ABB RET670 Product Guide

Table 26. Additional security logic for differential protection LDRGFC
Function Range or value Accuracy
Operate current, zero sequence current (1-100)% of lBase ±1.0% of I
r
Operate current, low current operation (1-100)% of lBase ±1.0% of I
r
Operate voltage, phase to neutral (1-100)% of UBase ±0.5% of U
r
Operate voltage, phase to phase (1-100)% of UBase ±0.5% of U
r
Independent time delay, zero sequence current at 0 to 2 x I
set
(0.000-60.000) s ±0.2% or ±40 ms
whichever is greater
Independent time delay, low current operation at 2 x I
set
to 0 (0.000-60.000) s ±0.2% or ± 40 ms
whichever is greater
Independent time delay, low voltage operation at 2 x U
set
to 0 (0.000-60.000) s ±0.2% or ±40 ms
whichever is greater
Reset time delay for startup signal at 0 to 2 x U
set
(0.000-60.000) s ±0.2% or ±40 ms
whichever is greater
Transformer protection RET670 2.0
1MRK 504 141-BEN C
Product version: 2.0
ABB 55

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