IEC15000451-2-en.vsdx
IED
IED
A
B
T
T
Prot ected zone
IEC15000451 V2 EN-US
Figure 29: One three–winding transformer in the protected zone
4.6.2
Line differential protection L4CPDIF
4.6.2.1
Possible configurations
GUID-566BF5F0-3E2D-42D8-9D53-BCAFB7F0BEA9 v2
The simplest and most common configuration is the protection of a conventional two-end
power line (see Figure
). Circuit breakers (CBs) at both ends can be included in the protected
zone depending on their positions relative to the current transformers (CTs).
IEC05000039-3-en.vsd
Protected zone
Communication channel
IED
IED
IEC05000039 V3 EN-US
Figure 30: Two-end power line with one CB and one CT group at each end
It is also possible to protect a two-end power line that has two CB and CT groups at one end
and one CB and CT group at the other end (see Figure
). All currents from the three CTs must
be fed separately to L4CPDIF which processes the measured currents independently from each
other. Summing up the CTs’ secondary currents at the end with two CB and CT groups is not
allowed. CBs at both ends can be included in the protected zone depending on their positions
relative to the CTs.
IEC15000459-1-en.vsd
IEC15000459 V1 EN-US
Figure 31: Two-end power line with two CB and CT groups at one end
If there are two CB and CT groups at both ends of a two-end power line, information on
currents must be fed to all four current inputs of both IEDs. Current values at the remote end
are obtained via a communication channel as shown in Figure
secondary currents at the end with two CB and CT groups is not allowed. CBs at both ends can
be included in the protected zone depending on their positions relative to the CTs.
Section 4
1MRK 505 382-UEN E
Analog and binary signal transfer for line differential protection
30
Communication set-up, 670/650 series
Application Guide
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Summary of Contents for Relion 670 series
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