7.5.5 Settings
Table 80: LEPDIS Group settings (basic)
Name
Values (Range) Unit Step Default Description
RLd 0.05 - 3000.00 ohm/p 0.01 1.00 Load resistive reach in ohm/phase
ArgLd 5 - 85 Deg 1 38 Load encroachment inclination of load
angular sector
Table 81: LEPDIS Non group settings (basic)
Name Values (Range) Unit Step Default Description
GlobalBaseSel 1 - 6 - 1 1 Selection of one of the Global Base Value
groups
7.5.6 Operation principle
The basic impedance algorithm for the operation of Load encroachment LEPDIS is
the same as for the distance zone measuring function. LEPDIS includes three
impedance measuring loops intended for phase-to-phase as well as for three-phase
faults.
The difference compared to the distance zone measuring function is in the
combination of measuring quantities (currents and voltages) for different types of
faults.
The current start condition STCNDLE is based on the following criteria:
1. Residual current criteria
2. Load encroachment characteristic
The STCNDLE output is non-directional.
7.5.6.1 Load encroachment
Each of the three measuring loops has its own load encroachment characteristic based
on the corresponding loop impedance. The load encroachment functionality is always
active but can be switched off by selecting a high setting.
The outline of the characteristic is presented in figure
85. As illustrated, the resistive
blinders and the angle of the sectors are the same in all four quadrants.
Section 7 1MRK 502 048-UEN A
Impedance protection
174
Technical manual
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