supervision element and the integrated directional comparison
function.
The operating and polarizing quantity are then used inside the directional element,
as shown in figure 51, to determine the direction of the fault.
AngleRCA
Forward
Area
Iop = I2
Upol=-U2
Reverse
Area
IEC10000031-1-en.vsd
IEC10000031 V1 EN-US
Figure 51: 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:
1MRK 505 384-UEN A Section 6
Current protection
Breaker protection REQ650 2.2 IEC 137
Technical manual
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