ALSTOM MAVS01L1AB0751D Multifunction Protection Relay

Overview

The MAVS01L1AB0751D monitors three-phase currents and voltages, providing a wide range of protection elements. It is typically used in distribution substations, industrial plants, and utility networks to protect feeders, transformers, and motors. The relay features a graphical LCD display, programmable logic, and multiple communication options for easy integration into automation systems.

Key Features

• Protection Functions: Phase overcurrent (50/51), Earth fault (50N/51N), Overvoltage (59), Undervoltage (27), Voltage unbalance (47), Directional overcurrent (67) optional.

• Measurement: True RMS of currents and voltages, power, energy, frequency.

• Programmable Logic: Configurable logic equations for custom interlocking and control.

• User Interface: Large graphic LCD with multi-language support and keypad.

• Communication: RS485 with Modbus RTU, Profibus DP, or IEC 61850 (optional).

• Event & Fault Records: Up to 256 time-stamped events, fault record with waveform capture.

• Digital I/O: 8 digital inputs, 6 output relays (expandable via I/O modules).

• Self-Monitoring: Continuous hardware and software supervision with watchdog.

Technical Specifications

• Nominal Current: 1 A or 5 A (field selectable).

• Nominal Voltage: 100-240 VAC / 110-250 VDC auxiliary supply.

• Current Inputs: 0-20 A RMS continuous, 100 A for 1 s.

• Voltage Inputs: 0-150 VAC phase-to-neutral.

• Frequency: 50/60 Hz auto-sensing.

• Overcurrent Accuracy: ±2% or better.

• Output Contacts: 6 form-C, rated 8A / 250 VAC.

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

• Enclosure: Flush mount, 96 x 96 mm (¼ DIN).

• Certifications: IEC 60255, CE, UL.

Applications

The MAVS01L1AB0751D is suitable for a wide range of medium voltage applications:

• Feeder protection in distribution networks.

• Transformer protection (as primary or backup).

• Motor protection (with thermal overload model).

• Generator protection for small generators.

• Capacitor bank protection (with overvoltage and unbalance).

Configuration and Integration

The relay is configured using ALSTOM’s intuitive software, which allows setting protection parameters, logic programming, and communication setup. The front panel provides local access for monitoring and control. The relay supports various communication protocols, enabling seamless integration with SCADA and substation automation systems. Its compact size and modular design make it easy to retrofit into existing panels.

In summary, the ALSTOM MAVS01L1AB0751D multifunction protection relay delivers robust and flexible protection for medium voltage assets, helping to ensure continuity of service and reducing downtime.