ABB Relion 620 Series - Numerical Stabilized Low-Impedance Restricted Earth-Fault Protection LREFPNDF

Name Type Values (Range) Unit Description
IL3-diff FLOAT32 0.00...80.00 Measured differential
current amplitude
phase IL3
IL1-bias FLOAT32 0.00...80.00 Measured bias current
amplitude phase IL1
IL2-bias FLOAT32 0.00...80.00 Measured bias current
amplitude phase IL2
IL3-bias FLOAT32 0.00...80.00 Measured bias current
amplitude phase IL3
4.3.2.10 Technical data
Table 491: TR2PTDF Technical data
Characteristic Value
Operation accuracy Depending on the frequency of the measured current: f
n
±2 Hz
±3.0% of the set value or ±0.002 × I
n
Start time ,
Low stage
High stage
Minimum Typical Maximum
36 ms
21 ms
41 ms
22 ms
46 ms
24 ms
Reset time Typically 40 ms
Reset ratio Typically 0.96
Suppression of harmonics DFT: -50 dB at f = n × f
n
, where n = 2, 3, 4, 5, …
4.3.2.11 Technical revision history
Table 492: TR2PTDF Technical revision history
Technical revision Change
B 5th harmonic and waveform blockings taken
to event data set
C Added setting Slope section 3 . Added input
TAP_POS"
4.3.3 Numerical stabilized low-impedance restricted earth-fault
protection LREFPNDF
4.3.3.1 Identification
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Numerical stabilized low-impe-
dance restricted earth-fault protec-
tion
LREFPNDF dIoLo> 87NL
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 output contact. When differential current = 2 × set operate value and f
n
= 50 Hz.
Protection functions 1MRS757644 H
558 620 series
Technical Manual