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35kV oil-immersed distribution transformers are specially designed for 35kV/0.4kV, 50Hz medium-high voltage power distribution systems, widely used in Zambia large open-pit mines, centralized photovoltaic power stations, heavy industrial parks, rural overhead power grids and urban primary substation construction projects.
Products strictly implement IEC 60076 international standard and GB 1094, GB/T 6451 national standards. Adopting mineral insulating oil for insulation and heat dissipation, the product features mature process, low initial procurement cost, strong overload resistance and stable high-voltage operation performance. Our factory supplies full series S11 standard efficiency & S13 ultra-low loss all-copper winding transformers, with two unified quotation standards for overseas projects: 0.0901 USD/W and 0.102 USD/W, adapting to different long-term power consumption budget demands of African mining and photovoltaic projects.
The high-voltage winding adopts an advanced multi-layer thickened composite insulating paper wrapping process, achieving a remarkable lightning impulse withstand voltage up to 200kV with a highly sufficient insulation safety margin. This specialized structural engineering can effectively resist frequent lightning strikes, switching overvoltage, and the severe voltage fluctuations typical of Zambia's unstable 35kV overhead power grid, completely avoiding insulation breakdown and surface creepage discharge faults. Furthermore, all coils are precision-wound with 99.99% oxygen-free pure copper wire. Utilizing a concentric coil design combined with high-strength binding and internal anti-loosening nuts, the assembly delivers superior mechanical strength and strong anti-short-circuit impact ability. This ensures the coils will never deform during sudden short-circuit impacts or bumpy long-distance transportation. The exceptional conductivity and optimized design allow the unit to operate stably for a long time under harmonic interference (maintaining total harmonic distortion <5%) generated by heavy mining equipment and photovoltaic grid-connected inverters.
The iron core is meticulously crafted from high-permeability, low-loss oriented cold-rolled silicon steel sheets. By adopting the advanced Step Overlap (full miter lap cutting) and no-hole binding technology, we significantly reduce magnetic flux leakage, no-load loss, and operational humming noise, optimizing overall power quality. We offer two distinct quotation schemes for differentiated project selection, ensuring exact alignment with your capital expenditure and operational expense goals:
0.0901 USD/W: The S11 standard energy efficiency model offers a low one-time purchase cost. It is highly suitable for short-cycle temporary construction projects, auxiliary mining facilities, or developments where initial capital conservation is prioritized without sacrificing baseline reliability.
0.102 USD/W: The S13 ultra-low loss energy-saving model is engineered for maximum efficiency, greatly reducing long-term electricity operating expenses. It is the optimal choice for mines and centralized photovoltaic power stations running 24 hours continuously. Although the unit price is about 13.21% higher than the standard model, the accelerated return on investment through energy savings makes it highly economical over the equipment's lifecycle.
Our advanced vacuum oil filling process guarantees that the insulating oil realizes its dual functions of dielectric insulation and rapid heat dissipation flawlessly by thoroughly eliminating internal moisture and micro-bubbles. The high-mechanical-strength tank is equipped with precision-welded corrugated radiators for highly efficient natural ONAN heat dissipation. This fully sealed and maintenance-free design completely isolates the internal components from external air and moisture, effectively delaying insulating oil aging and drastically lowering lifecycle maintenance costs. External cooling fans can be optionally equipped to support an impressive 120% short-time overload operation during peak demand spikes. The standard complete set of accessories includes an oil conservator, explosion-proof pressure relief valve, clear oil level indicator, drain valve, sensitive winding temperature sensor, grounding bolt, heavy-duty lifting lugs, anti-theft oil plug, and transportation fixing supports, fully matching Zambia's demanding outdoor field installation conditions.
Engineered for extreme environment and seismic adaptability, the transformer tank is constructed from thickened steel plate and features an internal anti-displacement positioning structure to meet high seismic grade requirements. The exterior is treated with a rigorous triple anti-corrosion process: deep sandblasting derusting to create a tactile bonding surface, a heavy-duty anti-rust primer, and an outdoor weather-resistant topcoat. This robust shield can resist the year-round high temperature, high humidity, and light salt fog environments prevalent in Zambia, supporting a wide operating temperature range from -40℃ to +55℃. All sealing gaskets adopt high-temperature resistant nitrile rubber to prevent any oil leakage during decades of continuous outdoor operation. Each product passes a strict air tightness leakage test before delivery, ensuring it can be directly installed outdoors in harsh mining or solar field conditions without the heavy expense of building a special power distribution room.
