set
Unblock = Restart
(Loss of guard signal will give both trip and alarm
Choose NoRestart if only trip is required)
Set
tSecurity = 0.035 s
16.1.3.6 Intertrip scheme
M13869-62 v5
Set
Operation = On
Set SchemeType = Intertrip
Set tCoord = 50 ms (10 ms + maximal transmission time)
Table continues on next page
Section 16 1MRK 506 369-UEN B
Scheme communication
708 Line distance protection REL670 2.2 IEC
Application manual