ABB REG650 - Page 206

STRV
0.6 * I>DIR
STFW
-RCA -85 deg
40% of
I>DIR
I>DIR
RCA
65 deg
U = -U
pol 2
I = I
op 2
RCA +85 deg
RC
A -85 deg
Characteristic
for STRV
Operating area
Operating area
Characteristic
for STFW
Characteristic for reverse
release of measuring steps
Characteristic for forward
release of measuring steps
-RCA +85 deg
IEC11000269-2-en.ai
IEC11000269 V2 EN
Figure 96: Operating characteristic for earth-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 I>Dir 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 function output binary signals:
1. STFW=1 when operating quantity magnitude Iop x cos(φ - AngleRCA) is bigger
than setting parameter I>Dir and directional supervision element detects fault in
forward direction.
2. STRV=1 when operating quantity magnitude Iop x cos(φ - AngleRCA) is bigger
than 60% of setting parameter I>Dir and directional supervision element detects
fault in reverse direction.
Section 8 1MRK 502 048-UEN A
Current protection
200
Technical manual