Grid Solutions

Your Leading Grid Solutions Supplier

LTEC provides you with automation, digital grid solutions, including reactors, capacitors, filters, transformers, and more. The solutions may improve grid reliability and security with power generation, transmission & distribution products. We also offer dedicated smart grid solutions that have proven to be a highly reliable and cost-effective way of managing the grid's power usage.

Why choose us?

Our factory

Our primary production plant in Kunshan City spans an area of 20,000 square meters, situated one hour's drive away from Shanghai Airport (PVG). We have about 120 patents related to our products.

Sales market

Our products have been exported to the United States, Germany, the United Kingdom, Israel, Australia, and more than 60 countries and regions around the world.

Custom service

We provide our customers with world-class LV and HV products, along with reliable technology and friendly, flexible customer support. Additionally, we develop "tailor-made" products and solutions tailored to your applications.

Our certificate

We deliver top-quality products that meet international standards such as UL, TUV, CE, EAC, and GOST. Our commitment to excellence is supported by our ISO9001 certification for quality management.

Types of Dry Type Distribution Transformers

There are two main variants of Dry-Type Distribution Transformer: Cast Resin Transformer and Vacuum Pressure Impregnated Transformer.

The primary and secondary windings in a Cast Resin Transformer are insulated in epoxy resin, which makes it perfect for areas that have high humidity or moisture. It can take heavy power loads in comparison to other transformers and does not lead to short circuits. They are particularly useful when the transformer needs to be fitted outside without the worry of rain or the sun. It usually comes in ratings of 25 KVA to 12,500 KVA.

The windings in the Vacuum Pressure Impregnated Transformer are made in foils, discs, or strips so it can easily regulate the voltage to suit the devices connected. It works perfectly in moisture-prone areas. This transformer comes in a rating of 5KVA to 30MVA.

Advantages Of A Dry-Type Distribution Transformer

Higher safety standards
The priority in power distribution is safety, and dry-type distribution transformers have proved excellent in this. The fire hazard is well below the acceptable limit in these transformers since they use no oil.

Low maintenance requirements
One major advantage of dry-type distribution transformers is that they require very little maintenance. Oil-filled transformers are prone to leakage and contamination because of the oil. The sealed design of these transformers prevents dust and moisture from entering, thereby increasing their operational life.

Environment-friendly operation

Dry-type transformers are one of the environmentally friendly alternatives to oil-filled transformers. Their air-cooled design does not require oil and hence does not pose any danger of soil and water contamination. Also, they make very little noise and follow the strictest environmental regulations.

Versatility in applications

Whether you need a transformer for indoor usage or tough outdoor conditions, dry-type transformers have an unmatched level of flexibility. Their rugged structure enables them to withstand some harsh weather conditions, making them suitable for outdoor dry-type transformer installations. They are compact and lightweight, making them easy to install in cramped spaces.

Longevity and durability

Long-term value is created with an investment in a dry-type transformer. Since it is constructed for harsh conditions, such as high humidity and temperature changes, the dry-type transformer will experience minimal wear and tear because of its construction, and its lifespan will be extended.

Product Parameters

Category	Parameter	Specification
Basic Ratings	Rated Capacity	Up to 10 MVA
	Rated Primary Voltage	3kV-13.8 kV (±10% tolerance)
	Rated Secondary Voltage	120V-480V
	Frequency	50Hz/60Hz
Performance	Efficiency	>95%
	Tap Range	±5% or 2×2.5%
Construction	Design Type	Three-phase, dry-type iron core, open type
	Winding Material	Copper/Aluminum
	Terminal Type	Copper bus bars
	Insulation Structure	VPI (Vacuum Pressure Impregnated)
Cooling & Thermal	Cooling Method	Natural air-cooled (AN) with effective cooling design
	Insulation Class	H (180°C) standard, C class optional, R (220°C) certified
	Insulation System	UL1446 compliant
Protection	Protection Class	IP00 (indoor mounting)
	Fire Resistance	Fire-resistant materials
Environmental	Maximum Elevation	≤1000m above sea level
	Maximum Humidity	95% (non-condensing)
Certifications	Temperature Class Certified	Class H (180°C) & Class R (220°C)

Advantages of Dry-Type Rectifier Transformers

Excellent fire-resistant performance
Dry-type rectifier transformers use fire-resistant and self-extinguishing solid insulation materials, such as epoxy resin. Unlike oil-immersed transformers, they do not release toxic gases or cause explosions during emergencies like fires. This makes them ideal for high-fire-risk areas like hospitals, schools, and office buildings, ensuring the safety of electrical systems in crowded environments.

Elimination of oil pollution risks
By abandoning insulating oil, dry-type rectifier transformers eliminate the risk of oil leakage. This not only prevents environmental pollution of soil and water sources but also reduces equipment failures and maintenance costs, enhancing operational stability and reliability.

No environmental pollution
Lacking insulating oil, dry-type rectifier transformers do not pollute the environment throughout their lifecycle. There is no oil discharge during production, operation, or disposal, aligning with green development concepts and contributing to environmental protection.

Efficient operation with low energy consumption
Optimized design and advanced manufacturing technologies enable dry-type rectifier transformers to achieve lower operational losses and reduce energy waste. Their efficient energy transfer mechanisms improve energy utilization efficiency, helping businesses cut electricity costs and achieve sustainability goals.

Low maintenance costs
Dry-type rectifier transformers require no regular insulating oil replacement, significantly reducing maintenance workload and costs. Their simple structure and high reliability result in fewer failures, further lowering maintenance frequency and expenses, making them more economical for users.

