Setting Guidelines; Blocking Scheme; Delta Blocking Scheme - ABB Relion REC670 Applications Manual

Section 14
Scheme communication
sending of signals, the timer
communication channel.
The general requirement for teleprotection equipment operating in intertripping applications
is that it should be very secure and very dependable, since both inadequate security and
dependability may cause unwanted operation. In some applications the equipment shall be
able to receive while transmitting, and commands may be transmitted over longer time period
than for other teleprotection systems.
14.1.3

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.
14.1.3.1

Blocking scheme

Operation
Set
SchemeType
Set
tCoord
Set
tSendMin
Set
Unblock
Set
tSecurity
Set
14.1.3.2

Delta blocking scheme

Set Operation
SchemeType
Set
Set tCoord
tSendMin
Set
Set Unblock
tSecurity
Set
DeltaI
Set
Set DeltaU
Delta3I0
Set
Set Delta3U0
346
tCoord should be set to 10-30 ms dependant on type of
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
(Set to
to be used.
Restart if Unblocking scheme with alarm for loss of guard is to be
Set to
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
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Application manual