Interconnection functions
Table 84. Directional reactive power undervoltage protection (DQPTUV )
Characteristic Value
Operation accuracy Depending on the frequency of the measured current and voltage:
f
n
±2 Hz
Reactive power range |PF| <0.71
Power:
±3.0% or ±0.002 × Q
n
Voltage:
±1.5% of the set value or ±0.002 × U
n
Start time
1)2)
Typically 46 ms
Reset time <50 ms
Reset ratio Typically 0.96
Operate time accuracy ±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)
Start value
= 0.05 × S
n
, reactive power before fault = 0.8 ×
Start value
, reactive power overshoot 2 times, results based on statistical distribution of 1000 measurements
2) Includes the delay of the signal output contact
Table 85. Directional reactive power undervoltage protection (DQPTUV) main settings
Parameter
Function Value (Range) Step
Voltage start value DQPTUV 0.20...1.20 × U
n
0.01
Operate delay time DQPTUV 100...300000 ms 10
Min reactive power DQPTUV 0.01...0.50 × S
n
0.01
Min Ps Seq current DQPTUV 0.02...0.20 × I
n
0.01
Pwr sector reduction DQPTUV 0...10° 1
Table 86. Low-voltage ride-through protection (LVRTPTUV)
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)
Typically 40 ms
Reset time Based on maximum value of
Recovery time
setting
Operate time accuracy ±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) Tested for
Number of Start phases
= 1 out of 3, results based on statistical distribution of 1000 measurements
2) Includes the delay of the signal output contact
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