Instruction manual –AQ F210 Feeder Protection IED
260 (292
)
8
A
PPLICATIONS
8.1
3-
PHASE
,
3-
WIRE
ARON
INPUT CONNECTION EXAMPLE
In this chapter is presented a connection example of an application with only two installed
protection CTs. Connection is suitable for both motor –and feeder protection applications.
Figure 5.1.9-1 3-phase, 3-wire ARON input connection.
ARON input connection can measure load symmetrically despite the fact that one of the CTs is
missing from the installation. Normally the current transformer of phase two is without installed
CT since it is much more likely that external fault appears on line 1 or 3.
Fault between line 2 and ground cannot be detected when ARON input connection is used. For
detecting ground fault in phase two a cable core CT has to be used.