ABB RET670 Product Guide

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

ABB RET670 Specifications

General

Rated Frequency	50/60 Hz
Inputs	Analog and binary inputs
Application	Protection of power systems
Communication Protocols	IEC 61850, DNP3, Modbus
Operating Temperature Range	-25°C to +55°C
Mounting	Rack mounted
Number of Binary Inputs	Up to 48
Number of Binary Outputs	32
Protection Functions	Overcurrent Protection
Outputs	Binary outputs
Enclosure	IP 54
Type	Line Differential Protection
Number of Analog Inputs	24