High-Impedance Based Restricted Earth-Fault Protection (Hrefpdif) - ABB REX640 Product Manual

REX640
Product version: 1
Table 158. Numerical stabilized low-impedance restricted earth-fault protection (LREFPNDF) main settings
Parameter
Operate value
Minimum operate time
Restraint mode
Start value 2.H
Operation
Table 159. High-impedance based restricted earth-fault protection (HREFPDIF)
Characteristic
Operation accuracy
1)2)
Start time
Reset time
Reset ratio
Retardation time
Operate time accuracy in definite time mode
1) Current before fault = 0.0, f = 50 Hz, results based on statistical distribution of 1000 measurements
n
2) Includes the delay of the signal output contact
Table 160. High-impedance based restricted earth-fault protection (HREFPDIF) main settings
Parameter
Operate value
Minimum operate time
Operation
ABB
Function
LREFPNDF
LREFPNDF
LREFPNDF
LREFPNDF
LREFPNDF
I = 2.0 × set Operate value
Fault
Operate value
I = 10.0 × set
Fault
Function
HREFPDIF
HREFPDIF
HREFPDIF
Value (Range)
5.0...50.0 %I
n
40...300000 ms
1 = None
2 = Harmonic2
10...50%
1 = on
5 = off
Value
Depending on the frequency of the measured current: f
±1.5% of the set value or ±0.002 × I
Minimum Typical
16 ms 21 ms
11 ms 13 ms
Typically 40 ms
Typically 0.96
<35 ms
±1.0% of the set value or ±20 ms
Value (Range)
1.0...50.0 %I
n
40...300000 ms
1 = on
5 = off
1MRS759144 A
Step
1
1
-
1
-
±2 Hz
n
n
Maximum
23 ms
14 ms
Step
0.1
1
-
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