ABB Relion 630 Series RET630 Product Manual page 49

ABB
Transformer Protection and Control
RET630
Product version: 1.1
Table 63. Frequency gradient protection (DAPFRC) main settings
Parameter
Start value
Operate delay time
Table 64. Overfrequency protection (DAPTOF)
Characteristic
Operation accuracy
1)2)
Start time
Reset time
Operate time accuracy in definite time mode
Suppression of harmonics
1) Frequency before fault = 0.99 × f
2) Includes the delay of the signal output contact
Table 65. Overfrequency protection (DAPTOF) main settings
Parameter
Start value
Operate delay time
Table 66. Underfrequency protection (DAPTUF)
Characteristic
Operation accuracy
1)2)
Start time
Reset time
Operate time accuracy in definite time mode
Suppression of harmonics
1) Frequency before fault = 1.01 × f
2) Includes the delay of the signal output contact
Function
DAPFRC
DAPFRC
f = 1.01 × set
Fault
Start value
, f = 50 Hz
n n
Function
DAPTOF
DAPTOF
f = 0.99 × set
Fault
Start value
, f = 50 Hz
n n
Value (Range)
-10.00...10.00 Hz/s
0.120...60.000 s
Value
At the frequency f = 35 to 66 Hz
± 0.003 Hz
Typical < 190 ms
< 190 ms
±1.0% of the set value or ±30 ms
DFT: -50 dB at f = n × f
n
...
Value (Range)
35.0...64.0 Hz
0.170...60.000 s
Value
At the frequency f = 35 to 66 Hz
± 0.003 Hz
Typical < 190 ms
< 190 ms
±1.0% of the set value or ±30 ms
DFT: -50 dB at f = n × f
n
...
1MRS756978 D
Issued: 2011-05-18
Step
0.01
0.001
, where n = 2, 3, 4, 5,
Step
0.1
0.001
, where n = 2, 3, 4, 5,
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