Reactor Winding, Solidly Grounded - ABB RELION RET670 Applications Manual

Section 7
Differential protection
7.3.2.4
180
including the HV side, the neutral connection and the LV side. The connection of
REFPDIF (87N) for this application is shown in figure 64.
I3PW1CT1
REFPDIF (87N)
I3PW2CT1
I3P
ANSI05000212 V4 EN-US
Figure 64: Connection of restricted ground fault, low impedance function
REFPDIF (87N) for an autotransformer, solidly grounded

Reactor winding, solidly grounded

Reactors can be protected with restricted ground fault protection, low impedance
function REFPDIF (87N). The connection of REFPDIF (87N) for this application is
shown in figure 65.
1MRK 504 163-UUS A
ANSI05000212-4-en.vsd
Transformer protection RET670 2.2 ANSI
Application manual
M13048-18 v10