Setting Guidelines - ABB RER670 Applications Manual

Section 13
Scheme communication
13.1.3
13.1.3.1
13.1.3.2
348
In an intertrip scheme, the send signal is initiated by an underreaching zone or from
an external protection (transformer or reactor protection). At the remote end, the
received signals initiate a trip without any further protection criteria. To limit the
risk for an unwanted trip due to the spurious sending of signals, the timer tCoord
should be set to 10-30 ms dependant on the type of 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.

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 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.
Blocking scheme
Operation On
Set
SchemeType Blocking
Set
Set tCoord 25 ms (10 ms + maximal transmission time)
tSendMin
Set 0 s
Unblock Off
Set
(Set to
used.
Restart if Unblocking scheme with alarm for loss of guard is to be used)
Set to
tSecurity
Set 0.035 s
Permissive underreaching scheme
Operation
Set =
SchemeType
Set =
tCoord
Set = 0 ms
tSendMin
Set = 0.1 s
Unblock
Set =
tSecurity
Set = 0.035 s
NoRestart if Unblocking scheme with no alarm for loss of guard is to be
On
Permissive UR
Off
1MRK 506 375-UEN A
Railway application RER670 2.2 IEC
Application manual
IP15021-1 v1
M13869-4 v4
M13869-8 v5
M13869-25 v4