ABB RET615 Product Manual page 34

Transformer Protection and Control
RET615
Product version: 2.0
Table 36. 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
2) Includes the delay of the signal output contact
Table 37. High-impedance based restricted earth-fault protection (HREFPDIF) main
settings
Parameter
Operate value
Minimum operate
time
Operation
Table 38. Circuit breaker failure protection (CCBRBRF)
Characteristic
Operation accuracy
Operate time accuracy
34
I = 2.0 x set
Fault
Operate value
I = 10.0 x set
Fault
Operate value
= 50 Hz, results based on statistical distribution of 1000 measurements
n
Function
HREFPDIF
HREFPDIF
HREFPDIF
Value
Depending on the frequency of the current
measured: f ±2Hz
n
±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 ±2Hz
n
±1.5% of the set value or ±0.002 x I
±1.0% of the set value or ±20 ms
1MRS756891 B
Issued: 01.10.2009
n
Maximum
23 ms
14 ms
Step
0.1
1
-
n
ABB