ABB REF541KM115AAAA Relay Feeder Protection Relay

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Product Overview

The ABB REF541KM115AAAA is a high-performance feeder protection relay designed for medium-voltage distribution systems to protect, measure, and control feeders. It integrates overcurrent, directional, differential, and adaptive protection functions, with advanced communication interfaces for seamless integration with SCADA/DCS systems, enabling remote monitoring and automation management.

Technical Specifications

• Model: REF541KM115AAAA

• Type: Feeder Protection Relay

• Rated Voltage: AC 110–220 V or DC 48–125 V (depending on version)

• Current Input: CT (Current Transformer) inputs

• Protection Functions: Overcurrent (50/51), overload, instantaneous overcurrent, undercurrent, directional overcurrent, distance protection (optional), adaptive protection

• Communication Interfaces: IEC 61850, Modbus, DNP3, Profibus

• Digital I/O: Multiple digital inputs/outputs, expandable

• Analog Measurements: Voltage, current, active/reactive power, frequency

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

• Protection Rating: IP20 (installed inside control cabinet)

• Mounting: Panel mount or DIN rail

• Standards: IEC 60255, IEC 61850, IEEE

Advantages and Features

1. Multi-Function Protection
   Integrates overcurrent, undercurrent, directional overcurrent, instantaneous overcurrent, and distance protection to ensure feeder safety.

2. Advanced Measurement and Monitoring
   Measures current, voltage, active/reactive power, frequency, providing system status information.

3. Communication and Automation Integration
   Supports IEC 61850, Modbus, DNP3 protocols for remote monitoring and intelligent control.

4. Flexible Installation and Expandability
   Modular design supports digital/analog I/O expansion to meet different feeder protection requirements.

5. Industrial-Grade Reliability
   Wide temperature range and high immunity to interference, suitable for harsh industrial environments.

6. User-Friendly Interface
   LCD display with function keys for easy on-site configuration and parameter setup.

Typical Applications

• Medium-voltage distribution feeder protection

• Industrial plant power distribution networks

• Utility grid feeder monitoring

• Power plants, substations, and distribution automation

• Water treatment, petrochemical, metallurgical, and mining industries

Precautions

1. Power Supply Matching
   Ensure the relay supply voltage meets specifications (AC/DC range).

2. Correct Wiring
   Ensure proper wiring of CTs, digital I/O, and communication ports to avoid maloperation.

3. Environmental Conditions
   Avoid installation in high humidity, corrosive, or high electromagnetic interference environments.

4. Regular Maintenance and Testing
   Periodically check relay operation and communication status; perform relay testing when necessary.

5. Parameter Setting
   Set relay protection curves and parameters according to feeder characteristics and protection scheme.