Stabilized And Instantaneous Differential Protection For Machines; Third Harmonic-Based Stator Earth-Fault Protection - ABB REG615 Product Manual

Generator and Interconnection Protection
REG615
Product version: 5.0 FP1
Table 69. Stabilized and instantaneous differential protection for machines (MPDIF)
Characteristic
Operation accuracy
1)2)
Operate time
Reset time
Reset ratio
Retardation time
1) F = 50 Hz, results based on statistical distribution of 1000 measurements
n
2) Includes the delay of the power output contact
Table 70. Stabilized and instantaneous differential protection for machines (MPDIF) main settings
Parameter
Low operate value
High operate value
Slope section 2
End section 1
End section 2
DC restrain enable
CT connection type
CT ratio Cor Line
CT ratio Cor Neut
Table 71. Third harmonic-based stator earth-fault protection (H3EFPSEF)
Characteristic
Operation accuracy
1)2)
Start time
Reset time
Reset ratio
Operate time accuracy
1) f = 50 Hz, results based on statistical distribution of 1000 measurements
n
2) Includes the delay of the signal output contact
ABB
Low stage
High stage
Function
MPDIF
MPDIF
MPDIF
MPDIF
MPDIF
MPDIF
MPDIF
MPDIF
MPDIF
Value
Depending on the frequency of the current measured: f
±3% of the set value or ±0.002 x I
Minimum Typical
36 ms 40 ms
18 ms 22 ms
<40 ms
Typically 0.95
<20 ms
Value (Range)
5...30 %Ir
100...1000 %Ir
10...50%
0...100 %Ir
100...300 %Ir
0 = False
1 = True
1 = Type 1
2 = Type 2
0.40...4.00
0.40...4.00
Value
Depending on the frequency of the measured voltage:
f ±2 Hz
n
±5% of the set value or ±0.004 × U
Typically 35 ms
Typically 35 ms
Typically 0.96 (differential mode)
Typically 1.04 (under voltage mode)
±1.0% of the set value of ±20 ms
1MRS758279 B
±2 Hz
n
n
Maximum
42 ms
27 ms
Step
1
10
1
1
1
-
-
0.01
0.01
n
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