ABB RELION 620 Series Technical Manual page 564

Section 4
Protection functions
4.3.3.9
4.3.3.10
4.3.4
4.3.4.1
4.3.4.2
558
Technical data
Table 500: LREFPNDF Technical data
Characteristic
Operation accuracy
1)2)
Start time
I
Fault
Operate value
Reset time
Reset ratio
Retardation time
Operate time accuracy in definite time mode
Suppression of harmonics
1) Current before fault = 0.0, f
2) Includes the delay of the signal output contact
Technical revision history
Table 501: LREFPNDF Technical revision history
Technical revision
B
C
High-impedance based restricted earth-fault protection
HREFPDIF
Identification
Function description
High-impedance based restricted earth-
fault protection
Function block
GUID-0B400966-B2D9-4027-A2B3-786BA559A4A4 V3 EN
Figure 285: Function block
Value
Depending on the frequency of the measured
current: f
±2.5% of the set value or ±0.002 x I
Minimum
= 2.0 × set
37 ms
Typically 40 ms
Typically 0.96
<35 ms
±1.0% of the set value or ±20 ms
DFT: -50 dB at f = n × f
= 50 Hz, results based on statistical distribution of 1000 measurements
n
Change
Unit for setting
to %.
Internal Improvement.
IEC 61850
identification
HREFPDIF
1MRS757644 F
±2 Hz
n
n
Typical Maximum
41 ms 45 ms
, where n = 2, 3, 4, 5, ...
n
Start value 2.H changed from %In
IEC 60617 ANSI/IEEE C37.2
identification device number
dIoHi> 87NH
Technical Manual
620 series