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15kV oil-immersed power transformers are widely used for 15kV/0.4kV 50Hz power distribution systems, engineered specifically to handle the rigorous demands of Zambia mining areas, rural overhead power grids, industrial plants, photovoltaic power stations, and rural infrastructure projects. The product complies with IEC 60076 and GB 1094 international and national standards, adopting premium mineral insulating oil for optimal cooling and dielectric insulation. Beyond its foundational function, this equipment features low manufacturing cost, strong overload capacity, stable high voltage performance, and exceptionally easy on-site maintenance. We supply full series energy efficiency models S11/S13/S15, all built with a robust all-copper winding structure that delivers a reassuringly low acoustic hum during operation. Two unit price standards are available: 0.0901 USD/W & 0.102 USD/W for clients to select according to their specific operational budget and long-term energy consumption goals.
The high voltage winding adopts a precision-engineered multi-layer paper insulation design, featuring an enhanced lightning impulse withstand level to actively resist frequent lightning surges and the unpredictable voltage fluctuations typical of Zambia’s 15kV overhead rural power networks. All internal coils use 99.99% oxygen-free pure copper wire, ensuring excellent conductivity, strong anti-short-circuit ability, and stable long-term operation even under severe mining harmonic loads. To guarantee this level of reliability, our manufacturing process incorporates strict quality control and factory inspection protocols. Every spool of copper wire and batch of silicon steel is fully traceable through our ISO-certified management system. Before leaving the facility, each unit undergoes a 100% full inspection, including rigorous visual assessments and functional dielectric testing, completely eliminating concerns about premature failure and ensuring the equipment performs flawlessly from the moment it is energized.
The transformer core adopts high-grade, low-loss cold-rolled oriented silicon steel sheets, assembled using a full miter lap cutting process. This precise geometric stacking minimizes magnetic flux leakage, effectively reducing both no-load loss and the audible running noise, resulting in a quiet, highly efficient energy transfer. We offer two distinct price grades to align with different project lifecycles and capital expenditure plans:
0.0901 USD/W: The standard S11 energy efficiency model. This option provides an excellent balance of performance and initial purchase economy, making it highly cost-effective for short-term use projects, temporary mining expansions, or infrastructure developments with strict upfront capital limits.
0.102 USD/W: The ultra-low loss S13/S15 high-efficiency model. Engineered for lower electricity consumption, this unit is ideal for 24h continuous mining operations and PV stations where long-term energy savings compound rapidly. The unit price premium is around 13.21%, an investment that typically pays for itself through significantly reduced grid power waste over the equipment's lifespan.
Our specialized mineral insulating oil realizes dual cooling and insulation, flowing smoothly through the internal channels to draw heat away from the copper coils. The unit is equipped with a heavily finned corrugated radiator for natural heat dissipation; optional external cooling fans can be integrated for short-time 120% overload operation during peak demand spikes. Safety and temperature control are paramount in our design. The system features a complete oil conservator (conservator tank) that accommodates oil expansion, alongside an explosion-proof pressure relief valve, a precise oil level gauge, a heavy-duty drain valve, and a sensitive temperature sensor. These standard accessories form a comprehensive safety net, preventing leaks and mitigating pressure buildup, ensuring absolute safety even during unexpected heavy load faults. This meticulously sealed environment fully matches Africa's demanding outdoor installation conditions.
The tank body adopts a thick, industrial-grade steel plate that undergoes a rigorous surface treatment: deep sandblasting followed by a heavy-duty anti-rust primer and an outdoor weather-proof topcoat. Running your hand along the exterior reveals a smooth, hardened finish that is highly resistant to tropical high temperatures, intense UV exposure, heavy humidity, and the light salt fog frequently encountered in specific Zambian regions. We have engineered this equipment for extreme operating environments, ensuring stable performance across wide temperature fluctuations and elevated altitudes. All sealing gaskets use specialized high-temperature resistant rubber, maintaining their elasticity to effectively prevent oil leakage under long-term outdoor operation. The robust environmental protection means the unit can be directly installed outdoors on a concrete pad without the immense expense of constructing a dedicated, climate-controlled power distribution room.
Understanding the critical nature of international project timelines, we provide comprehensive packaging and loading schemes tailored for safe transit to African destinations. Each unit is secured in a standard export fumigation wooden case, structurally reinforced to prevent shifting during transit. We provide accurate gross weight estimations and container loading layouts to help procurement teams optimize freight space and calculate logistics costs down to the dollar.
