4.3.3.8 Monitored data
Table 350: LREFPNDF Monitored data
Name Type Values (Range) Unit Description
START_DUR FLOAT32 0.00...100.00 % Ratio of start time /
operate time
RES2H BOOLEAN 0=False
1=True
2nd harmonic restraint
ID_COSPHI FLOAT32 0.00...80.00 xIn Directional differential
current Id cosphi
IB FLOAT32 0.00...80.00 xIn Bias current
LREFPNDF Enum 1=on
2=blocked
3=test
4=test/blocked
5=off
Status
4.3.3.9 Technical data
Table 351: LREFPNDF Technical data
Characteristic Value
Operation accuracy Depending on the frequency of the current
measured: f
n
±2 Hz
±2.5% of the set value or ±0.002 x I
n
Start time
1)2)
Minimum Typical Maximum
I
Fault
= 2.0 x set
Operate value
38 ms 40 ms 43 ms
Reset time < 40 ms
Reset ratio Typical 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 x f
n
, where n = 2, 3, 4, 5, …
1) Current before fault = 0.0, f
n
= 50 Hz, results based on statistical distribution of 1000 measurements
2) Includes the delay of the signal output contact
4.3.4 High-impedance-based restricted earth-fault protection
HREFPDIF
4.3.4.1 Identification
Functional description
IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
High-impedance-based restricted earth-
fault protection
HREFPDIF dIoHi> 87NH
1YHT530004D05 D Section 4
Protection functions
615 series 431
Technical Manual
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