ABB REG630 - Page 39

Table 66. Negative-sequence overvoltage protection (NSPTOV)
Characteristic Value
Operation accuracy At the frequency f = f
n
±1.5% of the set value or ±0.002 × U
n
Start time
1)2)
U
Fault
= 1.1 × set Start value
U
Fault
= 2.0 × set Start value
Typically 29 ms (± 15ms)
Typically 24 ms (± 15ms)
Reset time <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 of nominal frequency injected from random phase angle
2) Includes the delay of the signal output contact
Table 67. Negative-sequence overvoltage protection (NSPTOV) main settings
Parameter
Function Value (Range) Step
Start value NSPTOV 0.010...1.000 pu 0.001
Operate delay time NSPTOV 0.040...120.000 s 0.001
Table 68. Residual overvoltage protection (ROVPTOV)
Characteristic
Value
Operation accuracy At the frequency f = f
n
±1.5% of the set value or ±0.002 × U
n
Start time
1)2)
U
Fault
= 1.1 × set Start value Typically 27 ms (± 15 ms)
Reset time <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
2) Includes the delay of the signal output contact
Table 69. Residual overvoltage protection (ROVPTOV) main settings
Parameter
Function Value (Range) Step
Start value ROVPTOV 0.010...1.000 pu 0.001
Operate delay time ROVPTOV 0.040...300.000 s 0.001
Generator Protection and Control
1MRS757583 C
REG630
Product version: 1.3
ABB 39