ABB RELION 630 Series Product Manual page 36

Generator Protection and Control
REG630
Product version: 1.3
Table 55. High-impedance or flux-balance based differential protection for machines (MHZPDIF) main settings
Parameter
Operate value
Minimum operate time
Table 56. Stabilized differential protection for machines (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 × High operate value
Table 57. Stabilized differential protection for machines (MPDIF) main settings
Parameter
CT connection type
High operate value
Low operate value
Slope section 2
End section 1
End section 2
Table 58. Three-phase overvoltage protection (PHPTOV)
Characteristic
Operation accuracy
Start time 1)2)
Reset time
Reset ratio
Retardation time
Operate time accuracy in definite time mode
Operate time accuracy in inverse time mode
Suppression of harmonics
1) Start value = 1.0 × U , Voltage before fault = 0.9 × U
n
2) Includes the delay of the signal output contact
3) Maximum Start value = 1.20 × U
n
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Function
MHZPDIF
MHZPDIF
Biased low stage
Instantaneous high
3)
stage
Function
MPDIF
MPDIF
MPDIF
MPDIF
MPDIF
MPDIF
U = 2.0 × set Start value
Fault
, f = 50 Hz, overvoltage in one phase-to-phase with nominal frequency injected from random phase angle
n n
, Start value multiples in range of 1.10...2.00
Value (Range)
0.5...50.0%
0.02...300.00 s
Value
At the frequency f = f
n
±3% of the set value or ±0.002 × I
Typically 40 ms (±10 ms)
Typically 15 ms (±10 ms)
<40 ms
Typically 0.96
<20 ms
Value (Range)
1...2
100...1000%
5...30%
10.0...50.0%
0...100%
100...300%
Value
At the frequency f = f
n
±1.5% of the set value or ±0.002 × U
Typically 17 ms (±15 ms)
<40 ms
Depends of the set Relative hysteresis
<35 ms
±1.0% of the set value or ±20 ms
±5.0% of the theoretical value or ±20 ms
DFT: -50 dB at f = n × f , where n = 2, 3, 4, 5,...
n
1MRS757583 C
Step
0.1
0.01
n
Step
1
1
1
0.1
1
1
n
3)
ABB