Reactor Winding, Solidly Earthed - ABB RELION 670 Series Applications Manual

Section 6
Differential protection
REFPDIF
I3PW1CT1
I3PW2CT1
IdN/I
IEC09000111-4-EN V2 EN-US
Figure 51:
6.3.2.4

Reactor winding, solidly earthed

Reactors can be protected with restricted earth-fault protection, low impedance function
REFPDIF. The connection of REFPDIF for this application is shown in figure 52.
138
I3P
Connection of restricted earth fault, low impedance function REFPDIF for an
autotransformer, solidly earthed
-
Auto
transformer
IEC09000111-4-EN.vsd
1MRK 504 152-UEN B
HV (W1)
LV (W2)
M13048-18 v10
Application manual