Engineered to handle extreme PWM switching transients, heavy harmonic loads, and severe tropical climates across Sri Lanka's renewable energy corridors.
Heavy-duty main step-down and grid tie power transformer featuring high-purity electrolytic copper windings, low loss CRGO steel cores, and ONAN cooling tailored for utility substations.
Flame-retardant, self-extinguishing epoxy resin cast dry-type transformer designed for indoor installations, sensitive environments, and extreme humidity without risk of fluid leakage.
Provides total electrical isolation between solar/wind inverter output and local grid lines. Built with high-grade electrostatic shielding to block high-frequency switching noise.
Energy-optimized dry-type transformer offering exceptionally low no-load losses, low partial discharge levels (<10 pC), and outstanding mechanical strength under thermal shock.
Compact step-down unit specifically engineered for industrial power distribution, auxiliary power systems in renewable stations, and continuous-duty data facilities.
Compliant with global IEC standards, delivering superior thermal dissipation and insulation integrity under volatile voltage variations and high humidity conditions.
Designed with multi-layered ground shielding to eliminate electrical transients, common-mode noise, and voltage spikes for sensitive control electronics and wind farm control hubs.
Versatile auxiliary power transformer optimized for localized voltage adaptation, control cabinet isolation, and sub-system distribution in renewable energy parks.
Standard grid distribution transformers fail prematurely when subjected to wind turbine inverter duty. Here is how advanced Chinese transformer engineering resolves these challenges.
Modern wind turbines utilize high-frequency Pulse-Width Modulation (PWM) full-scale converters. These generate severe non-sinusoidal currents and high Total Harmonic Distortion (THD). Our transformers are custom-designed with K-Factor ratings (K-13 to K-20), reinforced neutral conductors, and specialized core geometry to prevent excessive eddy current losses and localized hot-spot overheating.
To connect multiple wind turbine inverters to a single step-up transformer without cross-inverter interaction, we engineer dual-LV or triple-LV split-winding configurations (e.g., 690V / 690V to 33kV). Each LV winding is galvanically isolated and phase-shifted where required, effectively canceling out lower-order harmonics before power enters the collector network.
Fast switching IGBT inverters produce steep voltage rise times (high dv/dt), causing severe voltage stress on the primary turn insulation. Our wind duty transformers incorporate grounded copper electrostatic shields between the high-voltage and low-voltage windings, shunting capacitive high-frequency currents safely to earth and protecting the grid side from converter surges.
Wind generation experiences continuous power fluctuations and transient short-circuit currents during grid faults. Utilizing continuous copper or aluminum foil winding technology for low-voltage coils eliminates axial short-circuit forces, reduces hot-spot thermal gradients, and enhances mechanical withstand strength over a 30+ year operating lifecycle.
For liquid-immersed outdoor units, high-flashpoint synthetic ester fluids or premium inhibited mineral oils are utilized alongside Class 120 insulation systems. This allows the transformer to sustain continuous thermal overloads during peak wind velocity events without degrading the solid cellulosic insulation.
By employing top-tier grain-oriented silicon steel (CRGO) with step-lap miter joint stacking technology, our transformers minimize no-load losses (core losses) and excitation currents. This ensures maximum energy yield reaches the grid even during light breeze, low-generation periods.
Sri Lanka's ambitious drive toward 70% renewable energy by 2030 requires robust transformers tailored specifically to its distinct coastal, hill-country, and island operational environments.
The Mannar region hosts Sri Lanka's largest utility-scale wind projects (e.g., Thambapanni Wind Farm). Operating within a few hundred meters of the Indian Ocean exposes equipment to severe saline mist, high humidity, and airborne sand. Our supply solutions feature C5-M Heavy Marine anti-corrosion paint systems (compliant with ISO 12944), stainless steel hardware, hermetically sealed tanks, and high-creepage outdoor composite bushings rated for heavy salt pollution.
Characterized by intense monsoonal wind patterns and high ambient temperatures reaching 38°C, transformers in Kalpitiya require enhanced thermal design. Our inverter duty transformers implement ONAN/ONAF cooling with tropicalized radiators, solar radiation heat shields, and top-oil thermal margin design (50°C oil / 55°C winding temperature rise limits) to prevent thermal tripping during peak afternoon generation.
Navigating steep, narrow roads in the Central Province imposes severe transport dimensions and weight constraints. We design compact step-up transformers and modular cast resin dry-type units (SCB series) that offer high power density with reduced footprints, making them transportable on low-bed trailers and suitable for indoor/enclosed compact substations in high-altitude terrain.
