Table 35. Negative-sequence overcurrent protection (NSPTOC)
Characteristic
Value
Operation accuracy
Depending on the frequency of the measured current: f
n
±1.5% of the set value or ±0.002 × I
n
Start time
1)2)
Minimum
Typical
Maximum
I
Fault
= 2 × set
Start value
I
Fault
= 10 × set
Start value
23 ms
15 ms
26 ms
18 ms
28 ms
20 ms
Reset time
Typically 40 ms
Reset ratio
Typically 0.96
Retardation time
<35 ms
Operate time accuracy in definite time mode
±1.0% of the set value or ±20 ms
Operate time accuracy in inverse time mode
±5.0% of the theoretical value or ±20 ms
3)
Suppression of harmonics
DFT: -50 dB at f = n × f
n
, where n = 2, 3, 4, 5,…
1)
Negative sequence current before fault = 0.0, f
n
= 50 Hz, results based on statistical distribution of 1000 measurements
2)
Includes the delay of the signal output contact
3)
Maximum
Start value = 2.5 × I
n
,
Start value multiples in range of 1.5...20
Table 36. Negative-sequence overcurrent protection (NSPTOC) main settings
Parameter
Function
Value (Range)
Step
Start value
NSPTOC
0.01...5.00 × I
n
0.01
Time multiplier
NSPTOC
0.05...15.00
0.01
Operate delay time
NSPTOC
40...200000 ms
10
Operating curve type
1)
NSPTOC
Definite or inverse time
Curve type: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 17, 18, 19
1)
For further reference, see the Operation characteristics table
Table 37. Residual overvoltage protection (ROVPTOV)
Characteristic
Value
Operation accuracy
Depending on the frequency of the measured voltage: f
n
±2 Hz
±1.5% of the set value or ±0.002 × U
n
Start time
1)2)
Minimum
Typical
Maximum
U
Fault
= 2 × set
Start value
48 ms
51 ms
54 ms
Reset time
Typically 40 ms
Reset ratio
Typically 0.96
Retardation time
<35 ms
Operate time accuracy in definite time mode
±1.0% of the set value or ±20 ms
Suppression of harmonics
DFT: -50 dB at f = n × f
n
, where n = 2, 3, 4, 5,…
1)
Residual voltage before fault = 0.0 × U
n
, f
n
= 50 Hz, residual voltage with nominal frequency injected from random phase angle, results based on statistical distribution of 1000
measurements
2)
Includes the delay of the signal output contact
Capacitor Bank Protection and Control
1MRS757952 D
REV615
Product version: 5.0 FP1
ABB
31
Содержание RELION REV615
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