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DMAG.105 Transformer Demagnetization Tester

DMAG
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The DMAG.105 Transformer Demagnetization Tester is designed to eliminate hazards of residual magnetism after DC resistance testing of large power transformers. Residual magnetism in transformer cores can cause half-saturation, excessive harmonic generation, increased reactive power consumption, and potential relay malfunctions when the transformer is energized.

By applying advanced DC frequency attenuation technology, the DMAG.105 ensures safe commissioning by effectively removing residual magnetism. Compact, lightweight, and portable, it is well-suited for both laboratory and field applications.

Key Features

  • Uses patented DC frequency attenuation technology

  • For three-phase transformers, only B-phase demagnetization required

  • Automatic flow stabilization with 16AD data collection and processing

  • Dual operation modes: manual and automatic

  • Fast demagnetization – under 4 minutes

  • Highly effective – over 90% per cycle

  • Directly compatible with DC resistance test current lines

  • Displays demagnetization current, time, and progress

  • Suitable for 35kV and above transformers, PTs/CTs, and especially 330kV+ large-capacity transformers

  • Compact and lightweight, optimized for field testing

Technical Specifications

Demagnetization Current

  • 5A

  • 1A

  • 200mA

  • 5mA
    (customizable)

Demagnetization Way

  • Manual mode

  • Automatic mode

Demagnetization Time

  • Manual: 4 minutes per cycle

  • Automatic: 9 minutes per cycle (no need to consider voltage grade or capacitor)

Demagnetization Effect

  • Over 90% reduction per cycle

Demagnetization Process

  • 0–100% automatic recording and erasing time

Working Power

  • AC 220V ±10%, 50Hz ±1Hz

Operating Conditions

  • Temperature: –25℃ to +50℃

  • Humidity: ≤90% RH

Weight

  • 5 kg (net, excluding connection wires)

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