U
1
/ U
2
Y
C
stat
R
N
+
U
inj
-
I
inj
R
d
a
b
N
d
R
U
U
R
×
÷
÷
ø
ö
ç
ç
è
æ
>>
2
2
1
IEC11000011-3-en.vsd
Y
Y
IEC11000011 V1 EN
Figure 139:
Injection via open delta VT connection
It must be observed that the resistor
R
d
is normally applied for ferro-resonance
damping. The resistance
R
d
is will have very little contribution to the earth fault
current as it has high resistance. This injection principle can be used for applications
1MRK502052-UEN B
Section 7
Impedance protection
309
Technical manual
Summary of Contents for Relion REG670
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