Admittance-Based Earth-Fault Protection Efpadm - ABB RELION 620 Series Technical Manual

Protection functions
4.2.3.9 Technical data
Table 433: INTRPTEF Technical data
Characteristic
Operation accuracy (Uo criteria with transient protection)
Operate time accuracy
Suppression of harmonics
4.2.3.10 Technical revision history
Table 434: INTRPTEF Technical revision history
Technical revision
B
C
D
E
4.2.4

Admittance-based earth-fault protection EFPADM

4.2.4.1 Identification
Function description
Admittance-based earth-fault pro-
tection
428
Value
Depending on the frequency of the measured current: f
±1.5% of the set value or ±0.002 × Uo
±1.0% of the set value or ±20 ms
DFT: -50 dB at f = n × f , where n = 2, 3, 4, 5
n
Change
Minimum and default values changed to 40
Operate delay time setting
ms for the
Minimum operate current setting is add-
The
ed. Correction in IEC 61850 mapping: DO
BlkEF renamed to InhEF. Minimum value
changed from 0.01 to 0.10 (default changed
from 0.01 to 0.20) for the
setting. Minimum value changed from 0 ms
to 40 ms for the
Voltage start value description changed from
"Voltage start value for transient EF" to "Volt-
age start value" since the start value is effec-
tive in both operation modes. Added support
for calculated Uo. Uo source (measured/cal-
culated) can be selected with "Uo signal
Voltage start value setting minimum
Sel".
changed from 0.10 to 0.05.
Min operate current setting scaling corrected
to RMS level from peak level.
IEC 61850 IEC 60617
identification identification
EFPADM Yo> ->
1MRS757644 H
±2 Hz
n
Voltage start value
Reset delay time setting.
ANSI/IEEE C37.2
device number
21YN
620 series
Technical Manual