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
Generator and Interconnection Protection
1MRS758279 B
REG615
Product version: 5.0 FP1
ABB
39
Содержание RELION REG615
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