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20kV oil-immersed distribution transformers are meticulously designed for 20kV/0.4kV 50Hz power distribution systems. When approaching these units, you can immediately perceive the heavy-duty metallic construction of the casing and hear the steady, quiet hum of stable electricity conversion. They are widely applied in Zambia mining zones, rural overhead power grids, industrial factories, centralized photovoltaic power stations and rural infrastructure construction projects. The products comply strictly with IEC 60076 and GB 1094 standards, while the core engineering is fully compatible with IEEE, ANSI, and NEMA international specifications, supported by SGS and CESI third-party certifications. Adopting premium mineral insulating oil for insulation and heat dissipation, these units deliver mature technology, low manufacturing cost, powerful overload capacity and stable high voltage performance. Our full series S11/S13/S15 all-copper winding transformers are available for customers seeking long-term grid reliability. Two unit price options are provided: 0.0901 USD/W and 0.102 USD/W for different project operation demands.
The high voltage winding adopts a multi-layer thickened insulating paper composite structure. By implementing advanced vacuum drying and vacuum oil filling processes alongside automated winding technology, internal moisture is thoroughly eliminated, significantly elevating insulation strength and structural stability. This provides enhanced lightning impulse withstand capacity, effectively resisting frequent lightning strikes, voltage surges and unstable voltage fluctuations of Zambia's 20kV overhead rural power grid. All coils are wound with 99.99% oxygen-free pure copper wire, featuring excellent electrical conductivity, outstanding short-circuit shock resistance and stable long-term operation under heavy mining harmonic loads.
The iron core is manufactured with high-permeability low-loss cold-rolled oriented silicon steel sheets and full miter lap cutting technology. This precise fabrication greatly reducing no-load loss and operating noise, maintaining strict acoustic control in sensitive environments. Two quotation standards for selection:
0.0901 USD/W: Standard S11 energy efficiency model, offering a low initial procurement cost, highly suitable for short-cycle construction projects requiring rapid deployment;
0.102 USD/W: S13 ultra-low loss high-efficiency model, delivering lower long-term power consumption. This is ideal for 24-hour continuous operation mines and photovoltaic power plants, with a unit price about 13.21% higher than standard version, yet providing substantial energy savings over its operational lifespan.
Insulating oil serves dual functions of insulation and heat dissipation, equipped with smooth, cool-to-touch corrugated radiators for natural cooling; external cooling fans are optional to support 120% short-time overload operation. For enhanced fire safety and ESG compliance, buyers can select high-ignition-point, biodegradable plant insulating oil (such as FR3). To facilitate modern grid management, the system offers optional DGA (Dissolved Gas Analysis) online monitoring, winding hotspot detectors, and RTU communication modules, seamlessly connecting to SCADA systems for predictive maintenance. Standard complete accessories: oil conservator, pressure relief valve, oil level indicator, drain valve, winding temperature sensor, grounding bolt, lifting lugs and anti-theft oil plug, fully matching Zambia outdoor installation conditions.
The transformer tank uses a thickened steel plate, processed by rigorous sandblasting, anti-rust primer and a textured outdoor weather-resistant topcoat, resisting year-round high temperature, high humidity and light salt fog in Zambia. The fully sealed corrugated tank design effectively isolates external oxygen and moisture. Paired with nitrogen seal protection, this achieves a design lifespan of up to 30 years, substantially lowering the Total Cost of Ownership (TCO). All sealing gaskets are high-temperature resistant rubber to avoid oil leakage under long-term outdoor running, and can be installed directly outdoors without dedicated distribution room.
Sea freight: Fill full insulating oil before delivery, packed with sturdy ISPM15 fumigation wooden cases that carry the distinct scent of treated timber, ensuring a low comprehensive logistics cost, fit for mass bulk orders;
Air freight: Mandatory pretreatment procedures: fully drain all insulating oil from tank, radiator and oil conservator; hot air drying to eliminate residual oil film on inner wall and coils; seal all openings and fill dry nitrogen for pressure maintenance. Magnetic inspection report and non-dangerous goods appraisal document are required for airline acceptance. Extra charges for oil draining, drying and nitrogen sealing will be generated, which dry-type transformers do not need.
We enforce strict quality control, executing 100% routine tests prior to dispatch—including partial discharge, lightning impulse, temperature rise, and sealing leak tests—and provide comprehensive FAT (Factory Acceptance Test) reports to guarantee zero-defect delivery. Customizable parameters: rated capacity, 20kV tap range (±2×2.5% / ±5%), Dyn11/Yyn0 connection group, short-circuit impedance, mining anti-surge reinforced structure, anti-theft design. Full set of customs clearance documents for Zambia: commercial invoice, packing list, fumigation certificate, factory type test report, magnetic inspection certificate (for air shipment), ISO9001 & CE certificates. 3-year full machine global warranty, lifelong spare parts supply at factory cost, equipped with full English installation & operation manual. We can arrange technical engineers to Zambia for on-site installation guidance upon request.
A: Yes, but a series of mandatory pretreatment is required to ensure aviation safety and equipment integrity:
1. Completely drain all insulating oil from tank, radiator and oil conservator;
2. Conduct hot air drying to remove residual oil film on coils and tank inner walls;
3. Block all ports and fill dry nitrogen for pressure sealing;
4. Apply magnetic inspection report and non-dangerous goods identification certificate. Additional fees for oil draining, drying and nitrogen sealing will be incurred, which dry-type transformers do not require.
A: 0.0901 USD/W is the S11 standard loss oil transformer, structured to provide a lower initial purchase cost for budget-conscious developments. 0.102 USD/W is the S13 ultra-low loss energy-saving model, intentionally designed for cutting long-term electricity expenditure, with a unit price about 13.21% higher. Both adopt full pure copper winding to guarantee superior conductivity.
A: To ensure comprehensive monitoring and physical protection, the unit includes an oil conservator, explosion-proof pressure relief valve, oil level gauge, drain valve, winding thermometer, grounding bolt, lifting lugs, anti-theft oil plug and transportation fixing supports.
A: Yes. A thickened steel tank and outdoor anti-corrosion coating are adopted, matched with high temperature resistant sealing rubber to prevent oil leakage under all-year high temperature, and can be installed outdoors without special power distribution room, saving civil construction expenses.
A: We supply a complete documentation package to prevent border delays: ISO9001 quality certificate, CE certificate, IEC full factory test report, fumigation certificate, commercial invoice, packing list, magnetic inspection report (for air freight), non-hazardous goods appraisal. We provide professional document guidance for local customs clearance.
A: We offer a 3-year global full machine warranty. We supply complete English operation & maintenance manuals, and provide spare parts at factory cost permanently. We can dispatch professional technical engineers to Zambia for on-site installation and commissioning guidance as required to ensure your infrastructure operates flawlessly.
