IEC14000047 -1-en.ai
IEC14000047 V1 EN-US
Figure 66: Selectivity chart
Setting example for two transformers in the zone, Master- Slave differential operation
IEC13000295-1-en.vsd
A
B
C
T
T
IEC13000295 V1 EN-US
Figure 67: Master- Slave differential operation
Settings
Station A
Station B
Station C
PDIF
L3TC PDIF
NoOfUsedCTs
3
TraAOnInpCh
2
TraBOnInpCh
3
The protection at B and C are operating as Slaves (differential function switched off) and the
currents are sent to the protection at A and received on channel 2 and 3. To inform the
differential algorithm that the currents are from the low voltage sides of the transformers,
TraAOnInpCh has to set to 2 and TraBOnInpCh to 3 (channel1 is reserved for local
measurement) so that the proper turn ratio and vector group correction can be done.
Setting example for three-winding transformer in the zone
Section 6
1MRK 505 343-UEN B
Differential protection
140
Application manual
Summary of Contents for Relion 670 series
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