ABB SPAD 330 C - Page 14

14
Biased differential relay SPAD 330 C used for
the winding short-circuit and interturn fault
protection of a Dyn11 connected power
transformer, when the current transformers
Example 5. have “inside and outside” earthings, i.e . the
current transformers have the basic connection
type II.
Switch SG1
10
21
31
40
50
60
∑ = 6
Setting of the matching of the power transformer
vector group:
SPAD 330 C
SPAD 330 C
P1
S2
P2
S1
P2 P1
S1S2
L1
L2
L3
SPAD 330 C