ABB RELION REX640 Technical Manual page 471

1MRS759142 F
operating
Figure 268: Phase angle 80 amplitude ( Directional mode = Forward)
Phase angle 88
The operation criterion phase angle 88 is selected with the
using the value "Phase angle 88".
Phase angle 88 implements the same functionality as the phase angle but with the
following differences:
• The
have a fixed value of 88 degrees
• The sector limits of the fixed sectors are rounded.
Sector rounding in the phase angle 88 consists of three parts.
• If the current amplitude is between 1...20 percent of the nominal current, the
sector limit increases linearly from 73 degrees to 85 degrees
• If the current amplitude is between 20...100 percent of the nominal current, the
sector limit increases linearly from 85 degrees to 88 degrees
• If the current amplitude is more than 100 percent of the nominal current, the
sector limit is 88 degrees.
REX640
Technical Manual
Min forward angle
Non-
zone
-90 -75 -60
Max forward angle and Max reverse angle settings cannot be set but they
There is no sector rounding on the other side of the sector.
Io / % of I
n
10
9
8
7
6
Operating zone
4
3
2
1
-45 -30 -15 0 15 30
Protection functions
80 deg
3% of In
70 deg
1% of In
45 60 75 90
Operation mode setting
471