ABB REM630 Product Manual page 39

ABB
Motor Protection and Control
REM630
Product version: 1.1
Table 54. Stabilized differential protection for motors (MPDIF)
Characteristic
Operation accuracy
1)2)
Operate time
Reset time
Reset ratio
Retardation time
1) Fn = 50 Hz, results based on statistical distribution of 1000 measurements
2) Includes the delay of the high speed power output contact
3) Ifault = 2 x High operate value
Table 55. Stabilized differential protection for motors (MPDIF) main settings
Parameter
CT connection type
High operate value
Low operate value
Slope section 2
End section 1
End section 2
Biased low stage
Instantaneous high stage
Function
MPDIF
MPDIF
MPDIF
MPDIF
MPDIF
MPDIF
Value
At the frequency f = fn
±3% of the set value or
±0.002 x In
Typical 40 ms (±10 ms)
Typical 15 ms (±10 ms)
3)
< 40 ms
Typical 0.96
< 20 ms
Values (Range)
1-2
100-1000
5-30
10.0-50.0
0-100
100-300
1MRS756977 D
Issued: 2011-05-18
Step
1
1
1
0.1
1
1
39