Application Configuration Act - Hitachi 670 Series Application Manual

Section 4
Analog and binary signal transfer for line differential protection
As depicted in
The measured current is still exchanged between terminals B and C despite the absence of a
communication link between the two ends. LDCM modules at terminal A handing the current
exchange between terminals B and C.
Setting and configuration for link forward features in the above example:
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Figure 25:
Set value for LDCM modules:
Station A: Set LDCM 305 to forward the received current from station C to station B.
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Station A: Set LDCM 306 to forward the received current from station B to station C.
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4.5.1

Application configuration ACT

Station A: cross connect the received current to LDCMTRN function:
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28
Figure 25, three-line ends application with a reduced number of communication links.
Station A
Communication links
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Station B
Station C
Communication set-up, 670/650 series
1MRK505382-UEN Rev. K
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Application Guide