ABB REF615E_1G Protection Relay

ABB REF615E_1G Protection Relay

 

 

The ABB REF615E_1G is a Relion® 615 series feeder protection and control relay (IED – Intelligent Electronic Device) used in medium and low-voltage power distribution systems to protect feeders, cables, and busbar sections.

Product Overview

• Brand: ABB
• Series: Relion 615 (REF615 family)
• Model: REF615E_1G
• Type: Feeder Protection & Control Relay (IED)
• Application: Power distribution protection, control, monitoring
• Communication: IEC 61850, Modbus, DNP3 (depending configuration)

What it actually is

This is not a PLC or standard control module.

It is a digital protection relay, meaning:

• It continuously monitors electrical parameters (current, voltage)
• Detects faults (overcurrent, earth fault, short circuit, etc.)
• Sends trip signals to circuit breakers in milliseconds

Core Functions

Typical protection functions include:

• Overcurrent protection (50/51)
• Earth fault protection (50N/51N)
• Voltage and frequency monitoring
• Thermal overload protection
• Circuit breaker control and status monitoring

System Role (Simple)

Power line / feeder
→ REF615E relay monitors electrical signals
→ detects abnormal condition
→ sends TRIP signal
→ circuit breaker disconnects faulted line

So it acts as the “electronic brain” of power protection systems.

Key Features

• Part of ABB Relion® 615 protection family
• Designed for feeder and distribution network protection
• Supports IEC 61850 digital substation communication
• Built-in measurement and monitoring functions
• Compact withdrawable design for panel mounting

Typical Applications

• Utility substations
• Industrial power distribution panels
• Cable and overhead feeder protection
• Transformer outgoing feeder protection
• Ring and radial distribution networks

Advantages

• Fast fault detection and tripping (high safety level)
• High reliability for power system protection
• Integrated control + monitoring + protection in one unit
• Supports modern substation communication standards
• Reduces need for multiple separate protection devices

Important Notes

• This is a protection relay (IED), not a PLC
• Configuration is done via PCM600 software
• Often used in utility-grade or industrial power systems
• Incorrect settings can cause nuisance tripping or system shutdown
• Many versions are configurable variants (REF615E / REF615R / etc.)

Precautions

• Must be configured by qualified protection engineers
• Always verify CT/VT ratios before commissioning
• Firmware and configuration must match system design
• Incorrect parameter settings can affect power stability
• High-voltage environment → safety-critical device