ABB Relion 620 Series - Harmonics-Based Earth-Fault Protection HAEFPTOC

4.2.5.8 Monitored data
Table 449: MREFPTOC Monitored data
Name Type Values (Range) Unit Description
START_DUR FLOAT32 0.00...100.00 % Ratio of start time / op-
erate time
MREFPTOC Enum
1=on
2=blocked
3=test
4=test/blocked
5=off
Status
4.2.5.9 Technical data
Table 450: MREFPTOC Technical data
Characteristic Value
Operation accuracy Depending on the frequency of the current measured: f
n
±2 Hz
±1.5% of the set value or ±0.002 × I
n
Start time
1
,
2
I
Fault
= 1.2 × set Start
value
Minimum Typical Maximum
30 ms 34 ms 38 ms
Reset time <50 ms
Reset ratio Typically 0.96
Retardation time <50 ms
Operate time accuracy ±1.0% of the set value of ±20 ms
Suppression of harmonics -50 dB at f = n × f
n
, where n = 2, 3, 4, 5,…
4.2.6 Harmonics-based earth-fault protection HAEFPTOC
4.2.6.1 Identification
Description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Harmonics-based earth-fault pro-
tection
HAEFPTOC Io>HA 51NHA
4.2.6.2 Function block
OPERATE
START
Io
HAEFPTOC
I_REF_RES
BLOCK
Figure 234: Function block
1
Current before fault = 0.0 × I
n
, f
n
= 50 Hz, earth-fault current with nominal frequency injected
from random phase angle, results based on statistical distribution of 1000 measurements.
2
Includes the delay of the signal output contact.
Protection functions 1MRS757644 H
460 620 series
Technical Manual