ABB RET670 Product Manual page 60

Transformer protection RET670 ANSI
Pre-configured
Product version: 1.2
Frequency protection
Table 38. Underfrequency protection SAPTUF (81)
Function
Operate value, pickup function
Operate time, pickup function
Reset time, pickup function
Operate time, definite time function
Reset time, definite time function
Voltage dependent time delay
EQUATION1559 V1 EN
V=V
measured
60
Range or value
(35.00-75.00) Hz
100 ms typically
100 ms typically
(0.000-60.000)s
(0.000-60.000)s
Settings:
VNom=(50-150)% of V
VMin=(50-150)% of V
Exponent=0.0-5.0
t_MaxTripDelay=(0.000-60.000)
s
t_MinTripDelay=(0.000-60.000)
s
(Equation 3)
1MRK 504 118-BUS A
Accuracy
± 2.0 mHz
-
-
± 0.5% ± 10 ms
± 0.5% ± 10 ms
Class 5 + 200 ms
base
base
ABB