Stable electrical performance
Without insulating oil, the electrical performance of dry-type rectifier transformers is less affected by environmental factors and less prone to degradation. They maintain a stable working state even with continuous long-term operation, ensuring a reliable power supply and extending equipment lifespan.

Strong short-circuit resistance
These transformers have robust mechanical strength and excellent short-circuit resistance. They can quickly respond to and withstand short-circuit current impacts, protecting the equipment from severe damage, extending service life, and reducing replacement frequency.

Compact and lightweight design
The small size and light weight of dry-type rectifier transformers make installation more flexible and convenient. They do not require a special foundation and can be easily installed in various complex locations, such as high-rise buildings, subway systems, and chemical plants, accommodating diverse spatial needs.

Strong environmental adaptability
These transformers can operate stably in high humidity and harsh environments. Users can also configure enclosures or leave them uncovered based on the actual environment, enhancing the equipment's versatility and applicability.

Application Fields of Dry-Type Rectifier Transformers

Power system

In the traditional power distribution transformer system of the transmission and distribution station, the dry-type rectifier transformer can accurately adjust the voltage and current to ensure the stability and reliability of the power supply. In the field of new energy power generation, such as wind power and solar power generation systems, dry-type rectifier transformers also play an indispensable role, helping the efficient conversion and stable transmission of clean energy.

Industrial field

In industrial industries such as steel, cement, petrochemicals, and papermaking, dry-type rectifier transformers provide stable DC power for various equipment and machines, and are key equipment to ensure the continuous operation of the production line. Taking high-voltage inverters as an example, phase-shifting rectifier dry-type transformers, as an important component, can provide them with multi-phase rectifier power to meet the complex power needs in industrial production.

Transportation field

In the railway transportation system, dry-type rectifier transformers provide stable DC power for electric locomotives, signal lights, and other equipment to ensure the safety and efficiency of railway transportation. In urban rail transit systems such as subways and light rails, rectifier transformers, as the main equipment of the traction power supply system, support the normal operation and dispatching of trains.

Building and commercial fields

In data centers, server rooms, and other places with extremely high requirements for power stability, dry-type rectifier transformers can provide stable DC power to ensure the normal operation of IT equipment and avoid data loss and equipment damage caused by power fluctuations.

Product Parameters

Category	Parameter	Specification
General	Power Rating	Up to 10 MVA
	Construction	VP1 Structure
Cooling & Insulation	Cooling Method	AN / AF (IEC 60076-11 compliant)
	Insulation System	UL 1446 certified, Class H (180°C) or R (220°C)
	Fire Resistance	Self-extinguishing, flame-retardant materials
Electrical	Frequency	50/60Hz (±5%)
	Standards Compliance	IEC 61378-1, IEEE C57.18.10
Environmental	Ambient Temperature Range	-25°C to +50°C
	Altitude	≤3000m (derating above 1000m)
Design Features	Efficiency	High-efficiency cooling design
	Safety	No flammable liquids, suitable for hazardous environments

Terms and conditions

Shipping term: FOB SHANGHAI
Delivery time: 4-6 weeks after we receive your payment.
Payment term: The advance payment is 100%, all by T/T.
Price validity: One month
Warranty: 18 months after delivery (excluding natural disasters, human factors, improper use, etc.)

Deliver, Shipping, And Serving

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FAQ

Q: When to use a dry-type transformer?

A: Dry-type transformers are often used for small and medium-voltage applications, making them ideal for the utility, industrial, and commercial industries. They also have copper or aluminum windings that are sealed in varnish. Different variations exist depending on your application and environment.

Q: What is the voltage range of a dry-type transformer?

A: Traditionally, dry-type transformers are used for distribution and industrial applications with rated power and voltage not higher than 15 MVA and 36 kV. Hitachi Energy now also offers dry-type transformers for the 52 kV and the 72.5 kV voltage classes with a power rating of up to 63 MVA.

Q: What is the temperature setting for a dry-type transformer?

A: Dry-type transformers generally trip at around 130°C, while oil-immersed transformers trip at around 90°C. The ambient temperature specifications for transformers are a maximum of 40°C, a minimum of -25°C for outdoor transformers, and a minimum of -5°C for indoor transformers.

Q: What are the ventilation requirements for a dry-type transformer?

A: This will usually require approximately 3 m3/min of air per kilowatt of transformer loss. The area of ventilating opening required depends upon the height of the room, the location of openings, and the maximum loads to be carried by the transformer.

Q: What is the temperature controller for a dry-type transformer?

A: Transformer Temperature Controller senses the temperature of the winding of Dry dry-type Transformer and tries to control it by taking necessary action, such as starting a Fan or raising an alarm, or in the worst case, tripping the Transformer.

Q: What is the permissible overload percent for dry-type transformers?

A: According to ANSI standards, these transformers can sustain 200% of their nameplate load for one-half hour, 150% load for one hour, and 125% load for four hours, as long as a constant 50% load precedes and follows the overload.

Q: When performing maintenance on dry-type transformers?

A: During maintenance on dry-type transformers, checking for cracked insulators is especially important for transformers over 13 kV. This check is crucial for safety, performance, and preventive maintenance. Regular inspections help identify issues that can lead to significant electrical faults or failures.

Q: What dry-type transformers installed outdoors have?

A: Outdoor dry-type transformers must be housed in weatherproof enclosures. For transformers with a capacity greater than 112.5 kVA, they should be positioned at least 300 mm (12 inches) away from combustible building materials.

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