Table 51. Negative-sequence overvoltage protection (NSPTOV)
Characteristic
Value
Operation accuracy
Depending on the frequency of the voltage measured: f
n
±1.5% of the set value or ±0.002 × U
n
Start time
1)2)
Minimum
Typical
Maximum
U
Fault
= 1.1 × set
Start value
U
Fault
= 2.0 × set
Start value
33 ms
24 ms
35 ms
26 ms
37 ms
28 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)
Negative-sequence voltage before fault = 0.0 × U
n
, f
n
= 50 Hz, negative-sequence overvoltage 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
Table 52. Negative-sequence overvoltage protection (NSPTOV) main settings
Parameter
Function
Value (Range)
Step
Start value
NSPTOV
0.010...1.000 × U
n
0.001
Operate delay time
NSPTOV
40...120000 ms
1
Table 53. Frequency protection (FRPFRQ)
Characteristic
Value
Operation accuracy
f>/f<
±5 mHz
df/dt
±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)
Start time
f>/f<
<80 ms
df/dt
<120 ms
Reset time
<150 ms
Operate time accuracy
±1.0% of the set value or ±30 ms
Generator and Interconnection Protection
1MRS758279 B
REG615
Product version: 5.0 FP1
42
ABB
Содержание RELION REG615
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