56
R E F61 5 A N S I 5.0 FP1
FEED ER P R OT EC T I O N A N D CO N T R O L
Interconnection functions
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Table 86. 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
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
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Table 87. 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 88. 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
