ABB RET615 Product Manual page 44

Transformer Protection and Control
RET615
Product version: 4.0
Table 46. 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 47. High-impedance based restricted earth-fault protection (HREFPDIF) main settings
Parameter
Operate value
Minimum operate time
Operation
Table 48. Circuit breaker failure protection (CCBRBRF)
Characteristic
Operation accuracy
Operate time accuracy
44
Operate
I = 2.0 x set
Fault
value
I = 10.0 x set Operate
Fault
value
Function
HREFPDIF
HREFPDIF
HREFPDIF
Value
Depending on the frequency of the current measured: f
±2 Hz
±1.5% of the set value or ±0.002 x I
Minimum Typical
16 ms 21 ms
11 ms 13 ms
< 40 ms
Typical 0.96
< 35 ms
±1.0% of the set value or ±20 ms
Value (Range)
1.0...50.0 %
40...300000 ms
Off
On
Value
Depending on the frequency of the current measured: f
±2 Hz
±1.5% of the set value or ±0.002 x I
±1.0% of the set value or ±20 ms
1MRS756891 F
n
n
Maximum
23 ms
14 ms
Step
0.1
1
-
n
n
ABB