Table 62. Underfrequency protection (DAPTUF) main settings
Parameter
Function
Value (Range)
Step
Start value
DAPTUF
35.0...64.0 Hz
0.1
Operate delay time
DAPTUF
0.170...60.000 s
0.001
Table 63. Load shedding (LSHDPFRQ)
Characteristic
Value
Operation accuracy
At the frequency f = 35 to 66 Hz
± 0.003 Hz
Start time
1)2)
Load shed mode
Typical 175 ms (±15ms)
Typical 250 ms (±15ms)
Freq<: f
Fault
= 0.80 ×
set
Start value
freq< AND dfdt>: df/
dt = 0.3 Hz/s
Reset time
< 190 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 = 1.2 × f
n
, f
n
= 50 Hz
2) Includes the delay of the signal output contact
Table 64. Load shedding (LSHDPFRQ) main settings
Parameter
Function
Value (Range)
Step
Load shed mode
LSHDPFRQ
Freq<
freq< AND dfdt>
Freq< OR dfdt>
-
Restore mode
LSHDPFRQ
Disabled
Auto
Manual
-
Start Val frequency
LSHDPFRQ
35.00...60.00 Hz
0.01
Start value df/dt
LSHDPFRQ
0.10...10.00 Hz/s
0.01
Restore start Val
LSHDPFRQ
45.00...60.00 Hz
0.01
Frequency Op delay
LSHDPFRQ
0.170...60.000 s
0.001
Df/dt operate delay
LSHDPFRQ
0.170...60.000 s
0.001
Restore delay time
LSHDPFRQ
0.170...60.000 s
0.001
Feeder Protection and Control
1MRS756380 A
REF630
Product version: 1.0
Issued: 15.09.2009
ABB
45
Summary of Contents for REF630
Page 1: ...Relion 630 series Feeder Protection and Control REF630 Product Guide ...
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