A power transformer is a static electrical device used to transfer electrical energy by means of electromagnetic induction. It can step up or step down voltage levels in alternating current (AC) power systems without changing the frequency, enabling efficient long-distance transmission and safe terminal use.
As the core equipment in power transmission and distribution networks, power transformers perform three key functions:
1.Isolating circuits to ensure operational safety;
2.Stabilizing voltage to avoid damage to terminal equipment;
3.Improving energy efficiency by reducing transmission losses.
They are essential for power plants, grid substations, industrial facilities, large commercial buildings and new energy projects (solar, wind, hydro), serving as the “bridge” between high-voltage transmission and low-voltage use.
| Configuration Feature | Oil Immersed Power Transformer | Dry Type Power Transformer | Amorphous Alloy Power Transformer |
| Insulation & Cooling Medium | Mineral Oil | Air / Epoxy Resin | Mineral Oil / Air (with non-crystalline core) |
| No-load Loss | Low (traditional) / Ultra-low (non-crystalline core) | Medium | Ultra-low (20-30% lower than traditional) |
| Fire Safety Rating | General (risk of oil combustion) | Excellent (non-combustible) | General / Excellent (dry type version) |
| Installation Environment | Outdoor / Indoor (large space) | Indoor / Small Space | Outdoor / Indoor |
| Maintenance Cost | Low (full-sealed model) | Very Low (no oil maintenance) | Low (ultra-low loss reduces maintenance) |
| Initial Cost | Low | High | Medium-High |
| Suitable Capacity Range | 10-2500kVA (large capacity) | 10-1500kVA (small-medium) | 10-2500kVA |
Buying Suggestion: Prioritize installation environment (indoor/outdoor) → fire safety requirements → long-term energy consumption → budget. Contact our engineers for free project-specific recommendations.
The core difference is insulation and cooling medium. Oil-immersed transformers use mineral oil (low cost, high efficiency, outdoor use), while dry-type transformers use epoxy resin (fire-safe, indoor use). Choose based on installation environment (indoor/outdoor), fire safety requirements, and budget. For outdoor large projects, oil-immersed is recommended; for indoor urban projects, dry-type is ideal.
Yes! We fully support customization for voltage ratio (e.g., 35kV/0.4kV, 110kV/10.5kV), capacity (10kVA–2500kVA+), cooling method, and compliance with local standards (IEC, IEEE, ANSI, DIN, GB, etc.). Our engineering team will design a compliant solution based on your requirements—just provide the target standard and project details when inquiring.
For standard models (35kV/110kV oil-immersed/dry-type), the delivery time is 30–45 working days. For customized models or 220kV large-capacity transformers, it’s 45–60 working days. Urgent orders (minimum 25 working days for standard models) are supported with priority production—contact us for details.
Yes! We offer a full range of after-sales services:
•Free technical documentation (installation manual, maintenance guide);
•24/7 online technical support (email, phone, WhatsApp);
•On-site installation and commissioning (service fees and travel expenses based on project location);
•Free operation and maintenance training for your team;
•2-year warranty (free replacement parts for manufacturing defects) + lifelong maintenance services.
All our products comply with international standards such as IEC 60076, IEEE C57.12.00, CSA C22.2 No. 66.1, and hold certifications including ISO 9001, CE, UL, and CB. We provide complete certification documents, test reports, and customs clearance materials to ensure smooth customs passage and project acceptance.
We accept flexible international payment terms:
•T/T (Telegraphic Transfer): 30% advance payment (start production) + 70% balance (before delivery against B/L copy);
•L/C (Letter of Credit): Irrevocable L/C at sight (for large orders);
•D/P (Documents against Payment): Available for regular clients;
•Western Union: For sample orders or small payments.
We can also discuss long-term cooperation terms for regular clients.
Yes! We provide sample transformers for testing (suitable for small-capacity models below 500kVA). The sample cost is the same as the bulk price, with a 30–40 working day delivery time. If you place a bulk order after sample approval, we will deduct the sample cost from the bulk order amount. The sample shipping cost is borne by the client.
We implement strict quality control throughout the production process:
1.Raw material inspection: All cores, windings, and accessories are sourced from certified suppliers (ABB, Siemens) and tested before production;
2.Process monitoring: Key processes (winding, core assembly, vacuum oil filling) are supervised by professional technicians;
3.Finished product testing: Each transformer undergoes no-load loss testing, short-circuit testing, insulation testing, and temperature rise testing, with a complete test report provided;
4.Factory inspection: Clients are welcome to visit the factory for pre-shipment inspection (we provide free pick-up and accommodation for large orders).
