ABB RELION 650 SERIES, Technical Manual

Page: 221 / 942

supervision element and the integrated directional comparison
function.
The operating and polarizing quantity are then used inside the directional element,
as shown in figure
100 , 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 100: 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 506 382-UEN A
Section 7
Current protection
Line distance protection REL650 2.2 IEC 215
Technical manual