Negative-Sequence Overcurrent Protection - ABB REG615 Product Manual

Generator and Interconnection Protection
REG615
Product version: 5.0 FP1
Table 39. Negative-sequence overcurrent protection (NSPTOC)
Characteristic
Operation accuracy
1)2)
Start time
Reset time
Reset ratio
Retardation time
Operate time accuracy in definite time mode
Operate time accuracy in inverse time mode
Suppression of harmonics
1) Negative sequence current before fault = 0.0, f
2) Includes the delay of the signal output contact
3) Maximum Start value = 2.5 × I , Start value multiples in range of 1.5...20
n
Table 40. Negative-sequence overcurrent protection (NSPTOC) main settings
Parameter
Start value
Time multiplier
Operate delay time
1)
Operating curve type
1) For further reference, see the Operation characteristics table
Table 41. Negative-sequence overcurrent protection for machines (MNSPTOC)
Characteristic
Operation accuracy
1)2)
Start time
Reset time
Reset ratio
Retardation time
Operate time accuracy in definite time mode
Operate time accuracy in inverse time mode
Suppression of harmonics
1) Negative-sequence current before = 0.0, f
2) Includes the delay of the signal output contact
3) Start value multiples in range of 1.10...5.00
38
Start value
I = 2 × set
Fault
Start value
I = 10 × set
Fault
= 50 Hz, results based on statistical distribution of 1000 measurements
n
Function
NSPTOC
NSPTOC
NSPTOC
NSPTOC
Start value
I = 2.0 × set
Fault
= 50 Hz, results based on statistical distribution of 1000 measurements
n
Value
Depending on the frequency of the measured current: f
±1.5% of the set value or ±0.002 × I
Minimum Typical
23 ms 26 ms
15 ms 18 ms
Typically 40 ms
Typically 0.96
<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
Value (Range)
0.01...5.00 × I
n
0.05...15.00
40...200000 ms
Definite or inverse time
Curve type: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 17, 18, 19
Value
Depending on the frequency of the measured current: f
±1.5% of the set value or ±0.002 x I
Minimum Typical
23 25 ms
Typically 40 ms
Typically 0.96
<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
1MRS758279 B
n
n
Maximum
28 ms
20 ms
3)
Step
0.01
0.01
10
n
n
Maximum
28 ms
3)
ABB