Product Overview

• Part No: MFAC34N1AA0001A
• Brand: ALSTOM

• Category: Three-Element High Impedance Differential Protection RelayMFAC34N1AA0001A belongs to ALSTOM MFAC series three-element static high impedance differential relay. Adopting high impedance differential principle, it offers excellent stability against external through faults and rapid tripping for internal short-circuit and earth faults. Each phase channel supports independent adjustable operating voltage setting. Equipped with transparent protective cover and standard plug-in housing, it serves as critical spare equipment for busbar protection, generator stator restricted earth fault protection and transformer winding differential protection panels.

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Core Features

• Three independent protection elements for three-phase high impedance differential applications
• Superior stability under external through faults, fast operation for internal zone faults
• Continuously adjustable operating voltage setting for flexible coordination with current transformers
• Transparent front cover for convenient parameter adjustment and status inspection
• Standard plug-in modular construction supporting quick on-site replacement
• Built-in surge suppression circuit with strong immunity to substation electromagnetic interference

• Passed EMC, vibration and thermal cycling long-term reliability tests

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Technical Specifications

• Auxiliary Supply: 110V/220V AC/DC
• Rated CT Input: 1A / 5A
• Operating Frequency: 50/60Hz
• Operating Temperature: -20°C ~ +60°C
• Storage Temperature: -40°C ~ +85°C
• Installation: Chassis plug-in mounting

• Front Protection Class: IP40

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Compatibility & Application

• Compatible with ALSTOM legacy secondary protection cabinet systems
• Widely applied in thermal power plants, captive power stations and high voltage substations
• Used for busbar protection, generator restricted earth fault protection and transformer winding unit protection