Tenrony

Oil-Immersed Transformer

Tenrony’s oil immersed transformer is dedicated to delivering reliable and high-performance substation transformers that effectively meet customers' power distribution equipment list requirements, while maintaining the highest standards of safety and reliability. Our oil immersed transformer wholesale options are engineered for ease of installation, operation, and maintenance, and are designed to endure the demanding conditions of industrial and electrical environments. These oil immersed distribution transformers are widely applicable across industries such as manufacturing, commerce, construction, transportation, and other related fields.

 

Core Features: Our products are safe, stable, and practical, with ISO and CE certifications, ensuring reliability and adaptability.

 

Technical Capability: Over 20 years of experience and a professional R&D team provide customized solutions and expert consultation.

 

Production Capacity: A 3,000+ sqm facility, 200+ workers, and modern production lines ensure high efficiency and quality consistency.

 

Delivery Reliability: Fast, on-time delivery with strict quality control across all production stages.

 

Market Reputation: 20+ years of experience, serving a diverse customer base including small businesses, large factories, and government units.

 

Types of Oil-Immersed Transformer Wholesale

SF20-8000KVA Power Transformer

Power Distribution Transformer With High efficiency & Energy saving

On-load Capacity and Voltage Regulation Transformer

6KV-11KV Oil Immersed Distribution Transformer

Three Phase Oil Immersed Distribution Transformer

High Voltage Electricity Transmission Power Distribution Transformer

630KVA 11KV Energy-efficient Oil-immersed Power Electrical Transformer

11KV S11 Oil-immersed Power Transformer

Single Phase Ground Mounted Transformer

Single Phase Pole Mounted Transformer

 

Key Features of Tenrony's Oil-Immersed Transformers

Scientific structural

Based on a traditional structural design and mature manufacturing technology, products from leading oil immersed distribution transformer manufacturers like Tenrony have undergone numerous improvements and offer the following advantages:

 

The spiral winding with longitudinal air ducts provides enhanced internal heat dissipation performance.

 

Improved effective support at the coil end face increases the oil immersed transformer's ability to withstand short-circuit currents.

 

A new lifting structure and body positioning system have been adopted, ensuring greater reliability during long-distance transportation and operation.

 

The implementation of a unique and reliable structural design contributes to more stable product performance.

 

High-quality silicon steel sheets with superior magnetic properties are used in the core, resulting in improved energy efficiency, reduced noise levels, and an overall higher technical standard.

 

The oil immersed distribution transformer employs a cast structure, while the internal air channels utilize a prismatic configuration. This design expands the heat dissipation space, accelerates air circulation, prevents and delays insulation degradation and moisture absorption, thereby enhancing operational reliability and enabling maintenance-free normal operation.

 

High-Quality Material

All raw materials used in oil immersed transformers undergo rigorous inspection, and all material suppliers are strictly evaluated in accordance with the ISO 9000 international quality management standard.

 

Oxygen-free copper wire with lower resistivity is selected. After a series of advanced surface treatments, the wire surface becomes smoother and free of burrs or sharp edges, thereby reducing oil immersed transformer load losses and enhancing electrical performance reliability.

 

With the improvement of performance levels, silicon steel sheets with lower unit losses are employed, resulting in reduced no-load losses of the immersed transformer.

 

High-quality laminated wood insulation components are selected, which remain crack-free and stable even under the mechanical stress of short-circuit currents.

 

The use of premium insulation materials ensures superior insulation performance, enhanced product quality and reliability, and improved operational stability of the oil immersed distribution transformer.

 

High-performance rubber sealing materials are selected to provide effective resistance against aging.

 

Equipment Durability

All components of the oil immersed transformer are certified products that comply with the inspection and testing requirements set by relevant national regulatory bodies. These oil immersed distribution transformer components are designed to operate without causing adverse effects and are environmentally safe. The service life of the oil immersed distribution transformer equipment can reach up to 40 years, during which no replacement of components or vulnerable parts is required. As a result, the oil immersed transformer is highly durable and requires minimal maintenance throughout its operational lifespan.

 

Comprehensive Equipment Evaluation

The oil immersed transformer offers excellent safety performance, with fire-resistant and pollution-free characteristics, enabling direct installation and operation in load centers.

 

Utilizing advanced domestic manufacturing technology, the oil immersed transformer features high mechanical strength, strong short-circuit resistance, low partial discharge levels, superior thermal stability, high reliability, and an extended service life.

 

The oil immersed power transformer demonstrates low energy losses, reduced noise emissions, significant energy-saving effects, and requires no maintenance during operation.

 

The oil immersed transformer provides efficient heat dissipation and strong overload capacity; forced air cooling can further enhance oil immersed transformer operational capacity.

 

This type of oil immersed transformer possesses excellent moisture resistance, allowing reliable operation in high-humidity and other challenging environmental conditions.

 

A comprehensive temperature monitoring and protection system is integrated into the design. This fully oil immersed transformer automatic system requires no manual intervention, offering a high level of automation and robust protective functionality.

 

The oil immersed transformer unit features a compact structure and lightweight design, occupying minimal space and reducing installation costs.

