ABB
31
Feeder Protection and Control
REF615
Product version: 2.0
1MRS756379 D
Table 39. Positive sequence undervoltage protection (PSPTUV) main settings
Parameter
Function
Value (Range)
Step
Start value
PSPTUV
0.010...1.200 x U
n
0.001
Operate delay time
PSPTUV
40...120000 ms
10
Voltage block value
PSPTUV
0.01...1.0 x U
n
0.01
Table 40. Negative sequence overvoltage protection (NSPTOV)
Operation
accuracy
Depending on the frequency of the voltage measured: f
n
±2Hz
±1.5% of the set value or ±0.002 x U
n
Start time
1) 2)
Minimum
Typical
Maximum
U
Fault
= 1.1 x set
Start value
33 ms
35 ms
37 ms
U
Fault
= 2.0 x set
Start value
24 ms
26 ms
28 ms
Reset time
< 40 ms
Reset ratio
Typical 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: -50dB at f = n x f
n
,
where n = 2, 3, 4, 5,…
1) Negative sequence voltage before fault 0.0 x U
n
, f
n
= 50 Hz, negative sequence overvoltage with nominal
frequence injected from random phase angle, results based on statistical distribution of 1000 measurements
2) Includes the delay of the signal output contact
Table 41. Negative sequence overvoltage protection (NSPTOV) main settings
Parameter
Function
Value (Range)
Step
Start value
NSPTOV
0.010...1.000 x U
n
0.001
Operate delay time
NSPTOV
40...120000 ms
1
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