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35kV epoxy resin cast dry-type transformers (SCB11/SCB12 series) are meticulously developed for 35kV/0.4kV 50Hz medium-high voltage power distribution networks. These units are widely deployed across Zambia's large open-pit mines, centralized photovoltaic power stations, heavy industrial zones, urban central substations, underground power rooms, tunnel power supply setups, and high-density commercial and hospital projects. All products comply strictly with IEC 60076-11, GB 1094, and GB/T 10228 standards. The fully oil-free design completely eliminates oil leakage, fire hazards, and explosion risks, allowing for secure installation indoors, underground, and in crowded public areas without the need for expensive fire isolation pools. To match the diverse long-term operational budget demands of African mining and solar PV projects, we provide two precise unit price options for our all-copper winding units: 0.0901 USD/W (Standard SCB11) and 0.102 USD/W (Ultra-low loss SCB12).
Backed by our senior engineering team and advanced temperature field simulation analysis, the 35kV high-voltage winding adopts a multi-layer thickened composite insulation structure. This highly engineered system delivers a lightning impulse withstand voltage up to 200kV and a 95kV power frequency withstand for 1 minute, providing a massive insulation safety margin. It effectively withstands the severe voltage fluctuations, frequent lightning strikes, and switching surges typical of Zambia’s unstable 35kV overhead mining grid, actively preventing insulation breakdown and surface creepage discharge. The full vacuum pressure epoxy integral casting process eliminates internal air bubbles entirely, ensuring a partial discharge of ≤5pC. This patented high-temperature hybrid insulation system guarantees stable performance under long-term high voltage, offering excellent resistance to dust and humidity while aligning the core components' durability with the machine's overall design life.
Our manufacturing process relies on a stringent raw material traceability system to guarantee top-tier performance from the source. The windings adopt high-conductivity 99.99% oxygen-free copper wire and copper foil, delivering outstanding short-circuit impact resistance, exceptionally low temperature rise, and a service life extending well beyond 30 years. The iron core utilizes premium cold-rolled high-permeability low-loss oriented silicon steel, assembled using a precise step overlap cutting process. This meticulous craftsmanship drastically cuts no-load loss and minimizes running noise to a barely perceptible hum. We offer two distinct price grades for project selection:
0.0901 USD/W: The SCB11 standard energy efficiency model features a lower initial procurement cost, making it perfectly fit for short-cycle temporary construction projects or budget-constrained installations.
0.102 USD/W: The SCB12 ultra-low loss energy-saving model significantly reduces long-term electricity expenditures. It is the ideal choice for 24-hour continuous mining operations and photovoltaic power plants, with a unit price premium of approximately 13.21%.
Engineered with exceptional weather resistance and seismic adaptability, this dry-type transformer contains no flammable insulating oil inside. The imported flame-retardant epoxy resin is entirely self-extinguishing and releases no toxic fumes during combustion, ensuring a clean, odor-free environment. To combat harsh external conditions, we provide an optional IP20 or IP23 metal protective enclosure crafted with anti-UV and anti-corrosion sealing materials. This multi-level customized housing perfectly copes with Zambia's year-round high temperature and high humidity tropical environment, supporting stable operation even in 100% humidity, extreme temperature swings from -40℃ to 55℃, and heavy dust. It comprehensively resists chemical gases, light salt fog, and air pollutants. Because there is no fire risk, no fire separation civil construction is required, saving significant investment in power room infrastructure.
Designed for modern industrial and renewable energy demands, this unit features an optional Class F (155℃) or Class H (180℃) high-temperature insulation system. It is equipped with intelligent axial cooling fans that support a 140% short-time overload capacity under forced air cooling. The optimized winding structure effectively suppresses heavy harmonics generated by mining equipment and PV inverters, keeping running noise at a quiet ≤54dB at 1 meter. Furthermore, it integrates a smart power monitoring and comprehensive temperature protection system. This standard intelligent temperature control setup includes an over-temperature alarm, overheat trip protection, and RS485 remote communication for real-time online data acquisition. This IoT integration empowers modern energy projects to execute predictive maintenance and optimize overall energy efficiency.
Because this dry-type transformer contains no insulating oil, the logistics and upkeep are remarkably streamlined. There is no need for oil draining, hot air drying, or nitrogen sealing pretreatment before air freight. Only a standard magnetic inspection report is needed for airline acceptance, which saves massive pre-transport labor and material costs compared to traditional oil-immersed transformers. Once installed, the daily maintenance routine is incredibly simple, requiring only regular dust cleaning rather than messy oil testing or replacement work. The tactile absence of greasy residues and the elimination of oil-leakage odors make the operational environment cleaner and safer. This hassle-free maintenance profile is highly suitable for remote mining areas in Zambia where specialized maintenance staff may be insufficient.
We enforce a strict 100% finished product full-inspection protocol—encompassing rigorous visual and functional testing—to ensure every unit passes all routine and type tests on the first try, guaranteeing zero-defect delivery. We provide robust ISPM15 fumigated wooden case packaging, arrange efficient air and sea logistics directly to Zambia, and supply full customs clearance documents: factory type test reports, CE, IEC, ISO9001 certificates, magnetic inspection certificate, commercial invoice, and packing list. Clients benefit from a 3-year global full machine warranty, lifelong spare parts supply at factory cost, a comprehensive English operation and maintenance manual, and on-site installation technical guidance available upon request.
Rated Capacity & Tap Range | Customizable capacity; 35kV tap range (±2×2.5% / ±5%) |
Connection Group | Dyn11 / Yyn0 |
Custom Options | Short-circuit impedance, enclosure grade, mining anti-surge reinforced coils, optional off-circuit / on-load tap changer |
A: Yes, absolutely. Because there is no flammable insulating oil inside, the unit is not classified as dangerous goods. Only a magnetic inspection report is required before shipment. You completely bypass the tedious oil draining, drying, and nitrogen sealing procedures required for oil transformers, saving substantial pre-shipment costs and shortening the delivery cycle significantly.
A: The 0.0901 USD/W option is our standard SCB11 model, designed with a lower upfront procurement cost. The 0.102 USD/W option is the SCB12 ultra-low loss energy-saving version, which drastically cuts long-term electricity operational costs, carrying a unit price premium of around 13.21%. Both models feature premium 99.99% pure copper windings and step-overlap silicon steel cores.
A: We ensure a smooth import process by providing a complete documentation package. This includes the ISO9001 quality certificate, CE certificate, complete IEC factory test reports, ISPM15 fumigation certificate, magnetic inspection report, commercial invoice, and packing list. We offer full document guidance tailored for local Zambian clearance.
A: Fully customizable. We precisely adjust the high-voltage tap range, short-circuit impedance, insulation levels, and coil reinforcement according to your local grid's voltage fluctuations, lightning strike frequency, and specific mining short-circuit risks, ensuring perfect compatibility.
A: We back our products with a comprehensive 3-year full machine global warranty. Complete English operation and maintenance manuals, along with detailed installation videos, are provided. Professional technical engineers can be dispatched directly to Zambia for on-site commissioning upon request, and we supply spare parts at factory cost for the lifetime of the transformer.
