Toshiba GR-200 Series Instruction Manual page 537

CT for zero-phase sequence current for SEF
(iii)
Regarding zero-phase sequence current† for SEF‡, the user can select a style among No.121–
122. Find a matching style and define it by setting [Conn-IseCT].
Table 5.4-4 Connection styles for CT for zero-phase current for SEF
No. Connection styles
121 Not to input
To input current
122 from core balance CT or
tertiary CT etc.
†Note: In the IED operations, zero-sequence phase current "Ise" will be translated into
the below name and meaning in accordance with the source origin:
3Io: zero-phase sequence current on core balance CT winding (No. 122)
Io: zero-phase sequence current on CT tertiary winding (No. 122)
Chapter Relay application: Sensitive earth fault protection
‡Note: See
Setting
[Conn-IseCT]
No current inputted to CT-Ise
No use
Current inputted to CT-Ise from core balance CT
Use
Current inputted to CT-Ise from CT tertiary
- 518 -
6F2T0200 (0.15)
Wiring examples
Busbar
A B C
7
8
Busbar
A B C
7
8
Busbar
A B C
7
8
(→p. 69)
GRE200 (1,2)
Ise
--
Ise
3I
0
Ise
I
0