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Engineered specifically for demanding medium-high voltage power distribution networks, our 33kV epoxy resin cast dry-type transformers serve as the reliable core for 33kV/0.4kV 50Hz systems. These units are extensively deployed across Zambia's large open-pit mines, centralized photovoltaic power stations, heavy industrial zones, urban high-voltage central substations, underground power distribution rooms, tunnel power supply networks, and high-rise commercial complex indoor power transformation projects. Every unit strictly complies with IEC 60076-11, GB 1094, and GB/T 10228 international and national standards, ensuring global safety and performance compliance. The fully oil-free design completely eliminates oil leakage, fire risks, and explosion hazards, allowing for safe installation indoors, underground, and in densely populated public areas without the need for expensive fire isolation pools. Our manufacturing facility produces the full series of SC(B)11/SC(B)12 high-efficiency all-copper dry-type transformers. To match the diverse long-term operation budgets of African mining and PV projects, we offer two distinct unit price standards for customer selection: 0.0901 USD/W and 0.102 USD/W. This flexibility ensures project developers can balance initial capital expenditure with long-term energy savings.
The 33kV high-voltage coil features a multi-layer thickened composite insulation structure, delivering exceptional resilience against grid instability. With a lightning impulse withstand voltage reaching up to 185kV and a power frequency withstand voltage of 70kV for 1 minute, this unit provides an ultra-large insulation safety margin. This robust configuration effectively resists the severe voltage fluctuations, frequent lightning strikes, and switching surges typical of Zambia’s 33kV overhead mining power grids, thereby preventing insulation breakdown and creepage discharge faults. Utilizing advanced Vacuum Pressure Integrated (VPI) and Cast Resin Technology (CRT), the entire coil is integrally molded through full vacuum pressure epoxy casting. This precise process results in a solid, glass-smooth finish with absolutely no internal bubbles, ensuring partial discharge remains ≤5pC. The resulting structure maintains highly stable insulation performance under long-term high voltage stress, offering formidable anti-dust and anti-humidity breakdown capabilities crucial for harsh operating conditions.
At the heart of the transformer, the windings utilize high-conductivity 99.99% oxygen-free copper wire and copper foil. This dense, heavy-duty material provides outstanding short-circuit impact resistance, maintains a low temperature rise during peak loads, and guarantees a service life extending over 30 years. The iron core is constructed from high-permeability, low-loss oriented silicon steel sheets, assembled using precision full miter lap cutting technology. This meticulous core construction significantly reduces no-load loss and minimizes operating noise, resulting in a quiet, steady hum during operation. We provide two distinct quotation grades to align with specific project financial models:
0.0901 USD/W: This represents our standard SC(B)11 energy efficiency model. It offers a lower initial purchase cost, making it an excellent choice for short-cycle temporary construction projects or facilities with strict upfront capital constraints.
0.102 USD/W: This is the SC(B)12 ultra-low loss energy-saving model. While the unit price is approximately 13.21% higher than the standard version, it significantly cuts long-term electricity consumption costs. This makes it the ideal investment for 24-hour uninterrupted mining operations and centralized photovoltaic power stations where lifecycle efficiency is paramount.
Safety and environmental sustainability are engineered into every component. Containing absolutely no flammable insulating oil, the unit eliminates the acrid smell of heated oil and the risk of hazardous leaks. The imported high-grade flame-retardant epoxy resin possesses inherent self-extinguishing performance, ensuring no toxic smoke is released during combustion. To combat harsh environments, an optional IP20/IP23 metal protective enclosure is available. This rugged casing provides excellent moisture-proof, dust-proof, and light anti-salt fog performance, perfectly coping with Zambia’s year-round high temperature and 100% high humidity tropical conditions. This compact, space-optimized design means no fire separation civil works or isolation pools are required during installation, substantially reducing the physical footprint and saving significant power distribution room construction investment.
