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

1MRK505382-UEN Rev. K
GUID-4051693B-04FA-4C97-8D56-721BE91FC90C V1 EN-US
The ACT part for station B and station C must include the two 3-phase groups of received current.
The first group (CH 1-3) is for the current measured at station A received through the communication
link between stations (A-B and A-C). The second group (CH4-CH6) is for the current received
through the link forward feature. The number of CT used for the line differential protection function
must be set to 3 at all stations. Remote tripping is always included in the data used for link forward.
No configuration is required.
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
and Figure 27.
IED
IEC05000442 V2 EN-US
Figure 26:
Communication set-up, 670/650 series
Application Guide
One two–winding transformer in the protected zone
© 2017 - 2023 Hitachi Energy. All rights reserved
Analog and binary signal transfer for line differential protection
Protected zone
Section 4
M12541-6 v7
IED
IEC05000442-2-en.vsdx
26
29