Hitachi 670 Series Application Manual page 63
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- Applications manual (438 pages) ,
- Commissioning manual (284 pages) ,
- Product manual (192 pages)
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1MRK505382-UEN Rev. K
MaxtDiffLevel indicates the maximum time difference allowed between internal clocks in respective
line ends.
64 kbit mode specific settings
TransmCurr is used to select among the following:
•
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
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 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.
IEC07000235 V2 EN-US
Figure 57:
Communication set-up, 670/650 series
Application Guide
Setting example for AsymDelay
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Analog and binary signal transfer for line differential protection
GUID-4CBDD9D5-E3B1-4FD8-A510-9BD5363BACD1 v1
Section 4
57
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