Industrial applications demand exceptional thermal management. Buyers can select either a Class F (155℃) or Class H (180℃) high-temperature resistant insulation system. When equipped with intelligent axial flow cooling fans, the system supports a 140% short-time overload operation under forced air cooling (AF). You can hear the distinct, powerful rush of air as the fans engage, rapidly dissipating heat to safely support the massive starting currents of heavy mining equipment. The optimized winding structure effectively resists harmonic interference generated by mining crushers and photovoltaic inverters, while maintaining an exceptionally quiet operating noise of ≤54dB at 1 meter. Furthermore, smart monitoring and IoT integration are standard. The intelligent temperature control system supports over-temperature alarms, overheat trip protection, and RS485 remote communication, enabling facility managers to conduct remote real-time monitoring and predictive maintenance to prevent unexpected downtime.
Logistics and upkeep are radically simplified. Because the dry-type transformer contains no insulating oil, it bypasses the complicated pretreatment processes—such as oil draining, hot air drying, and nitrogen sealing—typically required by oil-immersed alternatives before air transportation. Only a standard magnetic inspection report is needed for airline acceptance, which greatly reduces pre-transport processing fees and shortens the delivery cycle. Once installed, daily maintenance is visually and physically straightforward. It only requires regular dust cleaning from the smooth, non-porous epoxy surfaces, completely eliminating messy oil testing and oil replacement routines. This low-maintenance profile is particularly advantageous for remote mining areas in Zambia where specialized maintenance personnel may be insufficient.
We offer comprehensive customization to meet precise grid specifications. Customizable technical parameters include rated capacity, a 33kV tap range of (±2×2.5% / ±5%), Dyn11/Yyn0 connection groups, specific short-circuit impedance values, protection enclosure grades, mining anti-surge reinforced coil structures, and optional on-load/off-circuit tap changers. For international transit, we provide ISPM15 fumigation wooden case export packaging and arrange reliable air/sea logistics directly to Zambia. We supply complete customs clearance documentation, including factory type test reports, CE and IEC certificates, magnetic inspection certificates, commercial invoices, and packing lists. Every unit is backed by a 3-year full machine global warranty and a lifelong supply of spare parts at factory cost, accompanied by comprehensive English installation and operation manuals. Upon request, we can dispatch professional technical engineers to Zambia for on-site installation and commissioning guidance.
A: Yes, air freight is entirely feasible and highly efficient. Because the whole machine operates without any insulating oil, it does not fall under dangerous goods classifications for aviation. Only a standard magnetic inspection report is required prior to shipment. This completely bypasses the costly and time-consuming pretreatment protocols—such as complete oil draining, extensive hot air drying, and complex nitrogen sealing—that are strictly required when transporting traditional oil-immersed transformers by air. This dry-type advantage saves a large amount of pre-shipment processing cost and significantly accelerates project timelines.
A: The difference lies in the core energy efficiency and long-term operational savings. The 0.0901 USD/W option is our standard SC(B)11 model, featuring conventional loss values and a lower initial purchase cost, making it suitable for standard applications. The 0.102 USD/W option is the SC(B)12 ultra-low loss energy-saving model. Although its unit price is about 13.21% higher, it drastically reduces core and copper losses. This model can save substantial long-term electricity costs for customers running operations with year-round continuous loads, such as centralized PV plants. Both models strictly adopt full pure copper windings for maximum durability.
A: We supply a comprehensive suite of documentation to ensure smooth and rapid border processing. This includes our ISO9001 quality system certificate, CE certificate, and the complete IEC factory type test report proving international compliance. For logistics, we provide the ISPM15 fumigation certificate for wooden packaging, the required magnetic inspection report for air freight, alongside the commercial invoice and detailed packing list. Our logistics team provides professional document guidance tailored specifically for local customs clearance procedures in Zambia.
A: Yes, the system is fully customizable to match specific regional grid behaviors. We can precisely adjust the high-voltage tap range, fine-tune the short-circuit impedance, elevate the insulation level, and implement a reinforced coil structure. These modifications are specifically engineered according to local grid voltage fluctuations, high lightning strike frequency, and the severe short-circuit risk requirements typical of heavy mining operations, ensuring absolute stability under stress.
A: Every unit is protected by a comprehensive 3 years global full machine warranty. To empower your local teams, we provide complete, easy-to-understand English operation and maintenance manuals along with detailed visual installation videos. Should your project require hands-on expertise, we can arrange for professional technical engineers to travel to Zambia for on-site installation and commissioning guidance according to customer requirements. Furthermore, we guarantee a lifelong supply of compatible spare parts provided strictly at factory cost.
