ABB RELION 670 SERIES REG670 - Autotransformer Winding, Solidly Grounded; Reactor Winding, Solidly Grounded

7.4.2.3 Autotransformer winding, solidly grounded
M13048-13 v9
Autotransformers can be protected with the low impedance restricted ground fault
protection function REFPDIF
. The complete transformer will then be protected
including the HV side, the neutral connection and the LV side. The connection of
REFPDIF (87N) for this application is shown in figure
74.
I3P
I3PW1CT1
I3PW2CT1
REFPDIF (87N)
ANSI05000212-4-en.vsd
ANSI05000212 V4 EN-US
Figure 74: Connection of restricted ground fault, low impedance function
REFPDIF (87N) for an autotransformer, solidly grounded
7.4.2.4 Reactor winding, solidly grounded
M13048-18 v10
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
75.
1MRK 502 071-UUS A Section 7
Differential protection
Generator protection REG670 2.2 ANSI and Injection equipment REX060, REX061, REX062 189
Application manual