ABB REU615 Voltage Protection Relay

ABB REU615 Voltage Protection Relay – Advanced Medium Voltage Network Protection

The ABB REU615 is a sophisticated voltage protection relay engineered to safeguard medium voltage electrical networks against overvoltage, undervoltage, and frequency disturbances. Designed for substations, industrial facilities, and power distribution systems, this relay combines precision monitoring with rapid fault detection to ensure uninterrupted power quality and equipment longevity.

Technical Specifications

• Protection Functions: Overvoltage (59), Undervoltage (27), Frequency protection (81O/U), Voltage unbalance (47)
• Communication Protocols: IEC 61850, Modbus, DNP3.0
• Measurement Accuracy: ±0.5% for voltage, ±0.2% for frequency
• Operating Voltage Range: 80-300V AC/DC auxiliary supply
• Response Time: <30ms for critical fault detection
• Display: Graphical LCD with event logging and waveform capture
• Operating Temperature: -40°C to +70°C
• Compliance: IEC 60255, IEEE C37.90, CE certified

Application Scenarios

The REU615 excels in diverse industrial environments where voltage stability is mission-critical. In renewable energy installations, it protects grid-tied inverters from voltage fluctuations during cloud transients or wind variability. For manufacturing plants, the relay prevents costly downtime by isolating voltage sags before they damage sensitive CNC machinery or process controllers. In utility substations, it coordinates with transformer protection schemes to maintain power quality across distribution networks.

Integrated Solutions & System Architecture

When deployed within ABB's Relion® protection family, the REU615 seamlessly integrates with feeder, transformer, and motor protection relays through IEC 61850 GOOSE messaging. This enables coordinated protection strategies where voltage anomalies trigger cascading responses across multiple protection zones. The relay's built-in cybersecurity features (role-based access, encrypted communications) align with modern SCADA infrastructure requirements, while its compact DIN-rail mounting simplifies retrofits in space-constrained panels.

Why Choose ABB REU615?

• Adaptive Protection: Self-adjusting thresholds compensate for load variations
• Predictive Diagnostics: Trend analysis identifies degrading voltage conditions before failures occur
• Reduced Commissioning Time: Pre-configured templates and auto-configuration via PCM600 software
• Future-Proof Design: Firmware-upgradable for evolving grid codes and standards

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