ABB Relion 670 Series Applications Manual page 319

1MRK 511 407-UUS Rev. J
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 should be set such that the maximum through-fault current falls within this range.
Therefore,
When the
differential current during external fault.
Phasor measurement unit RES670
Application manual
CT-SUM transmits the sum of the two CT groups. CT-DIFF1
CompRange should be set to nearest value >/= √2* Maximum through-fault current.
CompRange is set below the maximum through-fault current, it can create false
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CT-DIFF2 transmits CT group 2 minus CT group 1.
Section 20
Remote communication
313