Mini-sub Transformers

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  • 315-1250kva
  • 11kv to 400v
  • Mining Underground/Surface (non-flameproof)
  • Municipal, Residential, Commercial & Industrial applications
  • Rewind & refurbishment of transformer windings
  • New & Refurbished LV & HV compartments
  • New & refurbished Ring Main Units
  • Mechanical repairs & renewal
  • Fire/Arc protection

Our transformer repair facility is fully equipped to handle repairs and refurbishments for transformers ranging from 10kVA to 200MVA at 275kV, including reactors and regulators. Our advanced equipment and expert technicians ensure that your transformer components are returned to full operational capacity, adhering to the highest industry standards

Facility Features:

  • 160-Ton Overhead Crane Capacity
    Our facility is capable of handling large transformers, allowing us to manage even the most complex repair and refurbishment projects efficiently and safely.

  • Automated Vacuum Ovens
    Equipped with nitrogen injection and oil spraying processing, our three vacuum ovens ensure that all active parts of the transformers are dried to the highest standards before tanking. This process is critical for ensuring the longevity and reliability of transformer components.

  • Test Bay Facility
    Our test bay can perform tests up to 350kV and 200Hz, ensuring that all transformers are tested in compliance with IEC and BS standards

  • Pressurised Electrical Assembly Facility
    Our pressurised assembly area allows for precise and safe electrical assembly, reducing the risk of contamination and ensuring the highest levels of build quality for all transformer components.

  • MV Impulse Test Facility
    We also provide medium-voltage impulse testing to ensure that your transformers can withstand electrical stresses and meet all required safety standards.
    In addition to repairs and refurbishments, LH Marthinusen specializes in the manufacture of furnace, rectifier, dry type, and distribution transformers, as well as the complete repair of both underground and surface miniature substations. We offer end-to-end services to ensure that your transformers continue to operate efficiently, regardless of the application.

We offer custom transformer design services to meet your specific operational requirements. We design and manufacture transformers up to 80MVA and 275kV to match customer specifications, ensuring tailored solutions that provide reliable performance in demanding environments.

Our team utilizes in-house 3D CAD design capabilities, which allow us to create custom designs that meet the precise needs of your project.

With years of experience in the industry, LH Marthinusen is recognized for delivering reliable transformer solutions across a range of industries, including rail, mining, energy, and manufacturing.

Reactors, Regulators & NEC’s

Traction Transformers

Power/Distribution Transformers

For medium and low voltage substations, utilities, and general industrial use.

Furnace Transformers

High-current transformers engineered for electric arc and induction furnaces in metallurgy.

Rectifier Transformers

Custom-built transformers for DC power conversion, used in electrochemical and refining industries.

Traction Transformers

Transformers for rail and transport infrastructure requiring stable voltage under load variation.

Mini-sub Transformers

Integrated transformer units combining switchgear, ideal for urban or remote power distribution.

Reactors, Regulators & NEC’s

Used for voltage control, power factor correction, and harmonic filtering in sensitive industrial systems

Dry Type Transformers

Air-cooled transformers suitable for indoor and hazardous environments with low fire risk.

Transformer Oil Facility

Purification, testing, and refilling of transformer oil using mobile rigs and testing equipment.