ABB Relion 670 Series Applications Manual page 446

Section 16
Scheme communication
16.1.3 Setting guidelines
The parameters for the scheme communication logic function are set via the local HMI or
PCM600.
Configure the zones used for the CS send and for scheme communication tripping by using
the ACT configuration tool.
The recommended settings of
time for analogue channels according to IEC 60834-1. It is recommended to coordinate the
proposed settings with actual performance for the teleprotection equipment to get optimized
settings.
16.1.3.1 Blocking scheme
Operation
Set
Set
SchemeType
Set tCoord
tSendMin
Set
Set Unblock
tSecurity
Set
16.1.3.2 Delta blocking scheme
Operation
Set
SchemeType
Set
tCoord
Set
tSendMin
Set
Set Unblock
tSecurity
Set
DeltaI
Set
DeltaU
Set
Delta3I0
Set
Delta3U0
Set
16.1.3.3 Permissive underreaching scheme
Operation
Set
SchemeType
Set
tCoord
Set
tSendMin
Set
Unblock
Set
tSecurity
Set
440
tCoord timer are based on maximal recommended transmission
On
=
= Blocking
= 25 ms (10 ms + maximal transmission time)
= 0 s
= Off
NoRestart if Unblocking scheme with no alarm for loss of guard is to
(Set to
be used.
Set to Restart if Unblocking scheme with alarm for loss of guard is to be used)
= 0.035 s
On
=
DeltaBlocking
=
= 0 s
= 0 s
= Off
NoRestart if Unblocking scheme with no alarm for loss of guard is
(Set to
to be used.
Set to Restart if Unblocking scheme with alarm for loss of guard is to be
used)
= 0.035 s
= 10 %IB
= 5 %UB
= 10 %IB
= 5 %UB
On
=
Permissive UR
=
= 0 ms
= 0.1 s
Off
=
= 0.035 s
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