Hitachi 670 Series Application Manual page 46

Section 4
Analog and binary signal transfer for line differential protection
Setting example with two transformers in the protected zone (master-
slave differential operation)
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IEC13000295 V2 EN-US
Figure 40:
Setting
PDIF
NoOfUsedCTs
TraAOnInpCh
TraBOnInpCh
Protection functions in stations B and C operate as slaves (differential function switched off) so
currents are sent to protection function in station A, and received on channels 2 and 3. To inform the
differential algorithm that currents are coming from the LV sides of the transformers, TraAOnInpCh
must be set to 2 and TraBOnInpCh to 3 (channel1 is reserved for local measurement). This is to
ensure that proper turn ratio and vector group correction is done.
Setting example with a three-winding transformer in the protected zone
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IEC13000296 V2 EN-US
Figure 41:
40
A
Master- slave differential operation
Station A
L3TCPDIF
3
2
3
A
Three-winding transformer in the zone
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T
A
T
B
Station B Station C
T
T
1MRK505382-UEN Rev. K
B
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C
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IEC13000295-2-en.vsdx
B
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IEC13000296-1-en.vsdx
Communication set-up, 670/650 series
Application Guide