ABB REL670 2.2 IEC, Applications Manual

Page: 714 / 908

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