Table 74. Underpower protection (DUPPDPR)
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 75. Underpower protection (DUPPDPR) main settings
Parameter
Function Value (Range) Step
Start value DUPPDPR 0.01...2.00 pu 0.01
Operate delay time DUPPDPR 0.04...300.00 s 0.01
Disable time DUPPDPR 0.00...60.00 s 0.01
Pol reversal DUPPDPR No
Yes
-
Table 76. Frequency gradient protection (DAPFRC)
Characteristic
Value
Operation accuracy df/dt < ±10 Hz/s: ±10 mHz/s
Undervoltage blocking: ±1.5% of the set value or ±0.002 × U
n
Start time
1)2)
Start value
= 0.05 Hz/s
df/dt
FAULT
= ±1.0 Hz/s
Typically 110 ms (±15 ms)
Reset time <150 ms
Operate time accuracy in definite time mode ±1.0% of the set value or ±30 ms
Suppression of harmonics DFT: -50 dB at f = n × f
n
, where n = 2, 3, 4, 5,…
1) Frequency before fault = 1.0 × f
n
, f
n
= 50 Hz
2) Includes the delay of the signal output contact
Table 77. Frequency gradient protection (DAPFRC) main settings
Parameter
Function Value (Range) Step
Start value DAPFRC -10.00...10.00 Hz/s 0.01
Operate delay time DAPFRC 0.120...60.000 s 0.001
Generator Protection and Control
1MRS757583 C
Product version: 1.3
ABB 41
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