ABB REF615E_G Feeder Protection Relay High Quality

Overview

The ABB REF615E_G is a high-performance, microprocessor-based feeder protection and control relay. It belongs to the Relion® 615 series. It supports medium-voltage networks from 11 kV to 33 kV. The suffix “G” indicates a standard hardware configuration. It provides cost-effective solutions while ensuring robust protection and communication.

Technical Specifications

Protection Functions

• Phase Overcurrent 50/51: Instantaneous and time-delayed protection.
• Ground Fault 50N/51N: Detects earth faults reliably.
• Directional Overcurrent 67/67N: Uses voltage-polarized directional sensing.
• Auto-Reclosing 79: Offers 1–4 shots, single or three-phase.
• Undervoltage/Overvoltage 27/59: Monitors abnormal voltage including residual voltage.
• Breaker Failure 50BF: Performs backup tripping with programmable delay.

Electrical Ratings

• Current Inputs: 4 × CT inputs, selectable 1 A or 5 A.
• Voltage Inputs: 3 × VT inputs, nominal 110 V / 120 V.
• Accuracy: ±0.5% for analog measurements.
• Overcurrent Range: Phase 0.05–40.00 A; Ground 0.01–10.00 A.
• Operating Time: <35 ms for instantaneous overcurrent.

Inputs & Outputs

• Digital Inputs: 16 configurable channels.
• Digital Outputs: 10 configurable plus 2 alarm relays.
• Relay Contacts: Rated 250 V AC / 5 A or 30 V DC / 5 A.

Communication & Interfaces

• Protocols Supported: IEC 61850 Edition 2 (GOOSE, MMS, Sampled Values), Modbus RTU, IEC 60870-5-103.
• Ports: 2 × Ethernet, 1 × RS485.
• Time Synchronization: SNTP and IRIG-B.

Mechanical & Environmental

• Display: 128×64 graphical LCD, 6 programmable LEDs, and keypad.
• Mounting: DIN rail or panel mount.
• Dimensions: 177 × 177 × 125 mm.
• Operating Temperature: –40°C to +70°C.
• Protection Class: IP54 front, IP20 rear.
• Event Storage: Up to 100 COMTRADE fault records (8 GB).