Table 24. Instantaneous or definite-time earth-fault protection (I
0
>)
Feature
Value
Set start value, I
0
>
• At definite-time characteristic
1.0...100% I
n
Start time, typical
50 ms
Time/current characteristic
• Definite time operate time, t
0
>
0.05...300 s
Resetting time, typical/maximum
40/50 ms
Retardation time
30 ms
Drop-off/pick-up ratio, typical
0.96
Operate time accuracy at definite-time
characteristic
±2% of the set operate time or ±25 ms
Operation accuracy
• 1.0...10.0% I
n
±5% of the set start value
• 1.0...100% I
n
±3% of the set start value
Table 25. Inverse-time unbalance protection based on the negative phase sequence
current (I
2
>)
Feature
Value
Set start value, I
2
>
• At IDMT characteristic
0.10...0.50 x I
n
Start time, typical
100 ms
Time/current characteristic
• IDMT time constant, K
2
5...100
Resetting time, typical/maximum
130/200 ms
Drop-off/pick-up ratio, typical
0.95
Operate time accuracy
• I
2
> + 0.065...4.0 x I
n
±5% of the calculated operate time or ±100 ms
Operation accuracy
±5% of the set start value
Inhibitation of I
2
>
I < 0.12 x I
n
or I > 4.0 x I
n
Motor Protection
1MRS756304 C
REM610
Product version: C
Issued: 30.10.2009
22
ABB
Summary of Contents for REM 610
Page 1: ...Relion 610 series Motor Protection REM610 Product Guide...
Page 34: ...34...
Page 35: ......
