ABB Relion 670 Series Applications Manual page 464
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- Technical manual (1432 pages) ,
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Section 18
Remote communication
•
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. 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 should be set such that the maximum through-fault current falls within this range. Therefore,
CompRange should be set to nearest value >/= √2* Maximum through-fault current. When the
CompRange is set below the maximum through-fault current, it can create false differential current during
external fault.
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1MRK 505 370-UUS Rev. K
Busbar protection REB670
Application manual
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