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Example 5.
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
14
P2
P1
S2
S1
Setting of the matching of the power transformer
vector group:
have "inside and outside" earthings, i.e . the
current transformers have the basic connection
type II.
P2
P1
S2
S1
Switch
1
2
3
4
5
6
L1
L2
L3
SG1
0
1
1
0
0
0
∑ = 6
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