ABB RET670 Product Manual page 61

ABB
Transformer protection RET670 ANSI
Pre-configured
Product version: 1.2
Table 39. Overfrequency protection SAPTOF (81)
Function
Operate value, pickup function
Operate time, pickup function
Reset time, pickup function
Operate time, definite time function
Reset time, definite time function
Table 40. Rate-of-change frequency protection SAPFRC (81)
Function
Operate value, pickup function
Operate value, internal blocking level
Operate time, pickup function
Range or value
(35.00-75.00) Hz
100 ms typically at f -0.5 Hz to f
set
100 ms typically
(0.000-60.000)s
(0.000-60.000)s
Range or value
(-10.00-10.00) Hz/s
(0-100)% of VBase
100 ms typically
1MRK 504 118-BUS A
Accuracy
± 2.0 mHz at
symmetrical three-
phase voltage
+0.5 Hz -
set
-
± 0.5% ± 10 ms
± 0.5% ± 10 ms
Accuracy
± 10.0 mHz/s
± 0.5% of V
n
-
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