Connecting wind power to the Ceylon Electricity Board (CEB) transmission network requires strict adherence to CEB Grid Code requirements, including IEEE 519 harmonic control and voltage unbalance tolerance. Our transformers feature on-load tap changers (OLTC) or off-circuit tap changers (OCTC) with wide tap ranges (e.g., ±2×2.5% or ±8×1.25%) to maintain stable 33kV terminal voltage despite weak grid feed lines.
Choosing between Oil-Immersed Inverter Duty Transformers and Cast Resin Dry-Type Transformers based on site environment, maintenance capability, and safety criteria.
| Feature / Parameter | Oil-Immersed Inverter Transformer | Cast Resin Dry-Type Transformer |
|---|---|---|
| Primary Application | Outdoor Nacelle-Base / Pad-Mounted Substations | Inside Turbine Tower Base / Compact Indoor Kiosk |
| Cooling Method | ONAN / ONAF (Mineral Oil / Synthetic Ester) | AN / AF (Natural / Forced Air Convection) |
| Corrosion Resistance | C5-M Epoxy Paint System on Steel Tank | Requires IP54 / IP55 Weatherproof Enclosure |
| Fire Safety Rating | K-Class Synthetic Ester (High Flashpoint >300°C) | F1 Self-Extinguishing, Zero Fire Hazard |
| Overload Capacity | High Thermal Mass; Handles Continuous Overloads | Moderate; Depends on Forced Air Fan Boost |
| Maintenance Needs | Periodic Oil DGA & Moisture Testing | Virtually Maintenance-Free (Dust Dusting Only) |
| Standard Compliance | IEC 60076-1, IS 2026, IEEE C57.12.00 | IEC 60076-11, DIN 42523, CE Mark |
Rooted in advanced engineering, strict ISO 9001/14001 quality frameworks, and end-to-end export capability.
From precision CNC CRGO steel core cutting to robotic tank welding and shot-blasting, all structural and magnetic components are manufactured within our 103,500+ sq. ft. facility under a single quality control plan.
Every single unit undergoes 100% routine testing before dispatch: Winding Resistance, Voltage Ratio & Vector Group, Insulation Resistance, Partial Discharge, and Load Loss testing. Lightning Impulse & Temperature Rise tests are certified via accredited third-party labs.
Our automated foil winding machines guarantee zero tension variations and precise edge-insulation alignment, eliminating hot-spot vulnerabilities and guaranteeing maximum short-circuit strength under network fault conditions.
Equipment exported to Sri Lanka (Colombo Port) is prepared with multi-layer vacuum barrier wrapping, desiccant packets, heavy-duty wooden crate framing, or nitrogen-filled shipping tanks to completely prevent moisture ingress during sea transit.
We fully support customer witness testing and international third-party inspections (such as SGS, TÜV, Bureau Veritas, or Intertek) at our test bay prior to issuing final dispatch clearance.
Every dispatch dossier includes detailed GA (General Arrangement) drawings, electrical schematics, Guaranteed Technical Particulars (GTP), routine test certificates, and complete O&M manuals tailored for local maintenance crews.
Answers to common commercial, technical, and logistical questions when importing wind power transformers into Sri Lanka.
Manufacturing standard distribution and dry-type transformers takes approximately 3 to 5 weeks following drawing approval. Custom wind power inverter duty transformers or high-capacity power transformers take 6 to 8 weeks. Ocean freight from main Chinese ports (Ningbo/Shanghai/Shenzhen) to Colombo Port typically takes 10 to 14 days.
Yes. Our engineering team designs customized transformers compliant with CEB technical specifications, IEC 60076 standards, and international grid interconnect codes. Guaranteed Technical Particulars (GTP) are provided during the bidding stage for CEB approval.
For high-salinity zones like Mannar and Kalpitiya, we apply ISO 12944 compliant C5-M high-durability epoxy coating systems with shot-blasted SA 2.5 surface preparation. External fittings, bolts, and hardware are constructed from 316 stainless steel or hot-dip galvanized steel.
Please share your project single-line diagram (SLD), rated capacity (kVA/MVA), primary and secondary voltage ratios (e.g., 33kV / 0.69kV), inverter switching frequency/harmonic profile, vector group (e.g., Dyn11, Dy11y11), tap changer preference, and site environmental conditions.
Absolutely. We specialize in dual-LV and triple-LV split-winding step-up transformers specifically designed to connect multiple wind turbine inverters simultaneously, providing physical phase isolation and blocking inter-inverter circulating currents.
All transformers come standard with a 12-month to 24-month operational warranty backed by technical support. We supply complete spare parts kits (bushings, gaskets, Buchholz relays, oil level gauges) and provide remote or on-site commissioning guidance through qualified technical personnel.
Consult with our senior transformer application engineers today. Send us your single-line diagram (SLD) or project specification sheet for a custom technical solution and factory-direct price quotation.
