Table 44. Positive-sequence undervoltage protection (PSPTUV) main settings
Parameter Function Value (Range) Step
Start value PSPTUV 0.010...1.200 × U
n
0.001
Operate delay time PSPTUV 40...120000 ms 10
Voltage block value PSPTUV 0.01...1.00 × U
n
0.01
Table 45. Negative-sequence overvoltage protection (NSPTOV)
Characteristic Value
Operation accuracy Depending on the frequency of the voltage measured: f
n
±1.5% of the set value or ±0.002 × U
n
Start time
1)2)
Minimum Typical Maximum
U
Fault
= 1.1 × set
Start value
U
Fault
= 2.0 × set
Start value
33 ms
24 ms
35 ms
26 ms
37 ms
28 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) Negative-sequence voltage before fault = 0.0 × U
n
, f
n
= 50 Hz, negative-sequence overvoltage 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 46. Negative-sequence overvoltage protection (NSPTOV) main settings
Parameter
Function Value (Range) Step
Start value NSPTOV 0.010...1.000 × U
n
0.001
Operate delay time NSPTOV 40...120000 ms 1
Table 47. Three-phase thermal overload protection, two time constants (T2PTTR)
Characteristic
Value
Operation accuracy Depending on the frequency of the measured current: f
n
±2 Hz
Current measurement: ±1.5% of the set value or ±0.002 x I
n
(at currents
in the range of 0.01...4.00 x I
n
)
Operate time accuracy
1)
±2.0% of the theoretical value or ±0.50 s
1) Overload current > 1.2 x Operate level temperature
Capacitor Bank Protection and Control
1MRS757952 D
Product version: 5.0 FP1
34 ABB
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