In the construction of photovoltaic power stations in the past, transformers were always the biggest headache. One option was oil-immersed transformers, which tend to leak oil in hot summers and require regular oil replacement, alongside inherent fire hazards that keep maintenance staff constantly on edge. The alternative was low-cost, low-quality dry-type transformers prone to overheating and tripping under heavy loads. This shuts down solar power generation, resulting in lost revenue. Clients often complain that “transformers are harder to manage than inverters”, while project managers struggle with bulky equipment, high noise levels and the need for separate protective enclosures. All these factors drive costs up significantly.
To tackle these pressing challenges, Hualai Electric has launched the 80 kVA SC11 dry-type transformer, eliminating the drawbacks of conventional solutions. Manufactured with vacuum-cast epoxy resin technology, the transformer rules out oil leakage common to oil-immersed transformers, removing concerns over oil contamination and open fire risks for data centres. Optimised core structure and coil heat dissipation paths are adopted to adapt to frequent load fluctuations in photovoltaic applications, keeping voltage fluctuation within ±2%. Stable operation is maintained whether rooftop solar panels reach peak output at midday or experience sharp power drops in the afternoon. Furthermore, its footprint is only two-thirds of comparable products, enabling direct installation inside photovoltaic prefabricated cabins and saving several square metres of floor space.
Just how reliable is this unit? Take a 5 MW distributed photovoltaic project in Northwest China as an example. The site previously deployed oil-immersed transformers, incurring annual expenses of over RMB 20,000 for oil replacement and fire protection upgrades. After retrofitting two Hualai Electric SC11 dry-type transformers, no overheating alarms have been triggered in three years. The cabinets remain nearly dust-free, with an IP23 protection rating that guarantees stable operation even in rainy and snowy weather. Most notably, the noise level is controlled below 45 decibels, making rooftop installation in residential areas neighbour-friendly.
Key Product Features (Three Core Highlights)
1. Superior fire resistance: Constructed with epoxy resin and flame-retardant fillers, the unit will not ignite or melt. Compliant with IEC 60076-11, it is ideal for installation inside photovoltaic prefabricated cabins.
2. Low power loss: High-permeability oriented silicon steel sheets are utilised. No-load loss is reduced by 15% compared with national standards, cutting electricity costs by approximately RMB 1,000 per year.
3. Strong overload resistance: Capable of continuous operation at 80% rated load for 8 hours. It reliably handles midday solar power peaks without unexpected breakdowns.
Practical Tips (Two Key Reminders)
① During installation, orient cooling fans towards the primary airflow direction. Select the 6% short-circuit impedance setting for optimal compatibility with photovoltaic inverters. ② Conduct annual thermal imaging inspections on cable connections. Do not wait until smoke appears for maintenance. Although dry-type transformers contain no oil, loose terminal connections can still cause overheating.
In short, the Hualai Electric SC11 80 kVA dry-type transformer stands out for excellent ease of use. Whether you operate photovoltaic power stations, industrial and mining facilities or commercial complexes, if you want to avoid oil leakage, excessive noise and overheating troubles, simply place the unit inside a photovoltaic prefabricated cabin, wire it up and commission it. A single unit can run for more than six years without routine maintenance, delivering outstanding cost-effectiveness.
