Table 58. 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
Table 59. Overfrequency protection (DAPTOF)
Characteristic
Value
Operation accuracy
At the frequency f = 35 to 66 Hz
± 0.003 Hz
Start time
1)2)
f
Fault
= 1.01 × set
Start value
Typical < 190 ms
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 = 0.99 × f
n
, f
n
= 50 Hz
2) Includes the delay of the signal output contact
Table 60. Overfrequency protection (DAPTOF) main settings
Parameter
Function
Value (Range)
Step
Start value
DAPTOF
35.0...64.0 Hz
0.1
Operate delay time
DAPTOF
0.170...60.000 s
0.001
Table 61. Underfrequency protection (DAPTUF)
Characteristic
Value
Operation accuracy
At the frequency f = 35 to 66 Hz
± 0.003 Hz
Start time
1)2)
f
Fault
= 0.99 × set
Start value
Typical < 190 ms
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 = 1.01 × f
n
, f
n
= 50 Hz
2) Includes the delay of the signal output contact
Transformer Protection and Control
1MRS756788 A
RET630
Product version: 1.0
Issued: 15.09.2009
42
ABB
Содержание RET630
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