ABB REF630 User Manual

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

ABB REF630 Specifications

General

Brand	ABB
Model	REF630
Category	Protection Device
Language	English