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PUREV
0.6 * IDirPU
PUFW
-RCA -85 deg
40% of
IDIR
IDIR
RCA
65 deg
V
pol = -
V
2
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 40:
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 6
1MRK 511 287-UUS A
Current protection
112
Technical manual
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