Basler Electric BE1-87T - Manual (Page 131)

9171300990 Rev V BE1-87T Setting Notes A-3
Setting Note 3
Assuming Z
1
=Z
2
,
φ
φφ
3
2
3 I
I × =
Phase 2 carries twice the fault current returning from the relay to the CTs. Therefore, the maximum current
is:
φ
φ
φφ
3
3
3
2
3
2
2
I I
I
I I
MAX
MAX
× =








× =
× =
Figure A-3. Phase-Phase Fault Delta Connected CTs
87T
2 I
I 3
2
1
I
2 I
I I
(0)
I
B
I
A
D2779-01
04-16-99