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Engineered specifically for demanding electrical environments, our 30kV epoxy resin cast dry-type transformers are developed for 30kV/0.4kV 50Hz power distribution systems. These robust units are widely used in Zambia large mining projects, centralized photovoltaic power stations, industrial heavy-load parks, urban high-voltage substations, underground power distribution rooms, tunnel power supply networks, and high-rise commercial buildings. Products fully comply with IEC 60076, GB 1094, and GB/T 10228 international and national standards, ensuring world-class reliability. Without insulating oil, it completely eliminates oil leakage, fire hazards, and explosion risks, and can be installed directly indoors, underground, and in densely populated areas without the need for expensive fire isolation facilities. Our factory produces the SC(B)10, SC(B)11, and SC(B)12 full series all-copper dry-type transformers, tailored to meet diverse project budgets. We operate with two unit price standards for customer selection: 0.0901 USD/W and 0.102 USD/W.
The 30kV high-voltage winding adopts a multi-layer thickened composite insulation structure, engineered so the lightning impulse withstand voltage reaches an impressive 170kV, providing a super large insulation safety margin for volatile electrical grids. It can effortlessly withstand long-term voltage surges, direct lightning strikes, and the frequent switching shocks characteristic of Zambia’s 30kV overhead mining power grid, effectively avoiding catastrophic insulation breakdown accidents caused by unstable grid voltage. The whole coil is integrally cast by a full vacuum pressure epoxy resin process, resulting in a solid, amber-like finish with absolutely no internal bubbles. This meticulous manufacturing guarantees a partial discharge of ≤5pC, maintaining highly stable insulation performance under long-term high voltage. Furthermore, the smooth, non-porous exterior offers strong resistance to abrasive dust, humid air, and surface creepage discharge.
To maximize electrical efficiency, the windings adopt high-conductivity 99.99% oxygen-free pure copper wire and copper foil. This dense, precision-wound configuration provides strong short-circuit impact resistance, exceptionally low temperature rise during peak loads, and a significantly extended service life. The iron core is meticulously manufactured from high-permeability, low-loss oriented silicon steel sheets utilizing a full miter lap cutting process, which significantly reduces no-load loss and dampens operating noise to a quiet, steady hum. We offer two price grades for optional selection to align with your specific capital expenditure and operational goals:
0.0901 USD/W: The standard SC(B)11 energy efficiency model. This configuration offers a low one-time purchase cost, making it highly suitable for short-cycle construction projects, temporary mining camps, or facilities where initial budget constraints are a primary consideration.
0.102 USD/W: The SC(B)12 ultra-low loss energy-saving model. This premium design focuses on greatly reducing long-term power consumption costs. It is perfectly applicable to energy-intensive mines and centralized photovoltaic power stations running 24 hours a day. While the unit price is about 13.21% higher than the standard model, the rapid return on investment through daily electricity savings makes it the superior choice for continuous operations.
Safety and environmental resilience are engineered into every layer of this unit. With no flammable insulating oil inside, the solid-state epoxy resin possesses an inherent self-extinguishing flame retardant property, ensuring no toxic gas emission during combustion in the extreme event of an external fire. Buyers can select an optional IP20 or IP23 metal protective enclosure, featuring heavy-duty steel construction and specialized anti-corrosion coatings. This provides excellent moisture-proof, dust-proof, and slight salt fog resistance, perfectly matching Zambia’s year-round high temperature and humid tropical environment. Because of its inherent fire safety, no fire separation pool is required for installation, which substantially saves on the civil construction investment of your power distribution room and accelerates project deployment.
Heavy industrial applications demand equipment that can handle unpredictable electrical stress. This transformer features an optional Class F or Class H high-temperature resistant insulation system. When equipped with our intelligent axial flow cooling fans, the system actively dissipates heat, allowing it to realize a 140% short-time overload operation without degrading the winding integrity. The optimized winding structure is specifically designed to resist severe harmonic interference generated by heavy mining equipment, variable frequency drives, and photovoltaic grid connections. Despite this rugged capability, it maintains an operating noise of ≤52dB at 1 meter, ensuring a safe auditory environment, with a service life extending up to more than 30 years. A standard intelligent temperature control system is integrated into the unit, supporting automated over-temperature alarms, overheat trip protection, and RS485 remote communication, realizing remote real-time monitoring of the transformer's operation status from a central control room.
