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CT for zero-phase sequence current
(ii)
Regarding zero-phase sequence current†, the user can select a style among No.111–113. Find
a matching style and define it by setting [Conn-IeCT].
Table 5.4-3 Connection styles for CT for zero-phase sequence current
No.
Connection styles
111
Not to input
To input residual current
112
from secondary CT
To input current
from independent CT
113
(*)Core balance CT or
Tertiary CT etc.
†Note: In the IED operations, zero-sequence phase current "Ie" will be translated into the
below name and meaning in accordance with source origins:
3Io: residual zero-phase sequence current on secondary CT winding (No. 112) or
zero-phase sequence current on core balance CT winding (No. 113)
Io: zero-phase sequence current on tertiary CT winding (No. 113)
Setting [Conn-IeCT]
No use
Residual
(*)
Independent
- 634 -
Wiring examples
No current inputted to CT-Ie
Busbar
A B C
Residual current inputted to CT-Ie from
secondary CT
Busbar
A B C
Current inputted to CT-Ie from core balance CT
Busbar
A B C
Current inputted to CT-Ie from tertiary CT
Busbar
A B C
6F2T0207 (0.01)
7
Ie
--
8
7
Ie
3I
0
8
7
Ie
3I
0
8
7
Ie
I
0
8
GRE200 (5,6)
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