Permissive Underreaching Scheme - ABB RELION 670 SERIES Applications Manual

1MRK 506 369-UUS -
16.1.3.3
16.1.3.4
16.1.3.5
Line distance protection REL670 2.2 ANSI
Application manual
Unblock Disabled
Set =
(Set to
used.
Set to
tSecurity
Set = 0.035 s
Set DeltaI = 10 %IB
DeltaV
Set = 5 %VB
Delta3I0
Set = 10 %IB
Delta3V0
Set = 5 %VB

Permissive underreaching scheme

Operation Enabled
Set =
Set SchemeType = Permissive UR
tCoord
Set = 0 ms
tSendMin
Set = 0.1 s
Unblock Disabled
Set =
Set tSecurity = 0.035 s
Permissive overreaching scheme
Operation Enabled
Set =
Scheme type Permissive OR
Set =
tCoord
Set = 0 ms
Set tSendMin = 0.1 s (0 s in parallel line applications)
Set Unblock = Disabled
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
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)
NoRestart if only trip is required)
Section 16
Scheme communication
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