Fully Sealed Three Phase Outdoor Energy-Saving Transformer

The Fully Sealed Three Phase Outdoor Energy-Saving Transformer is a next-generation distribution device meticulously designed to convert medium voltage electricity (such as 10kV or 35kV) into safe low-voltage power (400V/230V) for industrial, commercial, and residential applications. Unlike traditional transformers that require regular oil sampling and maintenance, this unit features a robust, hermetically sealed tank that completely isolates the insulating oil from the atmosphere. This design prevents oil oxidation and moisture ingress, the primary causes of insulation degradation and failure.

At its core, this transformer utilizes high-permeability cold-rolled grain-oriented silicon steel with an advanced stepped lap joint design. This technology minimizes magnetic hysteresis and eddy current losses, achieving no-load loss values that significantly exceed national energy-efficiency standards. The unit is optimized for outdoor installation, offering superior resistance to temperature extremes, dust, and humidity, making it the cornerstone of a modern, low-maintenance power distribution network.

Product Feature And Application

Key Features

Maintenance-Free Operation: The fully sealed corrugated tank eliminates the need for a conservator and breather, preventing oil aging and slashing maintenance costs.

Exceptional Energy Efficiency: Reduces no-load losses by up to 20% compared to standard S11 series transformers through an optimized core and high-conductivity copper windings.

Superior Overload Capacity: The oil-immersed cooling system (ONAN) ensures stable operation under sustained high loads and peak demand surges.

Robust Outdoor Durability: Built with weather-resistant coatings and IP54 protection, it withstands extreme temperatures (-25°C to +40°C), humidity, and UV exposure.

High Short-Circuit Withstand: Mechanically reinforced windings with a robust clamping system ensure safety and reliability during grid faults.

Main Application Scenarios

Urban & Rural Power Grids: Ideal for compact substations in residential communities, commercial centers, and rural electrification projects where reliable, low-maintenance equipment is essential. The Fully Sealed Three Phase Outdoor Energy-Saving Transformer excels in these environments.

Industrial Parks & Factories: Provides stable power for heavy machinery, processing lines, and manufacturing plants, handling variable loads with ease.

Renewable Energy Integration: Perfect for solar farms and wind power plants, where outdoor durability and high efficiency are critical for stepping up voltage for grid connection.

Infrastructure Projects: Deployed in airports, subway systems, data centers, and hospitals where power supply reliability is non-negotiable.

Temporary & Emergency Power: Its compact footprint and robust construction make it ideal for temporary substations or emergency repair sites.

Product Parameter (Specification)

Production Details

Core Material and Manufacturing Process

The core of this transformer is manufactured using high-permeability cold-rolled grain-oriented silicon steel. The laminations are precision-sheared and stacked using a 45° stepped lap joint process, ensuring a tightly integrated magnetic circuit. This technique minimizes eddy current losses and reduces magnetizing current, forming the foundation of its energy-saving capability. The core is secured with semi-dry glass tape to reduce vibration and ensure quiet operation.

Winding Structure

Both high-voltage and low-voltage windings are constructed from oxygen-free copper conductors, chosen for their high conductivity and low resistive losses. The low-voltage winding adopts a foil-wound configuration with longitudinal oil ducts, which not only enhances heat dissipation but also provides superior mechanical strength to withstand short-circuit forces.

Tank and Sealing Technology

The defining feature of this transformer is its fully sealed corrugated tank. Unlike conventional designs, the corrugated panels expand and contract to accommodate oil volume changes due to temperature fluctuations, eliminating the need for a traditional conservator. This creates a completely closed system, preventing the insulating oil from contacting external air, thereby eliminating oxidation, moisture absorption, and sludge formation. A pressure relief valve and a high-precision oil level gauge are standard safety features.

Insulation System

The Fully Sealed Three Phase Outdoor Energy-Saving Transformer utilizes high-quality mineral insulating oil that undergoes a rigorous vacuum drying and oil-filling process. This ensures that no residual air or moisture remains within the tank, providing a high partial discharge inception voltage and guaranteeing long-term dielectric reliability.

Quality Assurance & Certification

Certifications: ISO 9001:2008, CE, and comprehensive Type Test Reports from national transformer testing centers.

Routine Testing: Each unit undergoes 100% factory testing, including no-load loss, load loss, short-circuit impedance, induced over-voltage withstand, and partial discharge tests.

Quality Control: Our manufacturing process features real-time monitoring of core assembly, winding, and final assembly to ensure every transformer meets our stringent quality benchmarks.

Why Choose Lugao Power?

Choosing Lugao Power means investing in a product engineered for longevity. Our expertise in manufacturing the Fully Sealed Three Phase Outdoor Energy-Saving Transformer ensures you receive a unit that not only meets your electrical demands but also contributes to lower carbon emissions and reduced operating budgets.

After-Sales Service

5-Year Warranty: We guarantee a leak-free and paint-peel-free operation. Any manufacturing defect under normal use is covered for free repair or replacement.

Lifetime Service Support: Spare parts and technical assistance are available for the entire life of the transformer.

30-Year Service Life: Designed with high-grade materials to ensure three decades of reliable performance.

Rapid Response: In the event of equipment failure, our team responds within one hour of notification and dispatches technical personnel to the site within 24 hours domestically.

Packaging & Delivery

Packaging: The Fully Sealed Three Phase Outdoor Energy-Saving Transformer is securely packed in a weather-resistant wooden crate or wrapped for optimal protection during transport.

Shipping Condition: Delivered oil-filled with the tank fully sealed, accompanied by factory test reports, installation manuals, and detailed dimensional drawings.

Standard Accessories: Each unit includes an oil level gauge, pressure relief valve, dial thermometer, high-voltage and low-voltage bushings, grounding bolts, and a complete hardware set for installation.

Q&A: Frequently Asked Questions

Q1: What is a fully sealed three phase outdoor energy-saving transformer?

A1: It is a distribution transformer designed for outdoor use with a hermetically sealed tank. Unlike traditional units with an oil conservator, this design prevents the insulating oil from contacting the air, eliminating the risk of oxidation and moisture absorption, which significantly reduces maintenance and extends its lifespan.

Q2: How does this transformer save energy compared to older models?

A2: Energy savings are achieved through the use of high-permeability grain-oriented silicon steel and an optimized core joint structure. This reduces no-load (hysteresis and eddy current) losses by over 15-20% compared to conventional S9 or S11 series transformers, leading to substantial electricity bill reductions over the unit’s lifetime.

Q3: Is this transformer truly maintenance-free?

A3: Yes, under normal operating conditions. Because the Fully Sealed Three Phase Outdoor Energy-Saving Transformer uses a corrugated tank without a breather, the oil never degrades from exposure to air or moisture. This eliminates the need for periodic oil testing, filtering, or replacement that is required for conventional transformers.

Q4: Can this transformer handle short-circuit conditions safely?

A4: Absolutely. It is designed with mechanically reinforced windings using foil-wound low-voltage coils and a robust clamping system. All units are subjected to rigorous short-circuit impact tests during the type testing phase to ensure they can withstand grid faults without damage.