6.4.2.1 Distance protection zones ZGCPDIS
Keep the current constant when measuring operating characteristics. Keep the current
as close as possible to its rated value or lower. But make sure it is higher than 30% of
the rated current.
Ensure that the maximum continuous current in an IED does not exceed four times its
rated value, if the measurement of the operating characteristics runs under constant
voltage conditions.
To verify the mho characteristic, at least two points must be tested.
6.4.2.2 Phase-to-phase faults
jX
R
Ohm/phase
ImpedanceAng
ZxFwd
ZxRev
P1
P2P3
P4
Midpoint of circle
IEC09000173_2_en.vsd
IEC09000173 V2 EN
Figure 11: Proposed four test points for phase-to-phase fault
Label
Description
ZxFwd Forward positive sequence impedance setting for zone x (where x is 1- 3 depending on
the zone selected).
ZxRev Reverse positive sequence impedance setting for zone x (where x is 1- 3 depending on
the zone selected).
ImpedanceAng The Impedance angle for phase-to-phase fault in degrees.
Section 6 1MRK 502 049-UEN A
Testing functionality
52
Commissioning manual
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