ABB REM610 Product Manual page 22

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