Directional Earth-Fault Protection Defxpdef; Identification; Function Block; Functionality - ABB RELION 611 Series Technical Manual

Section 4
Protection functions
4.2.2
4.2.2.1
4.2.2.2
4.2.2.3
172
Technical revision
E
F
G

Directional earth-fault protection DEFxPDEF

Identification

Function description
Directional earth-fault protection, low
stage
Directional earth-fault protection, high
stage

Function block

A070433 V2 EN
Figure 74: Function block

Functionality

The directional earth-fault protection function DEFxPDEF is used as directional
earth-fault protection for feeders.
The function starts and operates when the operating quantity (current) and polarizing
quantity (voltage) exceed the set limits and the angle between them is inside the set
operating sector. The operate time characteristic for low stage (DEFLPDEF) and high
stage (DEFHPDEF) can be selected to be either definite time (DT) or inverse definite
minimum time (IDMT).
In the DT mode, the function operates after a predefined operate time and resets when
the fault current disappears. The IDMT mode provides current-dependent timer
characteristics.
Change
Step value changed from 0.05 to 0.01 for the
multiplier setting
Internal improvement
Internal improvement
IEC 61850 IEC 60617
identification identification
DEFLPDEF Io> ->
DEFHPDEF Io>> ->
1MRS757454 D
Time
ANSI/IEEE C37.2
device number
67N-1
67N-2
611 series
Technical Manual