Epoxy cast resin dry-type transformers stand out as a reliable, eco-friendly solution for modern power distribution systems, combining advanced material technology with optimized structural design. Below are their core characteristics, highlighting why they are widely favored across commercial, industrial, and public infrastructure projects:
Unlike traditional oil-immersed transformers, epoxy cast resin dry-type transformers operate entirely without insulating oil. This oil-free design eliminates the risk of oil leakage, spills, or contamination to soil, water, and the surrounding environment—aligning with global environmental protection standards. Moreover, the epoxy resin casting material boasts inherent flame-retardant and self-extinguishing properties: in the event of a fire hazard, it does not release toxic fumes or support combustion, effectively containing fire spread and ensuring the safety of personnel and equipment. Its fire-resistant capability makes it ideal for high-density areas such as high-rise buildings, shopping malls, and subway stations.
Equipped with Class F insulation, these transformers deliver exceptional thermal stability and durability. The epoxy resin casting forms a dense, moisture-proof insulation layer around the windings, enabling the transformer to withstand a maximum temperature rise of 100K during continuous operation. This high temperature rise tolerance means the transformer can operate reliably even under peak load conditions or in environments with moderate ambient temperature fluctuations, without compromising insulation performance or service life. The robust insulation system also enhances resistance to electrical breakdown, ensuring long-term operational safety.
Designed with energy conservation in mind, the SC(B)9 series of epoxy cast resin dry-type transformers achieves remarkable efficiency by optimizing core and winding structures. Its total loss (including no-load loss and load loss) is at least 10% lower than the requirements specified in the latest national standard GB/T10228. This reduced energy consumption translates to significant cost savings for users over the transformer’s lifecycle, while also reducing the overall carbon footprint of the power system—making it a sustainable choice for green energy projects.
Noise pollution is minimized through precise engineering of the core and winding assembly. The SC(B)9 series distribution transformers typically operate at noise levels below 50dB, which is comparable to the sound of a quiet office environment. This low-noise performance is achieved by using high-quality cold-rolled silicon steel sheets for the core (reducing magnetic vibration) and optimizing the winding clamping force (minimizing mechanical resonance). Such quiet operation makes the transformer suitable for noise-sensitive locations like hospitals, residential complexes, and data centers.
Partial discharge is a key factor affecting transformer reliability, and epoxy cast resin dry-type transformers excel in this regard. With a partial discharge magnitude usually kept below 10PC, the risk of insulation degradation caused by internal electrical discharge is drastically reduced. The epoxy resin casting also provides a hermetic seal that protects the windings from dust, moisture, and chemical corrosion. Combined with high-quality materials and strict manufacturing processes, these transformers offer exceptional reliability and a service life of up to 30 years, ensuring stable power supply with minimal downtime.
The epoxy resin casting material undergoes rigorous testing to ensure resistance to thermal shock and mechanical stress. It can withstand extreme temperature changes (from low to high ambient conditions) without cracking or deforming, maintaining structural integrity even in harsh environments. Additionally, the integrated cast structure enhances the transformer’s mechanical strength, giving it strong resistance to sudden short-circuit forces. During a short-circuit event, the windings and core remain stable, preventing internal damage and ensuring rapid recovery of power supply.
These transformers boast superior moisture-proof performance, capable of operating normally in environments with 100% relative humidity. Unlike oil-immersed transformers that require drying treatment after shutdown (especially in humid conditions), epoxy cast resin dry-type transformers can be restarted immediately without any pre-operation drying. This feature is particularly valuable for applications in coastal areas, basements, or other high-humidity locations, reducing maintenance time and ensuring quick response to power demands.
Thanks to the high insulation efficiency of epoxy resin and optimized structural layout, epoxy cast resin dry-type transformers are significantly smaller and lighter than traditional oil-immersed transformers. Statistics show that the overall dimensions of an epoxy cast resin dry-type transformer are less than half those of an oil-immersed transformer with the same capacity. Its lightweight design (typically 30-50% lighter than oil-immersed alternatives) simplifies transportation, handling, and installation—lowering logistics costs and reducing the need for heavy-duty lifting equipment.
The compact footprint and oil-free design eliminate the need for a dedicated transformer room, hanging core maintenance facilities, or load-bearing beams. This not only saves valuable land and building space but also reduces civil engineering costs: there’s no requirement for oil storage tanks, leak-proof pits, or fire-resistant partitions (mandatory for oil-immersed transformers). The transformer can be installed directly on the ground, walls, or racks, making it ideal for space-constrained projects such as urban high-rises, commercial complexes, and industrial workshops. Additionally, the absence of oil means no toxic gas emissions, ensuring compliance with environmental regulations and avoiding potential pollution liabilities.
Epoxy cast resin dry-type transformers are designed for hassle-free deployment. They come fully pre-assembled and tested from the factory, requiring no on-site debugging—simply position, connect, and commission. Unlike oil-immersed transformers that need regular oil sampling, testing, and replacement, these dry-type units have almost no maintenance requirements: there’s no oil to check, filter, or replace, and the sealed epoxy casting prevents dust accumulation on critical components. This translates to minimal operational and maintenance costs over the transformer’s lifetime, freeing up resources for other critical system upgrades.
To ensure safe and reliable operation, all epoxy cast resin dry-type transformers are equipped with a complete temperature protection control system. This system includes built-in temperature sensors (embedded in the windings) that continuously monitor real-time temperature changes. When the temperature exceeds preset thresholds, the system automatically triggers alarms, starts forced cooling fans, or even trips the power supply (in extreme cases) to prevent overheating. This proactive protection mechanism safeguards the transformer from thermal damage, extends its service life, and provides peace of mind for users.
