ABB RED670 LINE DIFFERENTIAL

1. Product Overview

The RED670 adopts phase-segregated differential protection technology, based on Kirchhoff's Current Law, which realizes protection function by comparing the current flowing into and out of the protected area. This device supports the protection of up to 5 line terminals and can provide high-sensitivity detection for high-resistance faults.

2. Main Technical Parameters

Parameter Item	Specification Value
Rated Voltage	Up to 765 kV (Standard 400 kV)
Rated Current	Up to 5000 A (Maximum 6300 A)
Protection Accuracy	0.2%
Operating Temperature	-40°C to +70°C (Some models can reach +85°C)
Humidity	5% - 95% RH
Dimensions	230 mm × 160 mm × 100 mm (4U, 19-inch rack-mounted)
Weight	3.5 kg - 6 kg
Power Supply Mode	DC 24V-250V, AC 100V-250V
Protection Level	IP20
Depth	220 mm
Communication Interface	2× Fiber Optic Ethernet (100BASE-FX)Supports IEC 61850-8-1 (GOOSE), IEC 61850-9-2 (SV)Supports IEC 60870-5-103 (Optional)Data transmission supports dual-channel redundancy (dedicated optical fiber or multiplexed PCM)

3. Product Features

Core Protection Functions

• Phase-Segregated Current Differential Protection: Can handle 2-5 line terminals with phase selection capability
• Distance Protection: Four-zone distance protection, supporting phase selection and power swing detection
• Overcurrent Protection: Multifunctional overcurrent protection and thermal overload function
• Earth Fault Protection: High-impedance earth fault detection with high sensitivity
• Transformer Differential Protection: Can include two-winding or three-winding transformers

Technical Advantages

• High Sensitivity: Provides high-sensitivity protection for high-resistance faults
• Strong Anti-Interference Ability: Adopts advanced digital signal processing technology, ensuring stable operation in harsh electromagnetic environments
• Inrush Current Detection: Automatically detects transformer inrush current to ensure correct operation of differential protection
• Harmonic Suppression: 2nd and 5th harmonic suppression functions to improve protection reliability
• Pre-configuration: Factory pre-configuration, type test, and default parameter settings for quick commissioning
• Network Security: Equipped with network security features, complying with industrial security standards

4. Application Fields

Applicable Scenarios

• Overhead Lines: Transmission overhead lines of all voltage levels
• Underground Cables: High-voltage cable line protection
• Power Plants: Generator and transformer unit protection
• Substations: Substation feeder and main transformer protection
• Transformer Feeders: Supports two-winding and three-winding transformer configurations

Network Configuration

• Single-phase or three-phase tripping configuration
• Single-breaker or multi-breaker arrangement
• Single-ended, double-ended or multi-ended lines (up to 5 terminals)

5. Installation and Maintenance

Installation Requirements

• Installed in a standard 19-inch cabinet with a depth of 220mm
• Operating environment temperature: -40°C to +70°C
• Humidity: 5% - 95% RH (no condensation)
• Power supply: DC 24-250V or AC 100-250V
• Communication optical fiber: 100BASE-FX optical fiber interface

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