ABB RET670 Product Manual page 67

ABB
Transformer protection RET670
Pre-configured
Product version: 1.1
Frequency protection
Table 48. Underfrequency protection SAPTUF
Function
Operate value, start function
Operate time, start function
Reset time, start function
Operate time, definite time function
Reset time, definite time function
Voltage dependent time delay
Exponent
é - ù
U UMin
(
= ×
t tMax tMin
ê ú
ë - û
UNom UMin
EQUATION1182 V1 EN
U=U
measured
Table 49. Overfrequency protection SAPTOF
Function
Operate value, start function
Operate time, start function
Reset time, start function
Operate time, definite time function (0.000-60.000)s
Reset time, definite time function
Table 50. Rate-of-change frequency protection SAPFRC
Function
Operate value, start function
Operate value, internal blocking
level
Operate time, start function
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:
UNom=(50-150)% of
U
)
base
- +
tMin
UMin=(50-150)% of U
(Equation 3)
Exponent=0.0-5.0
tMax=(0.000-60.000)s
tMin=(0.000-60.000)s
Range or value
(35.00-75.00) Hz
100 ms typically
100 ms typically
(0.000-60.000)s
Range or value
(-10.00-10.00) Hz/s
(0-100)% of U
100 ms typically
1MRK 504 091-BEN B
Issued: June 2010
Accuracy
± 2.0 mHz
-
-
± 0.5% ± 10 ms
± 0.5% ± 10 ms
Class 5 + 200 ms
base
Accuracy
± 2.0 mHz at symmetrical
three-phase voltage
-
-
± 0.5% ± 10 ms
± 0.5% ± 10 ms
Accuracy
± 10.0 mHz/s
± 1.0% of U
base
-
r
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