Oil-Type Transformers
Waiting months on imported transformers while your project stands still?
De-risk your critical path with 100% locally manufactured oil-immersed transformers
- Fast-track turnaround:
6–8 week manufacturing lead times. - Stringent standards:
Built in accordance with SANS 780 Edition 4 / 5.1 and IEC 60076. - Application-specific engineering:
Optimized for solar inverter harmonics, heavy industrial plant feeds, and mining distribution. - Commercial certainty: Zero port delays, zero shipping logjams, and no FX exposure.
100% Local In-House Manufacturing
Engineered and built in Johannesburg from 100 kVA to 3 150 kVA at operating voltages up to 33 kV. Maximize your preferential B-BBEE procurement scorecard while eliminating the risk of international shipping bottlenecks.
Refurbishments, Rewinds & In-House Oil Processing
Comprehensive asset lifecycle support delivered at our Chloorkop facility: complete mechanical rewinds, core restoration, tank recoating, and routine diagnostic testing under ISO 9001:2015 quality systems. Supported by an in-house high-vacuum oil purification plant (3 000 l/h with vacuum booster) providing single-pass moisture extraction, degasification, and dielectric restoration. All overhauls backed by a 12-month warranty.
Accredited Routine Testing & Quality Verification
Every unit undergoes rigorous evaluation in our accredited on-site test bay prior to dispatch. Standard routine verification includes winding resistance, precision turns ratio/vector checks, load/no-load losses, applied AC dielectric withstand testing, and hermetic seal pressure validation.
How we can Empower you
Turnkey Local Fabrication from 100 kVA to 3150 kVA (Up to 33 kV)
Engineered and manufactured locally at our dedicated 5,500 m² Chloorkop heavy industrial facility, RMM delivers high-reliability oil-immersed distribution transformers and miniature substations. Designed for severe-duty operational environments including mining, heavy processing plants.
Heavy Industrial, Mining & Severe-Duty Substation Units
Oil-immersed distribution transformers built for demanding operations, including smelting plants, surface mining, processing facilities, and underground drives. Engineered with seam-welded base skids, robust ingress protection (IP23 up to IP54), and resilience against dynamic motor-starting loads, heavy dust, and high ambient heat.
Utility-Scale & Bulk Power Supply
Strategic supply capabilities for large-scale power transformers rated up to 200 MVA with operating voltages reaching 220 kV. Full procurement, logistics management, factory acceptance testing (FAT) oversight, and technical documentation for bulk transmission and heavy industrial feeds.
| Parameter | Specification / In-House Capability |
|---|---|
| Power Capacity | 100 kVA to 3 150 kVA (up to 3.15 MVA) |
| Operating Voltages | Up to 33 kV |
| Design Compliance | SANS 780 Edition 4 / 5.1, IEC 60076, ISO 9001:2015 |
| Lead Times | Approximately 6 to 8 working weeks (specification dependent) |
| Typologies Produced | Distribution, Power, Converter, Auto, and Rectifier configurations |
| Winding Conductors | High-purity electrolytic copper or electrical-grade aluminum |
| Substation Packaging | Skid-mounted units, vertical winder-cage slung, or modular containerized housings |
| Switchgear Integration | Pre-wired internal MV SF6 Ring Main Units (RMU) and LV air/moulded circuit breakers |
| Enclosure Protection | IP23, IP33, IP44, up to IP54; continuous seam-welded structural base skids |
| Warranty Assurance | 12-month standard manufacturer warranty |
Why Partner With Us?
We pride ourselves on delivering turnkey solutions with continued support. When you partner with us, you have guaranteed access to the following:
- Competitive pricing
- On-site analysis of your network
- Data-based reporting with our expert recommendations
- Design and engineering with world-leading EPLAN software
- Preferred electrical components like ABB, Schneider
- we are able to fully customise your unit with your preferred switchgear-if available at the time of procurement
- Installation and commissioning service
Request a quote:
011 794-9498
sales@redmetal.co.za
Power Projects
2 x 315kVA Oil Cooled Surface Mini Substations Manufactured
RMM successfully manufactured and delivered two 315 kVA 11 kV / 400 V oil-type surface mini substations for a plant in Cape Town. The project was completed on schedule and received positive client feedback. We remain committed to delivering high-quality transformer...
1 x 1000kVA Oil Cooled Transformer Manufactured
RMM manufactured its first oil-cooled transformer at its state-of-the-art facility in Chloorkop, Edenvale. The unit, rated at 1,000kVA, 11kV / 400V (ONAN), was designed and built in accordance with SANS 780, with all routine tests successfully completed. The client...
Need to Replace or Refurbish an Existing Unit?
A failed or ageing transformer doesn’t always mean a new unit. We assess, repair and refurbish oil-immersed transformers of any manufacture and when replacement is the right call, local production means you’re not waiting on a ship
Condition Assessment & Oil Analysis
On-site inspection, oil sampling and DGA testing to determine remaining asset life — with a clear report and recommendation: repair, refurbish or replace.
Upgrades to Current Standards
Replace legacy units with modern low-loss SANS 780 designs that cut no-load losses and reduce your energy bill from day one.
Repairs & Refurbishment
Cost-effective factory refurbishment including tank, cooling and gasket renewal that returns units to service at a fraction of replacement cost.
Rapid Manufacture & Delivery
Local manufacture means 6–8 week lead times on custom units compared to months for imported alternatives keeping shaft-sinking and development schedules on track
