Table 42. Negative-sequence overcurrent protection for machines (MNSPTOC) main settings
Parameter Function Value (Range) Step
Start value MNSPTOC
0.01...0.50 × I
n
0.01
Operating curve type MNSPTOC Definite or inverse time
Curve type: 5, 15, 17, 18
Operate delay time MNSPTOC 100...120000 ms 10
Operation MNSPTOC 1 = on
5 = off
-
Cooling time MNSPTOC 5...7200 s 1
Table 43. 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
Table 44. Residual overvoltage protection (ROVPTOV) main settings
Parameter
Function Value (Range) Step
Start value ROVPTOV 0.010...1.000 × U
n
0.001
Operate delay time ROVPTOV 40...300000 ms 1
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