ABB RER620 Numerical Line Distance Protection Relay

ABB RER620 Numerical Line Distance Protection Relay – Advanced Transmission Network Protection

The ABB RER620 is a high-performance numerical distance protection relay engineered for comprehensive protection, control, and monitoring of overhead transmission lines and cable feeders in transmission and sub-transmission networks. Designed for mission-critical power infrastructure, the RER620 delivers multi-zone distance protection (ANSI 21), directional overcurrent protection (67), and advanced fault detection capabilities with sub-cycle response times to ensure grid stability and equipment safety.

Core Protection Functions & Technical Capabilities

The RER620 integrates a full suite of protection algorithms including distance protection zones (21), directional and non-directional overcurrent (50/51/67), sensitive earth fault detection (50N/51N/67N), power swing blocking (68), pole slip protection (78), and high-impedance fault detection. Its dual-processor architecture enables simultaneous execution of protection, measurement, and communication tasks without performance degradation, ensuring reliable operation even during complex fault scenarios.

Equipped with 16 binary inputs and 10 configurable output contacts, the relay supports flexible integration with existing substation control schemes. Dual Ethernet ports provide native IEC 61850 communication with MMS, GOOSE, and sampled values support, while serial interfaces enable legacy protocol compatibility including DNP3, Modbus, and IEC 60870-5-103.

Application Scenarios & System Integration

Ideal for utility substations, industrial power distribution, renewable energy interconnections, and railway electrification systems, the RER620 seamlessly integrates with ABB's Relion protection family and third-party SCADA platforms. Its disturbance recording and event logging capabilities capture high-resolution waveforms for post-fault analysis, supporting root cause investigation and system optimization.

The relay's adaptive protection settings allow automatic adjustment based on network topology changes, making it suitable for dynamic grid configurations including distributed generation integration and network reconfiguration scenarios. Wide-range power supply options (24-265 V DC/AC) ensure compatibility with diverse substation auxiliary systems.

Technical Specifications Summary

• Protection Zones: Up to 5 distance zones with independent reach and timing settings
• Measurement Accuracy: 0.5% for voltage/current, 1% for power measurements
• Operating Time: <20 ms for distance protection, <30 ms for overcurrent functions
• Communication: 2× Ethernet (IEC 61850, DNP3, Modbus TCP), 2× Serial (SPA, IEC 60870-5-103)
• Environmental Rating: -25°C to +55°C operating range, IP54 front panel protection
• Mounting: 4U 19" rack mount (177×177×144 mm) or panel installation
• Standards Compliance: IEC 60255, ANSI/IEEE C37.2, CE, UL, CSA certified

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