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Our 35kV dry-type transformers feature capacities ranging from 30kVA to 5000kVA. Utilizing epoxy resin casting, the SCB13 series is currently one of the most widely used energy-saving products for 35kV voltage grades. They ensure high safety, excellent environmental adaptability, and full compliance with the latest efficiency standards.
Core Parameters:
• Voltage Ratings: 35kV / 0.4kV (Customizable)
• Insulation Class: Class F (155℃) or Class H (180℃)
• Cooling Method: AN / AF
Product Features
Constructed with epoxy resin casting, making it flame retardant and self-extinguishing. Available with IP20 protection to prevent accidental contact with live parts.
Features AN/AF cooling modes. When equipped with forced air cooling (AF), the transformer's capacity can be increased by 50% during heavy loads.
The standard Dyn11 vector group offers strong anti-harmonic capabilities and minimal zero-sequence impedance, perfect for modern grids.
Fully complies with the latest GB/T 10228-2023 standards. Optional SCB14/SCB18 versions are available for even lower energy losses.
Core Technical Specifications
Parameter | Technical Indicators | Remarks |
| Product Model | SCB13-30~5000kVA/35 | "S" Three-phase, "C" Epoxy cast, "B" Foil coil |
| Rated Frequency | 50 Hz | Standard frequency |
| Voltage Combination | HV: 35kV / 38.5kV LV: 0.4kV | LV customizable to 3.15kV, 6.3kV, 10.5kV |
| Tapping Range | ±5% or ±2×2.5% | Off-circuit tap changing |
| Vector Group | Dyn11 or Yyn0 | Dyn11 provides strong anti-harmonic performance |
| Insulation Class | Class F (155℃) or Class H (180℃) | Epoxy resin cast, flame retardant |
| Temp. Rise Limits | Winding: 100K (Class F) / 125K (Class H) | Dry-type specific |
| Short-Circuit Impedance | 4.0% - 8.0% | Impedance generally increases with capacity |
| Protection Grade | IP00 / IP20 / IP23 | IP20 prevents solid objects >12mm |
Full Series Parameters (SCB13-35kV)
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Capacity (kVA) | No-Load Loss (W) | Load Loss (W) | No-Load Current (%) | Impedance (%) | Ref. Weight (kg) |
| 30 | 260 | 1,040 | 2.0 | 4.0 | ~350 |
| 50 | 360 | 1,450 | 1.8 | 4.0 | ~450 |
| 80 | 500 | 2,050 | 1.6 | 4.0 | ~550 |
| 100 | 580 | 2,400 | 1.5 | 4.0 | ~650 |
| 125 | 670 | 2,850 | 1.4 | 4.0 | ~750 |
| 160 | 800 | 3,400 | 1.3 | 4.0 | ~900 |
| 200 | 940 | 4,000 | 1.2 | 4.0 | ~1,050 |
| 250 | 1,100 | 4,750 | 1.1 | 4.0 | ~1,250 |
| 315 | 1,300 | 5,700 | 1.0 | 6.0 | ~1,500 |
| 400 | 1,550 | 6,900 | 0.9 | 6.0 | ~1,800 |
| 500 | 1,800 | 8,200 | 0.8 | 6.0 | ~2,100 |
| 630 | 2,150 | 9,900 | 0.7 | 6.0 | ~2,500 |
| 800 | 2,600 | 12,000 | 0.6 | 6.0 | ~3,000 |
| 1000 | 3,100 | 14,500 | 0.5 | 6.0 | ~3,600 |
| 1250 | 3,700 | 17,500 | 0.5 | 7.0 | ~4,300 |
| 1600 | 4,500 | 21,500 | 0.4 | 7.0 | ~5,200 |
| 2000 | 5,400 | 25,800 | 0.4 | 7.0 | ~6,300 |
| 2500 | 6,500 | 31,000 | 0.3 | 7.0 | ~7,500 |
| 3150 | 7,800 | 37,500 | 0.3 | 8.0 | ~9,000 |
| 4000 | 9,500 | 46,000 | 0.25 | 8.0 | ~11,000 |
| 5000 | 11,500 | 55,500 | 0.2 | 8.0 | ~13,500 |
| Note: Loss values are approximate. For new projects, we recommend SCB14 or SCB18 series which offer even lower losses compliant with GB/T 10228-2023. | |||||
FAQ & Selection Guide
For standard operations, AN (Natural Air Cooling) is recommended as it operates silently without fans and requires minimal maintenance. If you anticipate load spikes, choose AN/AF (Forced Air Cooling). When temperatures rise or the load exceeds rated capacity, the fans activate, allowing for a short-term 50% capacity overload.
35kV dry-type transformers are primarily designed for indoor use. If outdoor installation is necessary, the unit MUST be equipped with a protective enclosure rated IP54 or higher. This enclosure will protect the transformer from UV radiation and rain, while also providing necessary ventilation and heat dissipation.
This dry type transformer adopts epoxy resin casting insulation. It has no oil leakage risk, low fire hazard and compact structure. It features low partial discharge, strong short-circuit resistance and low noise. It can be installed indoors or in crowded areas, requiring little daily maintenance and meeting strict environmental protection requirements for power distribution projects.
The transformer’s insulation class is F or H optional, with the allowable winding temperature rise designed accordingly. It can withstand short-time overload under specified ambient conditions. Continuous overload is not recommended. We provide temperature monitoring system to track winding temperature in real time and protect the unit from overheating damage.
Yes. The epoxy resin encapsulated windings are well sealed against moisture and dust. We can equip IP20 or IP30 protective enclosures as options. However, long-term exposure to corrosive gas or heavy salt spray needs extra anti-corrosion treatment. Regular surface cleaning is still suggested to maintain stable operation.
Every transformer will complete a full set of factory tests, including winding resistance measurement, voltage ratio check, partial discharge test, induced voltage test and no-load/load loss test. All test data complies with IEC and GB standards. We will attach complete test reports, drawings and operation manuals together with the shipment.
Whatsapp: +86-13961294414
E-mail: junqiu.wang@czguanghui.cn
jocelyn.duan@czguanghui.cn
ADD: No. 1, Yulong Middle Road, Xuejia Town, Xinbei District, Changzhou City, China
Mobile: 0086-15380068868