Logistical efficiency is a major advantage of our dry-type architecture. Because the dry-type transformer does not contain any insulating oil, there is no need for oil drainage, hot air drying, nitrogen sealing, and other complicated, time-consuming pretreatment procedures strictly required by oil-immersed transformers before air transportation. For expedited freight, only a standard magnetic inspection report is needed, which greatly reduces pre-transport processing cost and cycle, ensuring your critical infrastructure projects stay on schedule. Once installed, daily maintenance is incredibly straightforward. It only needs regular visual inspections and basic dust cleaning using compressed air. There is absolutely no oil testing and no oil replacement work required, which is very suitable for remote mining areas in Zambia or isolated solar farms with insufficient specialized maintenance personnel on-site.
We recognize that every power grid has unique demands, offering fully customizable parameters: rated capacity, precise 30kV voltage tap range (±2×2.5% / ±5%), Dyn11/Yyn0 connection group, specific short-circuit impedance values, tailored protection enclosure grades, and mining special anti-surge reinforced coil structures. To assist your engineering teams, we provide complete product data sheets and CAD dimensional drawings for seamless facility planning. For international transit, we provide robust ISPM15 fumigation wooden case export packaging to prevent transit damage, and we directly arrange air/sea logistics to Zambia. We supply complete customs clearance documents including factory test reports, CE certificates, IEC certificates, magnetic inspection certificates, commercial invoices, and packing lists. Every unit is backed by a 3-year full machine warranty and a lifelong supply of spare parts at factory cost, equipped with comprehensive full English installation and operation manuals.
A: Yes, expedited air freight is fully supported. The whole machine has no insulating oil and does not belong to the dangerous goods category under international aviation regulations. Only a standard magnetic inspection report is required before shipment, without the tedious oil draining, hot air drying, and nitrogen sealing treatment required by traditional oil-immersed transformers. This significantly streamlines the logistics chain, which saves a lot of pre-shipment processing costs and drastically reduces transit time for urgent mining facility upgrades.
A: These two tiers address different project lifecycles. 0.0901 USD/W is the standard SC(B)11 model featuring a conventional loss value and a low initial purchase cost, ideal for projects with strict upfront budgets. 0.102 USD/W is the SC(B)12 ultra-low loss energy-saving model, which can save substantial long-term electricity costs for customers with continuous operation all year round. While the unit price is about 13.21% higher, the payback period is remarkably short due to energy conservation. Both models unequivocally adopt full 99.99% pure copper winding.
A: We ensure a frictionless import process by supplying a comprehensive documentation package. This includes the ISO9001 quality system certificate, CE certificate, complete IEC factory test report (verifying partial discharge ≤5pC), ISPM15 wood fumigation certificate, aviation magnetic inspection report, commercial invoice, packing list, and detailed certificate of origin. Our logistics team can provide professional document guidance and coordinate with your brokers for smooth, delay-free local customs clearance in Zambia.
A: Yes, the equipment is fully customizable to match regional grid characteristics. We can precisely adjust the high-voltage tap range (such as ±2×2.5% or ±5%), short-circuit impedance, overall insulation level, and integrate a mining special anti-surge reinforced coil structure according to local grid voltage fluctuation, high lightning frequency, and specific mining short-circuit risks. This bespoke engineering ensures flawless operation in highly unstable electrical environments.
A: We stand behind our manufacturing quality with a comprehensive 3 years global full machine warranty. To empower your local technicians, we provide complete English operation and maintenance manuals alongside detailed step-by-step installation videos. Should your project require it, we can arrange for our professional technical engineers to travel to Zambia for on-site installation supervision and commissioning guidance according to customer requirements, and we guarantee the lifelong supply of all necessary spare parts at direct factory cost.
