Negative-Sequence Overvoltage Protection (Nsptov); Negative-Sequence Overvoltage Protection (Nsptov) Main Settings; Frequency Protection (Frpfrq) - ABB REX640 Product Manual

REX640
Product version: 1
Table 88. Negative-sequence overvoltage protection (NSPTOV)
Characteristic
Operation accuracy
1)2)
Start time
Reset time
Reset ratio
Retardation time
Operate time accuracy in definite time mode
Suppression of harmonics
1) Negative-sequence voltage before fault = 0.0 × U
distribution of 1000 measurements
2) Includes the delay of the signal output contact
Table 89. Negative-sequence overvoltage protection (NSPTOV) main settings
Parameter
Start value
Operate delay time
Table 90. Frequency protection (FRPFRQ)
Characteristic
Operation accuracy
Start time
Reset time
Operate time accuracy
ABB
Start value
U = 1.1 × set
Fault
Start value
U = 2.0 × set
Fault
, f = 50 Hz, negative-sequence overvoltage with nominal frequency injected from random phase angle, results based on statistical
n n
Function
NSPTOV
NSPTOV
f>/f<
df/dt
f>/f<
df/dt
Value
Depending on the frequency of the voltage measured: f
±1.5% of the set value or ±0.002 × U
Minimum Typical
33 ms 35 ms
24 ms 26 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
Value (Range)
0.010...1.000 × U
n
40...120000 ms
Value
±5 mHz
±50 mHz/s (in range |df/dt| <5 Hz/s)
±2.0% of the set value (in range 5 Hz/s < |df/dt| < 15 Hz/s)
<80 ms
<120 ms
<150 ms
±1.0% of the set value or ±30 ms
1MRS759144 A
n
n
Maximum
37 ms
28 ms
Step
0.001
1
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