Product Overview

The REQ650 is a high-performance numerical voltage protection and control relay belonging to the ABB Relion 650 series. Specifically engineered for medium- and high-voltage power networks, the REQ650 functions as a primary Intelligent Electronic Device (IED) to ensure grid stability and asset safety. It provides comprehensive monitoring against overvoltage, undervoltage, and residual overvoltage conditions, making it a critical component for substation automation. With its modular architecture and native support for IEC 61850, the REQ650 facilitates seamless digital integration, offering precise measurement and rapid fault isolation to safeguard transformers, feeders, and sensitive industrial equipment.

Detailed Technical Specifications

• Manufacturer: ABB

• Model Designation: REQ650

• Product Series: Relion 650 Series

• Device Type: Voltage Protection and Control Relay

• Protection Logic: Overvoltage (3-phase), undervoltage (3-phase), residual overvoltage, and frequency-based protection

• Rated Current Input: 1 A or 5 A (Configurable)

• Rated Voltage Input: Standard secondary voltage up to 110 V AC

• Frequency Range: 50 / 60 Hz (Adaptive tracking)

• Auxiliary Power Supply: Universal wide-range 24–250 V DC or 48–240 V AC

• Binary I/O Configuration: Multiple programmable digital input and output channels for status feedback and trip logic

• Communication Protocols: IEC 61850 Edition 1 & 2, IEC 60870-5-103, Modbus RTU/TCP, DNP3

• Time Synchronization: Precision timing via SNTP and IRIG-B support

• Human Machine Interface (HMI): Local LCD display with navigational keypad and programmable LEDs

• Operating Temperature: -25°C to +70°C

• Storage Temperature: -40°C to +85°C

• Dimensions (WxHxD): 190 mm x 170 mm x 200 mm

• Weight: 3.0 kg

• Compliance Standards: IEC 60255 series for power system protection