ABB REM615E_L medium-voltage protection relays

The following is an analysis of the core technologies of the ABB REM615E_L medium-voltage protection relay:

Core Positioning

Model: REM615E_L

Series: ABB Relion® 615 Economy Line Protection Relay

Suffix Meaning:

E: Standard hardware platform

L: Cost-optimized or specific installation configuration

Key Features and Differences (VS REM615E_G)

Features REM615E_G REM615E_L

Core Protection: Distance protection + overcurrent/ground fault/ARC Basic overcurrent/ground fault protection (no distance protection)

Communication Interfaces: 2 x Ethernet + RS485 1 x Ethernet + RS485 (simplified interface)

I/O Capacity: High-density DI/DO Standard DI/DO (reduced scalability)

Approvals: Global (UL/CE/IEC) Regional (e.g., CE only)

Typical Applications: Complex power distribution/new energy Simple feeder/OEM integration

Note: For specific function reductions, please refer to the ABB manual (document library link).

Core functions retained

Basic protection

Three-stage overcurrent protection (phase/zero sequence)

Ground fault protection

Voltage/frequency protection

Optional automatic reclosing (ARC)

Measurement and monitoring

Current/voltage/power measurement

Event logging and fault alarm

Communication protocol

Supports IEC 61850 (Basic Edition)

Modbus RTU/TCP

Design optimization

Cost control

Removal of advanced algorithms such as distance protection

Reduced number of communication interfaces

Simplified installation

Fixed terminal block (modular expansion not supported)

DIN rail mounting only (no panel cutout option)

Environmental adaptability

Standard temperature range (-25°C to +70°C)

Typical Applications

Building Power Distribution: 10kV Incoming Line Protection for Buildings

Industrial OEM Equipment: Integration into Motor Control Cabinets

Simple Branch Feeder: Radial Networks Without Distance Protection

Retrofit Project: Replacement of Older Overcurrent Relays (Low-Cost Upgrade)