ABB 615 series Technical Manual page 340

Section 4
Protection functions
334
Min trip current
Max reverse angle
Backward tripping zone
Min reverse angle
GUID-7F29880D-18AB-4B4C-9953-6D186760D35A V1 EN
Figure 153: Definition of the relay characteristic angle, RCA=+60 degrees in a solidly
grounded network
Example 3
The "Phase angle" mode is selected, isolated network (φRCA = -90 deg)
=> Characteristic angle = -90 deg
-VG (polarizing

quantity)
Characteristic angle
= +60 deg
Min forward angle
IG (tripping quantity)
Max forward angle
Forward tripping zone
zero torque line
1MAC059074-MB A
maximum torque line
615 series ANSI
Technical Manual