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M14976-1 v10
Table 71. Rate-of-change of frequency protection SAPFRC
Function
Range or value
Accuracy
Operate value, start function
(-10.00-10.00) Hz/s
±10.0 mHz/s
Operate value, restore enable frequency
(45.00-65.00) Hz
±2.0 mHz
Definite restore time delay
(0.000-60.000) s
±0.2% or ±100 ms whichever is
greater
Definite time delay for frequency gradient trip
(0.000-60.000) s
±0.2% or ±120 ms whichever is
greater
Definite reset time delay
(0.000-60.000) s
±0.2% or ±250 ms whichever is
greater
1MRK 504 155-BEN F
Transformer protection RET670 2.1 IEC
ABB
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