Residual Overvoltage Protection (Rovptov); Negative Phase-Sequence Current Protection (Nsptoc) - ABB REF615 Product Manual

Feeder Protection and Control
REF615
Product version: 2.0
Table 42. Residual overvoltage protection (ROVPTOV)
Operation Depending on the frequency of the voltage measured: f
accuracy
±1.5% of the set value or ±0.002 x U
Start time 1) 2)
U
Fault
Reset time
Reset ratio
Retardation time
Operate time accuracy in definite time mode
Suppression of harmonics
1) Residual voltage before fault 0.0 x U
phase angle, results based on statistical distribution of 1000 measurements
2) Includes the delay of the signal output contact
Table 43. Residual overvoltage protection (ROVPTOV) main settings
Parameter
Start value
Operate delay time
Table 44. Negative phase-sequence current protection (NSPTOC)
Operation accuracy
Start time 1) 2)
I
I
Reset time
Reset ratio
Retardation time
Operate time accuracy in definite time mode
Operate time accuracy in inverse time mode
Suppression of harmonics
1) Negative sequence current before fault = 0.0, f
1000 measurements
2) Includes the delay of the signal output contact
3) Maximum Start value = 2.5 x I
32
= 1.1 x set Start value
, f = 50 Hz, residual voltage with nominal frequency injected from random
n n
Function
ROVPTOV
ROVPTOV
= 2 x set Start value
Fault
= 10 x set Start value
Fault
= 50 Hz, results based on statistical distribution of
n
, Start value multiples in range of 1.5 to 20
n
n
n
Minimum Typical
29 ms 31 ms
< 40 ms
Typical 0.96
< 35 ms
±1.0% of the set value or ±20 ms
DFT: -50dB at f = n x f ,
n
where n = 2, 3, 4, 5,...
Value (Range)
0.010...1.000 x U
n
40...300000 ms
Depending on the frequency of the
current measured: f = ±2Hz
n
±1.5% of the set value or ±0.002 x I
Minimum Typical
22 ms 24 ms
14 ms 16 ms
< 40 ms
Typical 0.96
< 35 ms
±1.0% of the set value or ±20 ms
±5.0% of the theoretical value or ±20
ms
3)
DFT: -50dB at f = n x f , where
n
n = 2, 3, 4, 5,...
1MRS756379 D
±2Hz
Maximum
32 ms
Step
0.001
1
n
Maximum
25 ms
17 ms
ABB