ABB Relion 615 series - Page 43

Table 46. Stabilized restricted earth-fault protection (LREFPNDF) main settings
Parameter Function Value (Range) Step
Operate value LREFPNDF 5...50 %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 47. High-impedance based restricted earth-fault protection (HREFPDIF)
Characteristic
Value
Operation accuracy At the frequency f = f
n
±1.5% of the set value or ±0.002 × I
n
Start time
1)2)
I
Fault
= 2.0 × set Operate value
I
Fault
= 10.0 × set Operate value
Typically 22 ms (±5 ms)
Typically 15 ms (±5 ms)
Reset time <60 ms
Reset ratio Typically 0.96
Retardation time <60 ms
Operate time accuracy in definite time mode ±1.0% of the set value or ±20 ms
1) Current before fault = 0.0 × I
n
, f
n
= 50 Hz
2) Includes the delay of the signal output contact
Table 48. 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
-
Table 49. Circuit breaker failure protection (CCBRBRF)
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
Operate time accuracy ±1.0% of the set value or ±20 ms
Reset time Typically 40 ms
Retardation time <20 ms
Transformer Protection and Control
1MRS756891 M
RET615
Product version: 5.0 FP1
ABB 43