Understanding the critical timelines of international infrastructure development, we offer flexible and secure logistics solutions tailored to your project schedule:
Sea freight: We fill the unit with full qualified insulating oil before delivery and pack it securely within an ISPM15 certified fumigation wooden case. This method offers a low comprehensive logistics cost and is highly suitable for bulk batch orders and planned inventory stocking.
Air freight (compulsory pre-processing): For urgent project deadlines, we provide a specialized air freight preparation protocol. 1. Completely drain all insulating oil from the main tank, radiators, and oil conservator. 2. Carry out intensive hot air circulating drying to remove any residual oil film on the coil and tank inner wall. 3. Seal all nozzles and fill with dry nitrogen (dew point ≤-40℃) for pressure maintaining and absolute sealing. 4. Apply for the mandatory magnetic inspection report and non-dangerous goods appraisal document for airline acceptance. Please note that additional service charges will be incurred for the oil draining, drying, and nitrogen sealing processes, which dry-type transformers do not need to go through.
We deliver comprehensive management systems and international qualifications, holding ISO 14001 environmental and ISO 45001 occupational health and safety certifications to seamlessly meet the compliance reviews of large multinational projects and government tenders. Customizable parameters include rated capacity, 35kV tap range (±2×2.5% / ±5%), Dyn11/Yyn0 connection group, short-circuit impedance, mining anti-surge reinforced coil structure, and specialized anti-theft oil plug designs. An on-load tap changer can be selected for areas with severe grid voltage fluctuation. Before leaving our facility, 100% of units pass rigorous testing including temperature rise, lightning impulse, partial discharge, and sound level checks to ensure zero-defect delivery. We provide a full set of documents for smooth Zambia customs clearance: commercial invoice, packing list, fumigation certificate, factory type test report, ISO9001/CE/IEC certification, magnetic inspection certificate (for air shipment), and non-hazardous goods identification. Backed by a 3-year global whole machine warranty and a lifelong supply of spare parts at factory cost, each unit is equipped with a complete English version installation and operation maintenance manual. Professional technical engineers can be arranged to travel to Zambia for on-site installation guidance and commissioning according to customer requirements.
A: Yes, but a full set of mandatory pre-treatment is required before shipment to comply with aviation safety regulations: 1. Completely drain all insulating oil inside the transformer; 2. Conduct hot air drying to remove residual oil traces inside the tank and coils; 3. Seal all openings and fill with dry nitrogen for pressure preservation; 4. Provide a magnetic inspection report and non-dangerous goods identification certificate for airline acceptance. Extra fees will be incurred for the above operations, which are not required for dry-type transformers.
A: 0.0901 USD/W corresponds to the S11 standard loss model, which features a lower initial purchase cost ideal for budget-conscious or temporary setups. 0.102 USD/W represents the S13 ultra-low loss energy-saving model, which can effectively reduce long-term electricity operational costs, with a unit price increase of about 13.21%. Both models adopt a highly reliable full pure copper winding structure and undergo the same rigorous vacuum oil filling process.
A: To ensure immediate readiness upon arrival, the standard delivery includes an oil conservator, explosion-proof pressure relief valve, clear oil level gauge, heavy-duty drain valve, winding thermometer, grounding terminal, lifting lugs, anti-theft oil plug, and transportation fixing brackets designed to resist transit vibrations.
A: Yes, absolutely. We utilize a thickened steel tank treated with a multi-layer weather-proof anti-corrosion coating. Combined with high-temperature resistant nitrile rubber sealing components, this design completely avoids oil leakage under long-term high temperatures (up to +55℃) and UV exposure. It is fully sealed and maintenance-free, allowing it to be safely installed outdoors without the need for a special power distribution room.
A: We supply a comprehensive documentation package to prevent any border delays, including the ISO9001 quality certificate, CE certificate, complete IEC & GB factory test reports (covering partial discharge and lightning impulse), fumigation certificate, commercial invoice, packing list, magnetic inspection report (for air freight), and non-hazardous goods identification document. We provide targeted document guidance tailored specifically for local customs clearance procedures.
A: We stand behind our engineering with a solid 3-year global whole machine warranty. Complete English operation and maintenance manuals, along with detailed installation videos, are delivered together with the goods. Spare parts are reliably supplied at factory cost for the life of the product. Furthermore, professional technical engineers can be dispatched to your site in Zambia for hands-on installation guidance, commissioning, and operational training as required by your project team.
