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