In modern urban power grid construction and industrial power distribution, safety and efficiency remain core demands. Epoxy resin dry-type transformers are gradually becoming the preferred power distribution equipment for high-rise buildings, data centers, renewable energy power stations, and large industrial and mining enterprises, thanks to their outstanding flame-retardant and explosion-proof performance, extremely low partial discharge, and excellent short-circuit withstand capability.
Core Technological Breakthroughs: Vacuum Casting and High-strength Insulation Structures
The superior performance of epoxy resin dry-type transformers stems from their precise manufacturing processes. The high- and low-voltage windings are typically wound using high-purity oxygen-free copper strips (foils) and cast and cured with epoxy resin under a vacuum. This process not only completely eliminates internal air bubbles to achieve extremely low partial discharge levels but also endows the coils with a high-strength fiberglass structure akin to reinforced concrete.
Exceptional Short-circuit Withstand Capability: Reinforced with fiberglass mesh on both the inner and outer surfaces of the coils, and with balanced ampere-turns between the high- and low-voltage windings, the transformer can withstand massive electrodynamic forces during sudden short circuits without sustaining damage.
Outstanding Temperature Resistance and Crack Prevention: Utilizing advanced “thin insulation” technology, the transformer can operate safely for extended periods at F-class (155°C) or H-class (180°C) temperatures, while effectively resisting insulation cracking caused by thermal cycling.
Superior Lightning Impulse Resistance: Foil windings feature low interlayer voltage and high capacitance, resulting in a nearly linear initial voltage distribution that significantly enhances the transformer’s ability to withstand lightning impulses.
Intelligent Temperature Control and High-load Operation
To adapt to complex power consumption environments, modern epoxy resin dry-type transformers are typically equipped with intelligent temperature display and control systems. Using PT100 platinum resistance sensors embedded within the low-voltage windings, the system monitors the temperature of each phase in real time, featuring functions such as over-temperature alarms, automatic tripping, and manual/automatic fan control.
In terms of heat dissipation, longitudinal ventilation ducts are designed inside the transformer. Paired with low-noise cross-flow fans, forced air cooling (AF) can be achieved. Under forced cooling conditions, the rated output capacity of the transformer can be increased by 40% to 50%, fully meeting the operational requirements for intermittent overloads or emergency accident overloads.
Furthermore, due to the enlarged copper foil area and increased resin fillers, the windings possess high thermal capacity, providing extremely strong short-term overload capabilities.
Green and Low-carbon Evolution
With the escalating global emphasis on energy conservation, emission reduction, and environmental protection, epoxy resin dry-type transformers are continuously evolving. On one hand, new-generation products (such as the SCB13 and SCB14 series) utilize higher-quality cold-rolled silicon steel sheets and advanced manufacturing processes to significantly reduce no-load losses and operating noise, complying with the latest national energy efficiency standards.
On the other hand, addressing the environmental challenge of disposing of traditional epoxy resin after retirement, the industry frontier has begun developing “degradable epoxy resin.” By introducing innovative technologies such as transesterification catalysts into the materials, the insulation can be efficiently degraded within a short period after the transformer’s retirement. The degraded products can then be reused to synthesize new epoxy resin. This breakthrough not only fills the technical gap in green disposal but also provides crucial support for building a zero-carbon, circular power system.
With its maintenance-free, moisture-resistant, flame-retardant, and self-extinguishing characteristics, the epoxy resin dry-type transformer perfectly aligns with the modern power distribution system’s stringent requirements for high reliability and safety.
Whether accommodating the high-proportion integration of renewable energy grids or ensuring stable power supply for critical facilities like hospitals and airports, it demonstrates irreplaceable value. When selecting power distribution equipment, enterprises should comprehensively evaluate both its technical performance and life-cycle benefits to lay a solid energy foundation for robust future development.
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