Table 70. Directional reactive power undervoltage protection (DQPTUV)
Characteristic Value
Operation accuracy At the frequency f = f
n
Power:
1.5% or 0.002 × Q
n
(±1.5%) for power, PF -0.71...0.71
Voltage:
±1.5% of the set value or ±0.002 × U
n
Start time
1)
Typically 22 ms
Reset time <40 ms
Reset ratio Typically 0.96
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 and so on
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 measurement.
Table 71. Directional reactive power undervoltage protection (DQPTUV) main settings
Parameter
Function Value (Range) Step
Voltage start value DQPTUV 0.20...1.20 pu 0.01
Operate delay time DQPTUV 0.1...300.00 s 0.01
Min reactive power DQPTUV 0.01...0.50 pu 0.01
Min PS current DQPTUV 0.02...0.20 pu 0.01
Pwr sector reduction DQPTUV 0.0...10.0° 1.0
Table 72. Reverse power/directional overpower protection (DOPPDPR)
Characteristic
Value
Operation accuracy At the frequency f = f
n
±3% of the set value or ±0.002 × S
n
Start time
1)2)
Typically 20 ms (±15 ms)
Reset time <40 ms
Reset ratio Typically 0.94
Retardation time <45 ms
Operate time accuracy ±1.0% of the set value of ±20 ms
1) U = U
n
, F
n
= 50 Hz, results based on statistical distribution of 1000 measurements.
2) Includes the delay of the signal output contact.
Table 73. Reverse power/directional overpower protection (DOPPDPR) main settings
Parameter
Function Value (Range) Step
Directional mode DOPPDPR Forward
Reverse
-
Start value DOPPDPR 0.01...2.00 pu 0.01
Power angle DOPPDPR -90.00...90.00° 0.01
Operate delay time DOPPDPR 0.04...300.00 s 0.01
Generator Protection and Control
1MRS757583 C
Product version: 1.3
40 ABB
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