ABB RELION 620 Series Technical Manual page 212

Section 4
Protection functions
206
Min operate
current
Max reverse angle
GUID-D72D678C-9C87-4830-BB85-FE00F5EA39C2-ANSI V1 EN
Figure 90: 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
- V (polarizing quantity)
0
Characteristic angle
= +60 deg
Min forward angle
Max forward angle
Min reverse angle
zero torque line
1MAC504801-IB E
maximum torque line
I (operating quantity)
0
620 series ANSI
Technical Manual