AngleRCA
Forward
Area
Iop = I2
Vpol=-V2
Reverse
Area
ANSI10000031-1-en.vsd
ANSI10000031 V1 EN-US
Figure 262: Operating characteristic for fault directional element
Two relevant setting parameters for directional supervision element are:
• Directional element is internally enable to trip as soon as Iop is bigger than 40% of
INDirPU
and the 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, set NS4PTOC (4612)
output binary signals:
1. PUFW=1 when tip of I2 phasor (operating quantity magnitude) is in forward area, see fig
262
(Operating quantity magnitude is bigger than setting
INDirPU
)
2. PUREV=1 when tip of I2 phasor (operating quantity magnitude) is in the reverse area, see fig
262. (Operating quantity magnitude is bigger than 60% of setting
INDirPU
)
These signals must be used for communication based fault teleprotection communication
schemes (permissive or blocking).
Simplified logic diagram for directional supervision element with integrated directional
comparison step is shown in figure
263:
Section 8 1MRK 502 066-UUS B
Current protection
502
Technical manual
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