ABB RET670 Product Guide

Table 122. Inverse time characteristics for residual overvoltage protection
Function Range or value Accuracy
Type A curve:
=
- >
>
æ ö
ç ÷
è ø
t
k
U U
U
EQUATION1436-SMALL V1 EN
U> = U
set
U = U
measured
k = (0.05-1.10) in steps of
0.01
±5.0% or ±45 ms whichever is greater
Type B curve:
2.0
480
32 0.5
=
⋅
− >
⋅ −
0.035+
>
 
 
 
t
k
U U
U
EQUATION1437-SMALL V2 EN
k = (0.05-1.10) in steps of
0.01
Type C curve:
 
3.0
480
32 0 .5
=
⋅
⋅ −
− >
0.03
5
+
>
 
 
t
k
U U
U
EQUATION1438-SMALL V2 EN
k = (0.05-1.10) in steps of
0.01
Programmable curve:
×
= +
- >
× -
>
æ ö
ç ÷
è ø
P
k A
t D
U U
B C
U
EQUATION1439-SMALL V1 EN
k = (0.05-1.10) in steps of
0.01
A = (0.005-200.000) in
steps of 0.001
B = (0.50-100.00) in steps
of 0.01
C = (0.0-1.0) in steps of 0.1
D = (0.000-60.000) in
steps of 0.001
P = (0.000-3.000) in steps
of 0.001
Transformer protection RET670 2.0
1MRK 504 141-BEN C
Product version: 2.0
ABB 103

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