ABB Relion 670 series Applications Manual

Set Unblock = Disabled
(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 DeltaV = 5 %VB
Set Delta3I0 = 10 %IB
Set Delta3V0 = 5 %VB
16.1.3.3 Permissive underreaching scheme
Set Operation = Enabled
Set SchemeType = Permissive UR
Set tCoord = 0 ms
Set tSendMin = 0.1 s
Set Unblock = Disabled
Set tSecurity = 0.035 s
16.1.3.4 Permissive overreaching scheme
Set
Operation = Enabled
Set Scheme type = Permissive OR
Set tCoord = 0 ms
Set tSendMin = 0.1 s (0 s in parallel line applications)
Set Unblock = Disabled
Set tSecurity = 0.035 s
16.1.3.5 Unblocking scheme
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
1MRK 506 369-UUS - Section 16
Scheme communication
Line distance protection REL670 2.2 ANSI 755
Application manual

ABB Relion 670 series Specifications

General

Brand	ABB
Model	Relion 670 series
Category	Protection Device
Language	English