Air Cooling Outdoor Isolation Dry Type Transformer

This product is an outdoor-type, isolation-type, dry-type transformer utilizing air cooling (ANAN). It does not rely on any liquid medium for insulation or heat dissipation, but instead uses natural convection or forced air cooling to control temperature rise.

What does it do?

1. Electrical Isolation : Creates a physical electrical barrier between primary and secondary windings, effectively interrupting ground loops, suppressing harmonics, and filtering out high-frequency interference and surges from the grid, providing "clean" power to sensitive loads.

2. Voltage Transformation : Steps up or steps down AC voltage according to requirements, adapting to the power supply needs of various equipment.

3. Safety Protection : Through isolation design, prevents direct personnel contact with the high-voltage side, significantly reducing the risk of electric shock.

4. Outdoor Adaptation : A rugged enclosure designed for IP54 or higher protection ratings enables it to withstand wind, rain, dust, salt spray, and long-term UV exposure.

In short, when you need a safe, clean, maintenance-free power isolation and conversion solution in harsh outdoor environments, this Air Cooling Outdoor Isolation Dry Type Transformer is the core solution.

Product Advantages

Compared to traditional oil-immersed or standard indoor dry-type transformers, this product offers five core advantages:

1. Zero Pollution, Maintenance-Free : The oil-free design completely eliminates the risk of soil or water contamination from leaks, as well as the maintenance costs and downtime associated with annual oil testing and replacement. For outdoor projects under strict environmental regulations, this is a decisive advantage.

2. Superior Outdoor Environmental Tolerance : Utilizes Vacuum Pressure Impregnation (VPI) process and Class H (180°C) insulation system, combined with a fully sealed welded outdoor enclosure made of stainless steel or Aluzinc steel. Operates stably in ambient temperatures from -25°C to 50°C and relative humidity up to 95%. Resistant to salt spray, fungus, and corrosion.

3. Ultimate Safety with Electrical Isolation : Reinforced insulation between primary and secondary windings achieves a dielectric withstand voltage of 3kV to 5kV (depending on model). Effectively isolates DC components, third harmonics, and various surge impacts from the grid, protecting downstream precision instruments.

4. Natural Air Cooling, Quiet and Reliable : Relies on air convection for heat dissipation without fans (optional). Operating noise is significantly lower than oil-immersed transformers. With no rotating mechanical parts in the core components, Mean Time Between Failures (MTBF) is significantly improved.

5. High Overload Capacity, Usable in Emergencies : Emergency overload capacity up to 120% for continuous operation, 150% for short-term operation. During unexpected outdoor load peaks (e.g., multiple motors starting simultaneously), no immediate capacity increase is needed, buying valuable time for the user.

Product Features

Core : High-permeability cold-rolled grain-oriented silicon steel, step-lap joint process, significantly reduced no-load loss and exciting current.

Windings : Both high and low voltage windings use all-copper (aluminum optional) conductors, wrapped with Nomex® or similar aramid insulation paper, processed via VPI vacuum impregnation with solventless varnish, forming a robust, moisture-resistant, high-temperature tolerant solid insulation structure.

Isolation Structure : Primary and secondary windings are wound on separate bobbins or independent core legs, with an optional electrostatic shield between them, minimizing coupling capacitance and providing excellent high-frequency interference suppression.

Protective Enclosure : Standard IP54 protection (dust-tight, splash-proof), IP65 optional. Enclosure made of 2.0mm thick stainless steel or Galvalume steel, featuring a rainproof roof, stainless steel ventilated louvers, and anti-pry locks.

Temperature Control System : Built-in PTC or PT100 RTD temperature sensors, connectable to a smart temperature controller for over-temperature alarm, trip protection, and automatic fan activation (if optional fans are installed).

Terminals : Outdoor high-voltage junction box with silicone rubber seals and cable gland entries. Low-voltage side uses tin-plated copper busbars or waterproof connectors.

Product Application

This Air Cooling Outdoor Isolation Dry Type Transformer is widely used in the following scenarios:

Renewable Energy Generation : Isolation on the low-voltage side of PV power plant and wind farm skid-mounted substations, isolating the inverter output voltage before grid connection or local power supply.

Outdoor Industrial Equipment : Power supply isolation for oil drilling platforms, open-pit mine crushers, port shore power systems, tunnel boring machines (shield machines), preventing grid surges from damaging equipment.

Temporary & Emergency Power : Generator output isolation for outdoor events, sports competitions, and disaster relief sites, providing clean power for audio, video, and control equipment.

Charging Infrastructure : Input isolation transformer for outdoor DC fast chargers, preventing harmonic feedback into the grid while protecting the charging modules.

Smart Grid & Distribution : Station service or isolation transformers within outdoor ring main units and compact substations, providing safe, reliable power for automation terminals (DTU/FTU).

Production Details

VPI Vacuum Pressure Impregnation Process

All windings are impregnated with solventless insulating varnish under vacuum, removing internal air and allowing the varnish to fully penetrate between turns, layers, and to ground. After curing, it forms a monolithic "solid" structure with thermal conductivity, mechanical strength, and moisture resistance far exceeding standard impregnation processes.

Outdoor-Specific Junction Box

The low-voltage outlet box features a flame-retardant insulating support panel, with ample electrical clearance (>20mm) between copper busbars. Cable entries utilize multi-seal gaskets and cable glands, compatible with various armored or rubber-sheathed cables, preventing moisture ingress along the cable into the box.

Heavy-Duty Stainless Steel Enclosure

The enclosure is manufactured using laser cutting, CNC bending, and robotic welding, with all seams continuously sealed. Doors feature three-point locking handles and weather-resistant sealing gaskets. The top cover is designed as an angled rain shield and includes lifting eye bolts for convenient outdoor hoisting.

Packaging, Delivery & After-Sales

Packaging Method

1. Transformer body wrapped with moisture-proof PE film, desiccant placed inside.

2. Packed in heavy-duty wooden crates or fumigation-free plywood boxes (meeting export standards), surrounded by high-density foam or air-filled bags for cushioning.

3. Labels such as "Moisture Proof", "Fragile", and "This Way Up" affixed to the outside of the box.

Delivery Method

1. Domestic: Dedicated logistics truck (small capacities can be shipped via Deppon/SF Express heavy goods).

2. Export: Arrangements for sea, rail, or air freight, including customs documentation.

After-Sales Service

1. Warranty Period: 12 months from date of receipt.

2. Free repair or replacement for manufacturing defects during the warranty period.

Frequently Asked Questions (Q&A)

Q1: Isn't this Air Cooling Outdoor Isolation Dry Type Transformer more prone to overheating and burning out compared to a regular oil-immersed transformer?

A: Quite the opposite. Although air has a lower thermal conductivity than oil, our product uses Class H insulation (rated for 180°C) and the VPI vacuum impregnation process. Heat from the windings is efficiently conducted away and dissipated through the enclosure. For the same capacity, our design has a larger temperature rise margin, making it less likely to suffer the burnout failures caused by oil leakage and subsequent low oil levels in traditional units. Our Air Cooling Outdoor Isolation Dry Type Transformer operates with hot spot temperatures well below the insulation limit even at full load in 40°C outdoor conditions.

Q2: On rainy days outdoors, won't rainwater enter through the cooling louvers and cause a short circuit inside?

A: No. Our enclosure protection rating is IP54. The louvers feature an internal labyrinth-style channel and metal mesh screen. Tests show that even with direct spray from the front at a rainfall intensity of 10mm per minute, the interior remains completely dry. All cable entry ports use explosion-grade sealed glands, completely blocking any path for moisture ingress.

Technical Specification Table