ABB Relion 670 series - IED (Intelligent Electronic Device)

4.2.4.7 Example on how to connect a neutral point VT to the IED
Figure 25 gives an example on how to connect a neutral point VT to the IED. This type of
VT connection presents secondary voltage proportional to V
0
to the IED.
In case of a solid ground fault in high impedance grounded or ungrounded systems the
primary value of V
0
voltage will be equal to:
0
3
ph ph
ph Gnd
V
V V
-
-= =
EQUATION1932 V2 EN (Equation 11)
Figure 25 gives an overview of required actions by the user in order to make this
measurement available to the built-in protection and control functions within the IED.
Section 4 1MRK 506 369-UUS -
Analog inputs
96 Line distance protection REL670 2.2 ANSI
Application manual