supervision element and the integrated directional comparison
function.
The operating and polarizing quantity are then used inside the directional element, as
shown in figure
, to determine the direction of the fault.
AngleRCA
Forward
Area
Iop = I2
Upol=-U2
Reverse
Area
IEC10000031-1-en.vsd
IEC10000031 V1 EN
Figure 172:
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 Iop is bigger than
40% of
I>Dir
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 output binary signals:
1MRK502052-UEN B
Section 8
Current protection
385
Technical manual
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