ABB REG650 - Load Encroachment LEPDIS; Identification; Functionality; Function Block

7.5 Load encroachment LEPDIS
7.5.1 Identification
Function description
IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Load encroachment LEPDIS - -
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 enlarge the resistive setting of the underimpedance measuring
zones without interfering with the load.
Each of the three measuring phase-to-phase loops has its own load encroachment
characteristic.
7.5.3 Function block
LEPDIS
I3P*
U3P*
BLOCK
STCNDLE
IEC10000119-1-en.vsd
IEC10000119 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
U3P GROUP
SIGNAL
- Three phase group signal for voltage inputs
BLOCK BOOLEAN 0 Block of function
Table 79: LEPDIS Output signals
Name
Type Description
STCNDLE INTEGER Binary coded starts from load encroachment
1MRK 502 048-UEN A Section 7
Impedance protection
173
Technical manual