ABB Relion 620 Series - High-Impedance Based Restricted Earth-Fault Protection HREFPDIF

4.3.3.9 Technical data
Table 500: LREFPNDF Technical data
Characteristic Value
Operation accuracy Depending on the frequency of the measured current: f
n
±2
Hz
±2.5% of the set value or ±0.002 x I
n
Start time ,
Minimum Typical Maximum
I
Fault
= 2.0 × set Operate value
37 ms 41 ms 45 ms
Reset time Typically 40 ms
Reset ratio Typically 0.96
Retardation time <35 ms
Operate time accuracy in definite time mode ±1.0% of the set value or ±20 ms
Suppression of harmonics DFT: -50 dB at f = n × f
n
, where n = 2, 3, 4, 5, …
4.3.3.10 Technical revision history
Table 501: LREFPNDF Technical revision history
Technical revision Change
B Unit for setting Start value 2.H changed from
%In to %.
C Internal Improvement.
4.3.4 High-impedance based restricted earth-fault protection
HREFPDIF
4.3.4.1 Identification
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
High-impedance based restricted
earth-fault protection
HREFPDIF dIoHi> 87NH
4.3.4.2 Function block
Figure 295: Function block
1
Current before fault = 0.0, f
n
= 50 Hz, results based on statistical distribution of 1000 measure-
ments
2
Includes the delay of the signal output contact
1MRS757644 H Protection functions
620 series
Technical Manual
569