Functionality - ABB Relion Technical Manual

Section 7
Impedance protection
7.5.2
7.5.3
7.5.4
7.5.5
Table 80: LEPDIS Group settings (basic)
Name Values (Range)
RLd 0.05 - 3000.00
LdAngle 5 - 85
188

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.
Function block
LEPDIS
I3P* DLECND
V3P*
BLOCK
ANSI10000119-1-en.vsd
ANSI10000119 V1 EN
Figure 84: LEPDIS function block
Signals
Table 78: LEPDIS Input signals
Name Type
I3P GROUP
SIGNAL
V3P GROUP
SIGNAL
BLOCK BOOLEAN
Table 79: LEPDIS Output signals
Name Type
DLECND INTEGER
Settings
Unit Step
ohm/p 0.01
Deg 1
Default Description
- Three phase group signal for current inputs
- Three phase group signal for voltage inputs
0 Block of function
Description
Binary coded starts from load encroachment
Default Description
1.00 Load resistive reach in ohm/phase
38 Load encroachment inclination of load angular
sector
1MRK 502 048-UUS A
Technical manual