Sea shipment: Delivered as a complete set with full oil filling inside standard export fumigation wooden cases. This method offers a low overall logistics cost and is highly suitable for large volume orders where container space can be maximized.
Air shipment: For urgent project deadlines, air freight is available, but requires strict compliance protocols. We must fully drain all insulating oil, perform internal hot air drying, and fill with dry nitrogen sealed to maintain internal pressure. We then provide a magnetic test report & non-dangerous goods identification document before air delivery. Compared with a dry-type transformer, extra cost for oil draining, drying, and nitrogen sealing is required for air transport, but it guarantees the fastest possible delivery to your site.
We offer extensive customizable parameters to perfectly match your grid requirements: Rated capacity, 15kV tap range (±2×2.5% / ±5%), Dyn11/Yyn0 connection group, short-circuit impedance, specialized anti-theft structures, and mining special anti-surge designs. Backed by an automated production line and immense factory capacity, our standard lead time is a highly predictable 1-3 months, proving our capability to fulfill large-scale infrastructure and mining batch orders reliably. To facilitate smooth international transactions, we support flexible trade terms including FOB, CIF, and EXW, alongside secure payment methods like T/T and L/C. We supply complete export documents for Zambia customs clearance: Commercial invoice, packing list, fumigation certificate, factory test report, and magnetic inspection certificate (for air freight). Every unit is backed by a 3 years full machine warranty, lifelong spare parts supply at factory cost, and a professional installation operation manual in English.
A: Yes, air freight is entirely possible for urgent project requirements, but it involves mandatory pre-treatment steps to comply with aviation safety regulations:
1. Fully drain all insulating oil inside the main tank, corrugated radiator, and conservator; 2. Perform intensive hot air drying to completely remove any residual viscous oil film on the internal copper coil & tank wall; 3. Seal all connection ports and fill the void with dry nitrogen for pressure maintenance during the flight; 4. Apply for and provide a certified magnetic detection report and non-dangerous goods appraisal document. Please note that extra service fees for oil draining, drying, and nitrogen sealing will be incurred, which dry-type transformers do not need, but this ensures your equipment arrives safely and rapidly.
A: The 0.0901 USD/W price point represents our S11 standard efficiency oil transformer, which offers a lower initial purchase cost, ideal for projects with strict upfront budget constraints. The 0.102 USD/W price reflects our S13 ultra-low loss model. While the unit price is higher by about 13.21%, it delivers a significantly lower long-term power consumption cost due to advanced core engineering. Both models strictly adopt full 99.99% pure copper winding, ensuring you receive maximum durability regardless of the efficiency tier chosen.
A: To guarantee immediate deployment and safe operation, every unit is fully equipped with a conservator tank (for oil expansion management), an explosion-proof pressure relief valve, a clear visual oil level indicator, a heavy-duty drain valve, a precise temperature thermometer, a grounding bolt, reinforced lifting lugs for crane positioning, an anti-theft oil plug, and a transport fixed support to prevent internal movement during rough overland transit.
A: Yes, absolutely. We adopt a thickened steel tank treated with an outdoor anti-corrosion coating that resists UV degradation and moisture. Furthermore, we utilize high-temperature resistant sealing rubber for all gaskets to avoid any risk of oil leakage under high temperatures all year round. The equipment is rated to withstand extreme environmental variables, meaning it can be installed directly outdoors on a concrete plinth without the need for a special, costly power distribution room.
A: We provide a comprehensive documentation package to ensure frictionless customs processing. This includes our ISO9001 certification, an IEC standard factory test report detailing the 100% full inspection results, CE certificate, fumigation certificate for the wooden packaging, commercial invoice, detailed packing list, magnetic inspection report (specifically for air shipment), and non-hazardous goods identification. We also support document guidance for your local clearance agents to prevent any port delays.
A: Every transformer is protected by a 3 years global full warranty. We supply a comprehensive English operation & maintenance manual that covers routine checks and troubleshooting. Beyond the warranty period, we guarantee a lifelong spare parts supply at direct factory cost. For complex infrastructural deployments, we can arrange technical engineers to travel to Zambia for on-site installation guidance, commissioning, and local staff training if required.quired.
