ABB Relion 670 Series Applications Manual page 559

1MRK 511 401-UUS F
• one of the two possible local currents is transmitted
• sum of the two local currents is transmitted
• channel is used as a redundant backup channel
breaker-and-a-half arrangement has two local currents, and the Current Transformer (CT)
grounding for those can differ.
transmits CT group 1 minus CT group 2 and
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.
Bay control REC670
Application manual
CT-SUM transmits the sum of the two CT groups. CT-DIFF1
CT-DIFF2 transmits CT group 2 minus CT group 1.
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Section 21
Remote communication
553