ABB Relion 630 Series RET630 Product Manual page 38

Transformer Protection and Control
RET630
Product version: 1.1
Table 40. 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 × I
2) Includes the delay of the signal output contact
Table 41. High-impedance based restricted earth-fault protection (HREFPDIF) main
settings
Parameter
Operate value
Minimum operate
time
38
I = 2.0 × set
Fault
Operate value
I = 10.0 × set
Fault
Operate value
, f = 50 Hz
n n
Function
HREFPDIF
HREFPDIF
Value
At the frequency f = f
n
±1.5% of the set value or ±0.002 × I
Typical 22 ms (±5 ms)
Typical 15 ms (±5 ms)
< 60 ms
Typical 0.96
< 60 ms
±1.0% of the set value or ±20 ms
Value (Range)
0.5...50.0 %
0.020...300.000 s
1MRS756978 D
Issued: 2011-05-18
n
Step
0.1
0.001
ABB