11kV Dry-Type Transformer

11kV epoxy resin cast dry-type transformers are designed for 11kV/0.4kV, 50Hz power distribution and transformation systems, widely applied in African urban power grids, mining enterprises, photovoltaic power stations, commercial complexes, residential communities, hospitals, airports, tunnels and indoor power distribution projects in Zambia and other regions. The products strictly comply with GB 1094 national standard for power transformers, IEC 60076 international standard for dry-type transformers and GB/T 10228 technical specification for dry-type transformers, featuring core advantages including oil-free fire resistance, ultra-low energy loss, maintenance-free operation, strong anti-humidity performance and eco-friendliness.

HY TRANSFORMER is a high-tech enterprise specializing in power transformers, capable of independent R&D, full-process production and global sales of full-series transformers of 220kV and below. Its 11kV dry-type product line covers SC(B)10, SC(B)11, SC(B)12 epoxy resin cast dry-type transformers and Class H non-sealed dry-type power transformers. The company also provides supporting YB European-style box-type substations and American prefabricated substations, delivering one-stop complete power distribution solutions for overseas infrastructure and photovoltaic projects.

1. Premium Raw Materials & Mature Vacuum Casting Technology

The iron core adopts high-permeability low-loss cold-rolled oriented silicon steel sheets with full miter joint structure, effectively cutting no-load loss and running noise. Windings are made of 99.9% oxygen-free pure copper wires/copper foil with excellent conductivity and short-circuit resistance. Coils are integrally formed via full vacuum pressure epoxy resin pouring, eliminating internal bubbles to realize ultra-low partial discharge (<5pC). Optional Class F/H high-temperature resistant insulation systems support long-term stable operation. After high-temperature curing, the integral sealed epoxy structure delivers outstanding moisture, dust and salt fog resistance, perfectly adapting to complex harsh environments in Africa such as high humidity, mining dust and photovoltaic harmonic interference.

The 11kV high-voltage winding adopts reinforced multi-layer insulation design with 95kV lightning impulse withstand capacity, featuring stronger insulation margin to resist frequent grid switching surges and lightning strikes in rural power grids.

2. Fire Safety, Zero Pollution, and Wide Environmental Adaptability

The unit contains no insulating oil, completely eliminating risks of oil leakage, fire, explosion and hazardous waste oil disposal. Epoxy resin is self-extinguishing and flame-retardant without releasing toxic fumes during combustion. It generates no pollutants during operation and can be directly installed in densely occupied indoor spaces including basements, shopping malls and medical buildings. Multiple protection grades IP20/IP23/IP30 are optional to resist moisture, dust and light salt fog, fully matching Zambia’s tropical humid climate. The reinforced epoxy insulation structure effectively prevents creepage discharge and surface tracking under high voltage.

3. High Efficiency & Low Loss with Long-Term Stable Operation

Magnetic circuits and winding structures are specially optimized for 11 kV overseas distribution networks, with no-load and load losses exceeding national Class 1 energy efficiency standards to lower long-term electricity operation costs. It features controllable temperature rise and low noise (≤50 dB at 1 meter), strong resistance to short-circuit shocks and power harmonics, enabling continuous stable operation under grid-connected photovoltaic and long-term heavy-load mining grid conditions. Equipped with intelligent temperature-controlled cooling fans, it can operate at 140% overload for a short period under forced air cooling, with a service life of over 30 years. The enlarged high-voltage insulation margin adapts to unstable voltage fluctuations of rural 11 kV power grids.

4. Modular Structure Supporting Full Customized Solutions

Adopting standardized modular design, the rated capacity, 11 kV high voltage tapping range (±5% / ±2×2.5%), connection symbol (Dyn11/Yyn0), impedance voltage, metal enclosure, and full intelligent temperature control system can all be customized on demand. Customized photovoltaic dedicated step-up dry-type transformers, rectifier dry-type transformers, and special isolation dry-type transformers are available to suit diverse scenarios, including African rural power grids, centralized photovoltaic power stations, factory workshops, and public building supporting facilities. For special 11 kV grid demands, we support customized higher short-circuit impedance and lightning protection reinforced coil structures.

5. Easy Installation & Maintenance with Lower Comprehensive Costs

The compact unit requires no oil sump or fire separation pool, and can be installed close to load centers to shorten cable layout and reduce line power loss. Daily maintenance only involves simple dust removal and visual inspection, with no periodic oil replacement or oil quality testing required, resulting in an ultra-low failure rate and greatly reduced after-operation expenses for African power stations. A complete intelligent temperature control system (over-temperature alarm, overheat trip protection, RS485 remote communication) is equipped to support remote real-time monitoring for intelligent power distribution rooms. No regular insulation oil testing is needed, which is especially suitable for areas with scarce maintenance personnel such as Zambia.

6. Stable Mass Supply & Complete Overseas After-sales Support

Equipped with large-scale professional production lines for 11kV dry-type transformers and abundant completed overseas engineering projects across Africa, we maintain sufficient production capacity to stably supply bulk orders of full-capacity 11kV distribution transformers and photovoltaic-special dry-type transformers. We provide on-site installation guidance, operation training, and lifetime after-sales technical support for overseas customers. We have rich delivery experience for 11 kV urban power grids, industrial parks, and centralized photovoltaic projects in Zambia, Tanzania, South Africa, and other African countries, with mature export packaging solutions for air/sea shipment.

Q1: Are you professional transformer manufacturer?

A: Yes, we are a professional dry-type & oil-immersed transformer manufacturer with over 20 years production experience, equipped with full automatic production workshops and complete high-voltage test lab. Our factory area covers 55,000 sqm with over 350 professional production & technical staff.

Q2: What services can you provide for 11kV dry transformers?

A: We provide one-stop service including customized design, sample test, mass production, export fumigation packaging, global logistics arrangement, on-site installation guidance and long-term after-sales technical support. We support air freight delivery without oil filling for African countries like Zambia.

Q3: How long is the product warranty period?

A: We provide 3 years full warranty for all 11kV dry-type transformers, and offer lifetime paid technical maintenance service.

Q4: Can we customize technical parameters?

A: Yes, full customization is available. We can adjust capacity, 11kV tap range, impedance voltage, connection group, protection enclosure grade, temperature control system and winding material (copper/aluminum) according to local grid standards of Zambia and other African markets. We can also design special transformers for photovoltaic, mining and rectifier use.

Q5: What certificates do your transformers have? Are they suitable for tropical humid African environment?

A: Our products pass ISO9001, CE, CB, CCC and IEC test certificates. IP23 enclosure is optional with good moisture, dust and anti-salt fog performance, fully applicable to Zambia tropical climate. We can provide third-party test reports, magnetic inspection certificate and non-dangerous goods identification document for air shipment.

Q6: Why choose our 11 kV dry-type transformers instead of other suppliers?

A: 1. We specialize in exporting transformers to Africa for over 10 years, with mature logistics and customs clearance experience for the Zambia market; 2. All coils adopt 99.9% pure copper winding with low loss and high overload capacity, cost-effective at unit USD/W price; 3. Full set of independent R&D team, flexible customized technical solutions to match local 11 kV grid conditions; 4. Strict multi-process quality inspection before delivery, stable mass supply, and complete after-sales support overseas; 5. Dry-type design without insulating oil; no dangerous goods restriction for air transportation after simple cleaning and drying.