Harmonics-Based Earth-Fault Protection Haefptoc - ABB RELION 620 Series Technical Manual

Protection functions
4.2.5.8 Monitored data
Table 449: MREFPTOC Monitored data
Name Type
START_DUR FLOAT32
MREFPTOC Enum
4.2.5.9 Technical data
Table 450: MREFPTOC Technical data
Characteristic
Operation accuracy
1 2
Start time , I
value
Reset time
Reset ratio
Retardation time
Operate time accuracy
Suppression of harmonics
4.2.6

Harmonics-based earth-fault protection HAEFPTOC

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