ABB RET615 - Page 44

Table 46. High-impedance based restricted earth-fault protection (HREFPDIF)
Characteristic Value
Operation accuracy Depending on the frequency of the current measured: f
n
±2 Hz
±1.5% 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
I
Fault
= 10.0 x set Operate
value
16 ms
11 ms
21 ms
13 ms
23 ms
14 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
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 47. High-impedance based restricted earth-fault protection (HREFPDIF) main settings
Parameter
Function Value (Range) Step
Operate value HREFPDIF 1.0...50.0 % 0.1
Minimum operate time HREFPDIF 40...300000 ms 1
Operation HREFPDIF Off
On
-
Table 48. Circuit breaker failure protection (CCBRBRF)
Characteristic
Value
Operation accuracy Depending on the frequency of the current measured: f
n
±2 Hz
±1.5% of the set value or ±0.002 x I
n
Operate time accuracy ±1.0% of the set value or ±20 ms
Transformer Protection and Control 1MRS756891 F
RET615
Product version: 4.0
44 ABB