Intertrip Scheme - ABB REL670 2.2 IEC Applications Manual

1MRK 506 369-UEN B
16.2.2.3
16.2.3
16.2.3.1
Line distance protection REL670 2.2 IEC
Application manual
set the tSendMin to zero in this case. There is no need to delay the trip at receive of
the carrier signal, so set the timer tCoord to zero.
Unblocking scheme
Unblocking scheme cannot be used at ZC1PPSCH as a failure of the
communication channel cannot give any information about which phase/phases
have a fault.

Intertrip scheme

In some power system applications, there is a need to trip the remote end breaker
immediately from local protections. This applies, for instance, when transformers
or reactors are connected to the system without circuit-breakers or for remote
tripping following operation of Breaker failure protection (CCRBRF).
In intertrip scheme, the carrier send signal is initiated by an underreaching zone or
from an external protection (transformer or reactor protection). At remote end, the
received signals initiate a trip without any further protection criteria. To limit the
risk for unwanted trip due to spurious sending of signals, the timer tCoord should
be set to 10-30 ms dependant on type and security of the 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 Phase segregated scheme communication logic for distance
protection function ZC1PPSCH are set via the local HMI or PCM600.
Configure the zones used for the CS carrier send and for scheme communication
tripping by using the Application Configuration tool. The recommended settings of
tCoord timer are based on maximal recommended transmission time for analog
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.
Permissive underreache scheme
Operation On
Set =
Scheme Permissive UR
Set =
type
tCoord
Set = 0 ms
Set tSendMin = 0.1 s
Section 16
Scheme communication
SEMOD141790-46 v2
SEMOD141790-49 v2
SEMOD141796-1 v1
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