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prolonged. To secure correct operations of current reversal logic in case of parallel lines, when
applied, the carrier send signal CS shall not be prolonged. So 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
SEMOD141790-46 v2
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.
15.2.2.3
Intertrip scheme
SEMOD141790-49 v2
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.
15.2.3
Setting guidelines
SEMOD141796-1 v1
SEMOD141800-4 v2
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.
15.2.3.1
Permissive underreache scheme
SEMOD141800-6 v1
Set
Operation
=
On
Set
Scheme
type
=
Permissive UR
Set
tCoord
= 0 ms
Set
tSendMin
= 0.1 s
15.2.3.2
Permissive overreach scheme
SEMOD141800-9 v1
Set
Operation
=
On
Set
Scheme
type
=
Permissive OR
Set
tCoord
= 0 ms
Set
tSendMin
= 0.1 s
1MRK 505 343-UEN B
Section 15
Scheme communication
609
Application manual
Содержание Relion 670 series
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