setNLLcomp
ZKIIUU 1)03(
11
IEC15000059 V1 EN-US
Figure 51: Simplified offset mho characteristic and vector diagram for phase
L1-to-earth fault
Operation occurs if 90°≤β≤270°.
Offset mho
GUID-B1EF3931-7B86-4C7B-BCEA-3034482BA240 v2
The condition for operation of offset mho at phase-to-earth fault is that the angle β
between the two compensated voltages is equal to or greater than 90°, see figure
52. The angle will be 90° for fault location on the boundary of the circle.
11 1 1
arg ( 3 0 ) 1 arg ( 3 0 ) 1
LL Nset L L Nset
UIIKZ U IIKZ
IECEQUATION15022 V2 EN-US (Equation 12)
1MRK 505 394-UEN A Section 7
Impedance protection
Line differential protection RED650 2.2 IEC 131
Technical manual
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