Application - ABB 615 series Technical Manual

1MAC059074-MB A
4.2.4.6
615 series ANSI
Technical Manual
TRIP
Susceptance forward
TRIP
Susceptance reverse
Conductancereverse
GUID-5BF18732-8375-40EE-B64A-73D44D04B906 V1 EN
Figure 187: Combined non-directional overconductance and non-directional
oversusceptance characteristic
The non-directional overconductance and non-directional
oversusceptance characteristic provides a good sensitivity and selectivity
when the characteristic is set to cover the total admittance of the protected
feeder with a proper margin.
The sign of the admittance characteristic settings should be considered
based on the location of characteristic boundary in the admittance plane.
All forward-settings are given with positive sign and reverse-settings with
negative sign.

Application

Admittance-based ground-fault protection provides a selective ground-fault protection
for high-resistance grounded, ungrounded and compensated networks. It can be applied
for the protection of overhead lines as well as with underground cables. It can be used as
Im(Yo)
Conductance tilt Ang >0
Conductance forward
Section 4
Protection functions
TRIP
Susceptance tilt Ang <0
Re(Yo)
TRIP
393