ABB REX640 - High-Impedance Based Restricted Earth-Fault Protection (HREFPDIF)

Table 158. Numerical stabilized low-impedance restricted earth-fault protection (LREFPNDF) main settings
Parameter Function Value (Range) Step
Operate value LREFPNDF 5.0...50.0 %I
n
1
Minimum operate time LREFPNDF 40...300000 ms 1
Restraint mode LREFPNDF 1 = None
2 = Harmonic2
-
Start value 2.H LREFPNDF 10...50% 1
Operation LREFPNDF 1 = on
5 = off
-
Table 159. High-impedance based restricted earth-fault protection (HREFPDIF)
Characteristic
Value
Operation accuracy Depending on the frequency of the measured current: f
n
±2 Hz
±1.5% of the set value or ±0.002 × I
n
Start time
1)2)
Minimum Typical Maximum
I
Fault
= 2.0 × set Operate value
I
Fault
= 10.0 × set Operate value
16 ms
11 ms
21 ms
13 ms
23 ms
14 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
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
Table 160. High-impedance based restricted earth-fault protection (HREFPDIF) main settings
Parameter
Function Value (Range) Step
Operate value HREFPDIF 1.0...50.0 %I
n
0.1
Minimum operate time HREFPDIF 40...300000 ms 1
Operation HREFPDIF 1 = on
5 = off
-
1MRS759144 A
REX640
Product version: 1
ABB 79