ABB SPAD 330 C - Application Examples; Transformer Vector Group Matching

10
Applications The biased differential relay SPAD 330 C used
for the winding short-circuit and interturn fault
protection of a YNd11 connected power trans-
Example 1.
former, when the current transformers have
“in-side” earthings, i.e. the current transformers
have the basic connection type I.
Switch SG1
10
21
30
40
50
60
∑ = 2
Setting of the matching of the power transformer
vector group:
P1
S2
P2 P1 P2
S1
S2
S1
L1
L2
L3
SPAD 330 C
..
SPAD 330 C