ABB Relion REM615 Product Manual page 40

Motor Protection and Control
REM615
Product version: 3.0
Table 39. 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
frequency injected from random phase angle, results based on statistical distribution of 1000 measurements
2) Includes the delay of the signal output contact
Table 40. Negative sequence overvoltage protection (NSPTOV) main settings
Parameter
Start value
Operate delay time
40
U = 1.1 × set
Fault
Start value
U = 2.0 × set
Fault
Start value
, f = 50 Hz, negative-sequence overvoltage with nominal
n n
Function
NSPTOV
NSPTOV
Value
Depending on the frequency of the voltage
measured: f ±2 Hz
n
±1.5% of the set value or ±0.002 × U
Minimum Typical
33 ms 35 ms
24 ms 26 ms
< 40 ms
Typical 0.96
< 35 ms
±1.0% of the set value or ±20 ms
DFT: -50 dB at f = n × f
n
...
Value (Range)
0.010...1.000 x U
n
40...120000 ms
1MRS756890 D
Issued: 2010-06-29
n
Maximum
37 ms
28 ms
, where n = 2, 3, 4, 5,
Step
0.001
1
ABB