1½ breaker arrangement has two local currents, and the Current Transformer (CT) earthing for
those can differ.
CT-SUM
transmits the sum of the two CT groups.
CT-DIFF1
transmits CT
group 1 minus CT group 2 and
CT-DIFF2
transmits CT group 2 minus CT group 1.
CT-GRP1
and
CT-GRP2
transmit the respective CT groups, and setting
RedundantChannel
determines that the channel is used as a redundant backup channel. The redundant channel
takes the CT group setting of the main channel.
RemAinLatency
corresponds to
LocAinLatency
set in the remote IED.
AnalogLatency
specifies the time delay (number of samples) between actual sampling and the
time the sample reaches LDCM. The value is set to 2 when transmitting analog data. When a
merging unit according to IEC 61850-9-2 is used instead of the TRM, this parameter shall be
set to 5.
CompRange
value indicates the current peak value over which truncation is made. To set this
value, knowledge of fault current levels is required. It is recommended to set the minimum
range that will cover the expected fault current value. For example, if a 40kA fault level is
expected on the network, the 0-50kA settings range should be chosen.
2 Mbit mode specific settings
RedundantCh
is used to set the channel as a redundant backup channel. The redundant
channel takes the CT group setting of the main channel, and ignores the CT group configured
in its own transmit block.
LinkForwarded
is used to configure the LDCM to merge the inter-trip and block signals from
another LDCM-receiver. This is used when the analog signals for the LDCM-transmitter is
connected to the receiver of another LDCM.
Section 18 1MRK 505 370-UEN D
Remote communication
426 Busbar protection REB670
Application manual
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