AngleRCA
Forward
Area
Iop = I2
Vpol=-V2
Reverse
Area
ANSI10000031-1-en.vsd
ANSI10000031 V1 EN
Figure 214: Operating characteristic for fault directional element
Two relevant setting parameters for directional supervision element are:
• Directional element is internally enable to operate as soon as I
Op
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
207 (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 207. (Operating quantity magnitude is bigger than 60% of setting
INDirPU)
1MRK505222-UUS C Section 7
Current protection
427
Technical reference manual
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