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Engineered specifically for demanding 20kV/0.4kV, 50Hz power distribution systems, our 20kV epoxy resin cast dry-type transformers deliver uncompromising reliability for critical infrastructure. These units are widely deployed across Zambia mining projects, large-scale photovoltaic power stations, industrial parks, urban high-voltage power grids, underground substations, hospitals, commercial complexes, and tunnel power supply projects. By eliminating insulating oil entirely, this design removes the inherent risks of oil leakage, fire, and explosion. The heavy-duty, cool-to-the-touch epoxy exterior allows for direct installation indoors, deep underground, and within densely populated public areas without requiring costly fire-rated isolation pools. Every unit fully complies with IEC 60076, GB 1094, and GB/T 10228 international and national standards, ensuring precise integration into global grids. We manufacture the complete series of SC(B)10, SC(B)11, and SC(B)12 high-efficiency dry-type transformers, exclusively utilizing pure copper windings for maximum conductivity. To accommodate different project budgets and long-term ROI goals, two unit price standards are available for selection: 0.0901 USD/W and 0.102 USD/W.
The 20kV high-voltage coil features a meticulously engineered multi-layer thickened composite insulation structure. During factory testing, this heavy-duty design proves its capability with a lightning impulse withstand voltage up to 150kV, significantly widening the insulation safety margin. This structural integrity allows the equipment to effortlessly handle severe voltage fluctuations, unpredictable lightning strikes, and the frequent switching surges commonly experienced in Zambia’s 20kV overhead power grid. The manufacturing process utilizes full vacuum pressure epoxy casting, creating a dense, glass-like solid structure with absolutely no internal bubbles. This precision casting guarantees a partial discharge of ≤5pC, ensuring exceptionally stable insulation performance during decades of continuous high-voltage operation. Furthermore, the smooth, non-porous resin surface provides strong resistance to dust accumulation and humid air breakdown, maintaining peak performance even in challenging tropical environments.
At the heart of our transformers lies a commitment to premium core materials. The windings are exclusively constructed from 99.99% high-conductivity oxygen-free pure copper wire and copper foil. This superior material choice ensures excellent short-circuit impact resistance, minimizes temperature rise during peak loads, and extends the overall service life. Complementing the copper windings, the iron core utilizes high-permeability, low-loss cold-rolled oriented silicon steel sheets. Assembled using an advanced step-lap full miter cutting process, this core drastically reduces no-load loss and minimizes running noise to a barely perceptible hum. To align with diverse total cost of ownership strategies, we offer two distinct price grades for customers to choose:
0.0901 USD/W: The standard energy efficiency SC(B)11 model. This option provides exceptional cost-effectiveness, making it the ideal choice for short-cycle construction projects where initial capital expenditure is a primary consideration.
0.102 USD/W: The ultra-low loss SC(B)12 high-efficiency model. Designed to lower long-term power consumption, this unit is perfectly suited for 24-hour continuous operation in demanding environments like mines and photovoltaic power stations. While the unit price is about 13.21% higher than the standard model, the accelerated return on investment through sustained energy savings is substantial.
Safety and environmental adaptability are engineered into every layer of this equipment. Containing absolutely no flammable insulating oil, the cast epoxy resin exhibits inherent self-extinguishing flame retardant characteristics. In the unlikely event of extreme external heat, it produces no toxic smoke or hazardous odors, safeguarding both personnel and property. Buyers can select an optional IP20/IP23 metal protective enclosure, which delivers excellent moisture-proof, dust-proof, and light anti-salt fog performance. This protective exterior perfectly adapts to Zambia's year-round high temperature and humid tropical environment, ensuring uninterrupted power flow even during heavy rainy seasons. Because the system is entirely oil-free, no fire isolation pool is required during installation. This critical design advantage significantly reduces the physical footprint of the equipment and saves substantial civil engineering investment for power distribution rooms, accelerating project deployment timelines.
Designed for resilience, these transformers offer an optional Class F/H high-temperature resistant insulation system. When equipped with our intelligent axial flow cooling fans, the unit can comfortably withstand 140% short-time overload operation, providing a crucial buffer during unexpected power spikes. The optimized winding structure is specifically engineered to resist severe harmonic interference generated by heavy mining equipment and complex photovoltaic grid connections. Despite its immense power handling, it operates with a remarkably low running noise of ≤52dB at 1 meter—equivalent to a quiet office environment—while boasting a service life that can reach more than 30 years. To facilitate modern facility management, each unit includes a standard intelligent temperature control system. This smart monitoring accessory supports over-temperature alarm functions, automated overheat trip protection, and RS485 remote communication, effortlessly realizing remote real-time monitoring of the transformer operating status for unmanned substations.
