
7.5.2
Functionality
Heavy load transfer is common in many power networks and may make fault resistance
coverage difficult to achieve. In such a case, Load encroachment LEPDIS function can be
used to prevent operation of the of the underimpedance measuring zones during heavy
loads.
Each of the three measuring phase-to-phase loops has its own load encroachment
characteristic.
7.5.3
Function block
LEPDIS
I3P*
V3P*
BLOCK
DLECND
ANSI10000119-1-en.vsd
ANSI10000119 V1 EN
Figure 84:
LEPDIS function block
7.5.4
Signals
Table 78:
LEPDIS Input signals
Name
Type
Default
Description
I3P
GROUP
SIGNAL
-
Three phase group signal for current inputs
V3P
GROUP
SIGNAL
-
Three phase group signal for voltage inputs
BLOCK
BOOLEAN
0
Block of function
Table 79:
LEPDIS Output signals
Name
Type
Description
DLECND
INTEGER
Binary coded starts from load encroachment
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
LdAngle
5 - 85
Deg
1
38
Load encroachment inclination of load angular
sector
Section 7
1MRK 502 048-UUS A
Impedance protection
188
Technical manual
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