Hitachi Relion 670 Series Applications Manual page 289

1MRK506375-UEN Rev. N
The recommended settings of tCoord timer are based on maximal recommended transmission 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.
13.1.3.1 Blocking scheme
Set Operation
Set SchemeType
Set tCoord
Set tSendMin
Set Unblock
Set tSecurity
13.1.3.2 Permissive underreaching scheme
Set Operation
Set SchemeType
Set tCoord
Set tSendMin
Set Unblock
Set tSecurity
13.1.3.3 Permissive overreaching scheme
Set Operation
Set Scheme type
Set tCoord
Set tSendMin
Set Unblock
Set tSecurity
13.1.3.4 Unblocking scheme
Set Unblock
Set tSecurity
13.1.3.5 Intertrip scheme
Set Operation
Set SchemeType
Set tCoord
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Railway application RER670
Application manual
= On
= Blocking
= 25 ms (10 ms + maximal transmission time)
= 0 s
= 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)
= 0.035 s
= On
= Permissive UR
= 0 ms
= 0.1 s
= Off
= 0.035 s
= On
= Permissive OR
= 0 ms
= 0.1 s (0 s in parallel line applications)
= Off
= 0.035 s
= Restart
(Loss of guard signal will give both trip and alarm
Choose NoRestart if only trip is required)
= 0.035 s
= On
= Intertrip
= 50 ms (10 ms + maximal transmission time)
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Section 13
Scheme communication
M13869-8 v6
M13869-25 v4
M13869-34 v4
M13869-43 v4
M13869-62 v5
283