ABB RET670 Product Guide

Scheme communication
Table 73. Scheme communication logic for residual overcurrent protection ECPSCH
Function Range or value Accuracy
Scheme type Permissive Underreaching
Permissive Overreaching
Blocking
-
Communication scheme
coordination time
(0.000-60.000) s ±0.2% or ±20 ms whichever is greater
Table 74. Current reversal and weak-end infeed logic for residual overcurrent protection ECRWPSCH
Function
Range or value Accuracy
Operate mode of WEI logic Off
Echo
Echo & Trip
-
Operate voltage 3U0 for WEI trip (5-70)% of UBase ± 0.5% of U
r
Operate time for current reversal
logic
(0.000-60.000) s ± 0.2% or ±30 ms whichever is greater
Delay time for current reversal (0.000-60.000) s ± 0.2% or ±30 ms whichever is greater
Coordination time for weak-end
infeed logic
(0.000–60.000) s ± 0.2% or ±30 ms whichever is greater
Transformer protection RET670 2.0
1MRK 504 141-BEN C
Product version: 2.0
ABB 85

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