ABB REB650 - Page 104

PUREV
0.6 * IDirPU
PUFW
-RCA -85 deg
40% of
IDIR
IDIR
RCA
65 deg
Vpol = -V2
I = 3I
op 2
RCA +85 deg
RCA -85 deg
Characteristic
for PUREV
Operating area
Operating area
Characteristic
for PUFW
Characteristic for reverse
release of measuring steps
Characteristic for forward
release of measuring steps
-RCA +85 deg
ANSI11000269-2-en.ai
ANSI11000269 V2 EN
Figure 39: Operating characteristic for ground-fault directional element using the
negative sequence components
Two relevant setting parameters for directional supervision element are:
• Directional element will be internally enabled to operate as soon as Iop is bigger
than 40% of IDirPU and directional condition is fulfilled in set direction.
• Relay characteristic angle AngleRCA, which defines the position of forward and
reverse areas in the operating characteristic.
Directional comparison step, built-in within directional supervision element, will set
EF4PTOC (51N/67N) function output binary signals:
Section 7 1MRK 505 277-UUS C
Current protection
98
Technical Manual