ABB RET670 - Page 75

Frequency protection
Table 63. Underfrequency protection SAPTUF
Function Range or value Accuracy
Operate value, start function, at symmetrical three
phase voltage
(35.00-75.00) Hz ± 2.0 mHz
Operate time, start at f
set
+ 0.02 Hz to f
set
- 0.02 Hz
fn = 50 Hz
Min. = 80 ms
-
Max. = 95 ms
fn = 60 Hz
Min. = 65 ms
Max. = 80 ms
Reset time, start at f
set
- 0.02 Hz to f
set
+ 0.02 Hz Min. = 15 ms
Max. = 30 ms
-
Operate time, definite time function at f
set
+ 0.02 Hz to
f
set
- 0.02 Hz
(0.000-60.000)s ± 0.2% or ± 100 ms whichever is greater
Reset time, definite time function at f
set
- 0.02 Hz to f
set
+ 0.02 Hz
(0.000-60.000)s ± 0.2% or ± 120 ms whichever is greater
Voltage dependent time delay Settings:
UNom=(50-150)% of U
base
UMin=(50-150)% of U
base
Exponent=0.0-5.0
tMax=(0.010–60.000)s
tMin=(0.010–60.000)s
± 1.0% or ± 120 ms whichever is greater
( )
Exponent
U UMin
t tMax tMin tMin
UNom UMin
-
= × - +
-
é ù
ê ú
ë û
EQUATION1182 V1 EN (Equation 4)
U=U
measured
Table 64. Overfrequency protection SAPTOF
Function
Range or value Accuracy
Operate value, start function at symmetrical three-phase voltage (35.00-90.00) Hz ± 2.0 mHz
Operate time, start at f
set
- 0.02 Hz to f
set
+ 0.02 Hz
fn = 50Hz
Min. = 80 ms
Max. = 95 ms
-
fn = 60 Hz
Min. = 65 ms
Max. = 80 ms
Reset time, start at f
set
+ 0.02 Hz to f
set
- 0.02 Hz Min. = 15 ms
Max. = 30 ms
-
Operate time, definite time function at f
set
-0.02 Hz to f
set
+ 0.02 Hz (0.000-60.000)s ± 0.2% ± 100 ms
whichever is greater
Reset time, definite time function at f
set
+ 0.02 Hz to f
set
- 0.02 Hz (0.000-60.000)s ± 0.2% ± 120 ms,
whichever is greater
Transformer protection RET670 2.0
1MRK 504 141-BEN C
Product version: 2.0
ABB 75