Logistical efficiency and ease of upkeep are paramount for international procurement. Because this dry-type transformer has no insulating oil, it entirely bypasses the complex procedures—such as oil draining, hot air drying, and nitrogen sealing—that are strictly required for oil-immersed transformers before air transportation. Consequently, only a standard magnetic inspection report needs to be provided to freight forwarders, which greatly reduces pre-transport processing costs and shortens the delivery cycle. Once installed, the total cost of ownership continues to drop. Daily maintenance only needs regular dust cleaning using basic compressed air or industrial vacuums. There is absolutely no oil testing, leak patching, or oil replacement work required. This "install and forget" reliability makes the equipment very suitable for Zambia remote areas, mining camps, and isolated solar farms with insufficient specialized maintenance personnel.
We recognize that every infrastructure project has unique technical demands. Therefore, we offer fully customizable parameters: rated capacity, 20kV voltage tap range (±2×2.5% / ±5%), Dyn11/Yyn0 connection group, short-circuit impedance, protection enclosure grade, and mining/photovoltaic special reinforced coil structures. To ensure pristine arrival, we provide reinforced ISPM15 fumigation wooden case export packaging and expertly arrange air/sea logistics directly to Zambia. Furthermore, we supply complete customs clearance documents including comprehensive factory test reports, CE, ISO9001, IEC certificates, magnetic inspection certificates, commercial invoices, and packing lists. Backed by a 3-year full machine warranty, lifelong cost price supply of spare parts, and detailed English installation and operation manuals, our export services provide absolute peace of mind. Our extensive application cases across overseas mining operations and data centers serve as a strong endorsement of our manufacturing excellence.
Yes, absolutely. Because the entire machine is cast in solid epoxy resin and contains absolutely no insulating oil, it does not classify as dangerous goods under international aviation regulations. Only a standard magnetic inspection is required before shipment. There is no need for the costly and time-consuming oil discharge, hot air drying, and nitrogen sealing treatments typical of oil-immersed transformers. This streamlined process saves a lot of pre-shipment processing fees and drastically reduces lead time, ensuring your project stays on schedule.
The 0.0901 USD/W option represents our standard SC(B)11 model, featuring a conventional loss value that offers a highly attractive low initial purchase cost for budget-conscious projects. Conversely, the 0.102 USD/W option is the SC(B)12 ultra-low loss energy-saving model. This premium unit is engineered to significantly save long-term electricity costs for customers running facilities with long-term continuous operation, such as data centers or mining sites. While the unit price of the high-efficiency model is about 13.21% higher upfront, the return on investment is rapid. Both models uncompromisingly adopt full pure copper windings.
We supply a comprehensive suite of documentation to ensure frictionless import. This includes the ISO9001 quality system certificate, CE certificate, a full set of IEC factory test reports detailing the ≤5pC partial discharge and 150kV impulse tests, an ISPM15 fumigation certificate for the wooden packaging, the crucial magnetic inspection report for air freight, along with the standard commercial invoice and packing list. Furthermore, our logistics team can provide professional document guidance specifically tailored for local customs clearance procedures in Zambia.
Fully customizable to your exact specifications. Our engineering team can precisely adjust the high-voltage tap range (±2×2.5% or ±5%), fine-tune the short-circuit impedance, elevate the insulation level, and reinforce the winding structure. These modifications are specifically designed according to the local 20kV grid voltage fluctuation patterns, high lightning frequency, and the severe mining short-circuit risk requirements unique to your operational environment, ensuring flawless compatibility.
Every transformer is backed by a comprehensive 3-year full machine global warranty. To support your local teams, we provide complete, easy-to-understand English operation and maintenance manuals alongside detailed installation videos. Should your project require hands-on expertise, we can arrange for our professional technical engineers to travel to Zambia for comprehensive on-site installation and commissioning guidance upon customer request. Additionally, all critical spare parts are reliably supplied at factory cost for the entire life of the equipment.
