Negative-Sequence Overcurrent Protection (Nsptoc); Residual Overvoltage Protection (Rovptov) - ABB REV615 Product Manual

Capacitor Bank Protection and Control
REV615
Product version: 5.0 FP1
Table 35. 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 ,
n
Table 36. 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 37. Residual overvoltage protection (ROVPTOV)
Characteristic
Operation accuracy
1)2)
Start time
Reset time
Reset ratio
Retardation time
Operate time accuracy in definite time mode
Suppression of harmonics
1) Residual voltage before fault = 0.0 × U
measurements
2) Includes the delay of the signal output contact
ABB
Start value
I = 2 × set
Fault
Start value
I = 10 × set
Fault
= 50 Hz, results based on statistical distribution of 1000 measurements
n
Start value multiples in range of 1.5...20
Function
NSPTOC
NSPTOC
NSPTOC
NSPTOC
Start value
U = 2 × set
Fault
, f = 50 Hz, residual voltage with nominal frequency injected from random phase angle, results based on statistical distribution of 1000
n 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 voltage: f
±1.5% of the set value or ±0.002 × U
Minimum Typical
48 ms 51 ms
Typically 40 ms
Typically 0.96
<35 ms
±1.0% of the set value or ±20 ms
DFT: -50 dB at f = n × f , where n = 2, 3, 4, 5,...
n
1MRS757952 D
n
n
Maximum
28 ms
20 ms
3)
Step
0.01
0.01
10
±2 Hz
n
n
Maximum
54 ms
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