1.
Ldcm312 transmitter sends the local currents and the three currents received by Ldcm313.
2.
Ldcm313 transmitter sends the three local currents and the three currents received from
Ldcm312.
As a result, six currents are received in IED-A and IED-C. These currents can be connected to
the protection function together with the local three currents.
In order to forward the logic signals (for example, inter-trip or inter-block)
between IED-A and IED-C, the setting
LinkForwarded should be defined. In IED-
B, it is set to
LDCM313 for Ldcm312 and to LDCM312 for ldcm313.
This setup results in a master-master-master configuration, but without the benefit of
reverting to a slave-master-slave configuration in case of a communication link interruption. In
case of a communication link interruption, all three IEDs would be blocked.
4.6
Configurations with power transformers in the
protected zone
4.6.1
Line differential protection L3CPDIF, L6CPDIF, LT3CPDIF,
LT6CPDIF
4.6.1.1
Power transformers in the protected zone
M12541-6 v7
One three-winding transformer or two two-winding transformers can be included in the line
protection zone. The alternative with one two-winding transformer in the protected zone is
and Figure
IED
IED
Protected zone
IEC05000442-2-en.vsdx
IEC05000442 V2 EN-US
Figure 25: One two–winding transformer in the protected zone
Section 4
1MRK 505 382-UEN E
Analog and binary signal transfer for line differential protection
28
Communication set-up, 670/650 series
Application Guide
© Copyright 2017 ABB. All rights reserved
Summary of Contents for Relion 670 series
Page 1: ...Relion 670 650 SERIES Communication set up 670 650 series Version 2 2 Application Guide...
Page 2: ......
Page 10: ...4...
Page 99: ...93...
