Dry-type transformers is a static electrical device that uses air as the cooling medium and solid insulation materials (such as epoxy resin) to insulate the windings. It transfers electrical energy between circuits through electromagnetic induction, converting alternating current (AC) from one voltage level to another without changing the frequency.
As a core component in indoor power supply systems, dry-type transformers perform three key functions:
They are widely used in indoor and harsh-environment scenarios due to their superior safety, environmental friendliness and compact structure, making them indispensable for buildings, data centers and industrial facilities with high fire safety requirements.
| Configuration Feature | Epoxy Resin (AN) | Epoxy Resin (AF) | Cast Resin (AN) | Cast Resin (AF) |
| Insulation Principle | Epoxy resin coating | Epoxy resin coating | Vacuum-cast epoxy resin | Vacuum-cast epoxy resin |
| Capacity Range | 5kVA-500kVA | 250kVA-1000kVA | 50kVA-800kVA | 500kVA-2000kVA+ |
| Noise Level | ≤ 50dB | ≤ 60dB | ≤ 52dB | ≤ 62dB |
| Moisture Resistance | General | General | Excellent | Excellent |
| Maintenance Cost | Very Low | Low | Very Low | Low |
| Initial Cost | Low | Medium | Medium | High |
| Applicable Environment | Dry indoor | Dry indoor | Humid/dry indoor | Humid/dry indoor |
Buying Suggestion:
1.Determine insulation type based on environmental conditions (dry environment: epoxy resin; humid/corrosive environment: cast resin);
2.Select cooling method according to capacity and load (small capacity/low load: AN; large capacity/high load: AF);
3.Consider local standards and certification requirements (e.g., UL for North America, IEC for Europe);
4.Consult our engineers for free project-specific recommendations, including customized solutions for special scenarios.
Epoxy resin transformers have windings coated with epoxy resin – cost-effective, suitable for dry indoor environments (e.g., offices, commercial shops). Cast resin transformers have windings vacuum-cast with epoxy resin – excellent moisture resistance and corrosion resistance, suitable for humid, dusty or corrosive environments (e.g., data centers, industrial plants). We recommend epoxy resin for general dry scenarios; cast resin for harsh environments – our engineers can provide professional advice based on your project conditions.
Yes! We fully support customization for voltage level (10kV-110kV), capacity (5kVA-2000kVA+), insulation type (epoxy resin/cast resin), cooling method (AN/AF) and voltage ratio. We can also design products to comply with local standards, such as IEC (Europe), IEEE (North America), ANSI (USA), GB (China), DIN (Germany), etc. Just provide your project details and requirements when inquiring.
Delivery time: 20-35 working days for standard models (10kV/35kV, 5kVA-500kVA); 25-50 working days for large-capacity/high-voltage models (110kV, 800kVA+); 30-60 working days for customized models. Packaging: Sealed wooden cases with moisture-proof, shock-proof and dust-proof treatment. Transportation: By sea (for bulk orders) or by air (for urgent orders); we cooperate with professional logistics companies to ensure safe delivery, and provide complete shipping documents (bill of lading, commercial invoice, packing list, certification documents).
All our products comply with international standards such as IEC 60076, IEEE C57.12.00 and hold certifications including ISO 9001, CE, UL and CB. For fire safety, our transformers meet UL 2200 and IEC 61558 standards, which are widely recognized globally. We provide fire safety test reports and certification documents to ensure compliance with local inspection requirements. Our transformers have passed fire safety inspections in over 45 countries.
Dry-type transformers are basically maintenance-free, but regular inspections can extend their lifespan: 1) Clean the windings and 外壳 to remove dust and debris (especially for AF models, ensure fan air intake is unobstructed); 2) Check the cooling fans for normal operation and replace damaged fans in time; 3) Inspect the insulation surface for cracks or discoloration; 4) Measure insulation resistance regularly (recommended once a year). We provide a detailed maintenance guide with specific operation steps.
