Chapter 6 - Current Protection Functions
where:
I
= Minimum fault current expected for the remote fault
●
F
●
I> = Phase current setting for the element to have VCO control
Example
If the overcurrent device has a setting of 160% In, but the minimum fault current for the remote fault condition is
only 80% In, then the required k factor is given by:
0 8
.
k =
=
0 42
×
1 6 1 2
.
.
The voltage threshold, Vdep OC V< setting would be set below the lowest system voltage that may occur under
normal system operating conditions, whilst ensuring correct detection of the remote fault.
108
.
P14x
P14xEd1-TM-EN-1