Configurations With Power Transformers In The Protected Zone; Line Differential Protection L3Cpdif, L6Cpdif, Lt3Cpdif, Lt6Cpdif; Power Transformers In The Protected Zone - ABB Relion 670 Series Application Manual

Section 4
Analog and binary signal transfer for line differential protection
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.
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

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
shown in Figure
IED
IEC05000442 V2 EN-US
Figure 25: One two–winding transformer in the protected zone
28
In order to forward the logic signals (for example, inter-trip or inter-block)
between IED-A and IED-C, the setting
LDCM313 for Ldcm312 and to LDCM312 for ldcm313.
B, it is set to
25 and Figure 26.
Protected zone
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LinkForwarded should be defined. In IED-
IED
IEC05000442-2-en.vsdx
Communication set-up, 670/650 series
1MRK 505 382-UEN E
M12541-6 v7
Application Guide