 

In practical substation deployments, oil-immersed transformers are often delivered as part of an integrated power distribution system. To match different installation environments, we can provide alternative solutions with dry type transformers, and coordinate the upstream/downstream connections with our high voltage switchgear for sale to form a safer and more reliable turnkey package.

 

Oil Immersed Transformer Manufacturing Process

Oil Immersed Transformer Manufacturing Process

At Tenrony, every oil immersed transformer follows strict manufacturing procedures to ensure product reliability and consistent performance.

 

1. Core Manufacturing

High-quality electrical steel is processed to reduce energy losses and improve transformer efficiency.

 

2. Coil Winding

Transformer windings are manufactured with precise control to ensure electrical performance and mechanical strength.

 

3. Assembly and Testing

Core, coils and transformer components are assembled according to technical specifications.

 

4. Oil Filling and Inspection

Transformer oil is filled under controlled conditions, followed by electrical and performance testing before shipment.

 

Why Choose Tenrony as Your Oil Immersed Transformer Supplier?

Professional Transformer Manufacturing Experience

Tenrony focuses on power distribution equipment manufacturing and provides transformer solutions for global industrial and utility customers.

 

Strict Quality Control

Each transformer undergoes inspection and testing procedures to verify electrical performance, reliability and operational safety.

 

Customized Transformer Solutions

We support customized requirements including:

 

Voltage ratings

 

Capacity selection

 

Structural design

 

Application-specific configurations

 

Global Project Support

Tenrony works with international customers to provide technical communication, product customization and project support.

 

Applications of Oil Immersed Transformers

Oil immersed transformers are widely used in power systems where high reliability, efficient cooling and long service life are required.

 

Industrial Power Distribution

Factories and industrial facilities rely on oil immersed transformers for stable electricity supply and voltage conversion.

 

Renewable Energy Projects

Solar power plants and renewable energy systems use oil immersed transformers to connect generated electricity with distribution networks.

 

Utility Power Networks

Utility companies use oil immersed transformers in substations and distribution systems to support reliable electricity transmission.

 

Infrastructure Projects

Oil immersed transformers provide dependable power solutions for transportation, commercial and public infrastructure.

 

Successful Cases of Oil-Immersed Transformers

Successfully completed a highly challenging and reliable power Equipment

Zhejiang Tenrony Electric Equipment Co.,Ltd.(hereinafter referred to as Tenrony Electric) successfully completed a highly challenging and reliable power Equipment delivery task-delivering a set of 35kV mine sled-type mobile substation to the open-pit mining area of China National Cocal Group Pingshuo Company in Pinglu District, Shuozou City, Shanxi province. The project has now been smoothly put into operation on site, marking another benchmark set bu Tenrony Electric in the field of special power equipment for extreme environments.

 

Patent Technology Registration

On June 25, 2025, our company participated in the bidding for ' China Coal Pingshuo Group Co., Ltd., March 2025 mobile substation equipment procurement project '. Because of our company's novel product design, and in the product technical parameters, shape structure, manufacturing process, and enterprise comprehensive strength, there are great advantages, stand out among dozens of competitive enterprises, and successfully won the bid

 

Custom Oil-Immersed Transformers & On-Load Tap Changers Shipped for Critical Power Infrastructure Upgrade

ZHEJIANG, CHINA | [Current Date] — Zhejiang Tenrony Electric Co., Ltd. (Tenrony Electric) has successfully dispatched a full order of CE-certified oil-immersed transformers and intelligent on-load tap changers (OLTC) to a key power infrastructure project in Laos. The shipment includes multiple units across critical capacities: 8000kVA, 2000kVA, 1000kVA, and 500kVA, engineered to enhance grid stability and support industrial expansion in northern Laos.

 

Successfully completed a highly challenging and reliable power Equipment

Zhejiang Tenrony Electric Equipment Co.,Ltd.(hereinafter referred to as Tenrony Electric) successfully completed a highly challenging and reliable power Equipment delivery task-delivering a set of 35kV mine sled-type mobile substation to the open-pit mining area of China National Cocal Group Pingshuo Company in Pinglu District, Shuozou City, Shanxi province. The project has now been smoothly put into operation on site, marking another benchmark set bu Tenrony Electric in the field of special power equipment for extreme environments.

 

Patent Technology Registration

On June 25, 2025, our company participated in the bidding for ' China Coal Pingshuo Group Co., Ltd., March 2025 mobile substation equipment procurement project '. Because of our company's novel product design, and in the product technical parameters, shape structure, manufacturing process, and enterprise comprehensive strength, there are great advantages, stand out among dozens of competitive enterprises, and successfully won the bid

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Oil-Immersed Transformer FAQs

Q

What is an oil immersed transformer used for?

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A

Oil immersed transformers are mainly used for power transmission, industrial distribution, utility networks and renewable energy projects where reliable voltage conversion is required.

 

Q

What is the difference between oil immersed and dry type transformers?

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A

Oil immersed transformers use insulating oil for cooling and insulation, while dry type transformers use air or solid insulation materials. Oil immersed transformers are commonly preferred for higher capacity and outdoor applications.

 

Q

How long does an oil immersed transformer last?

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A

With proper installation, maintenance and operating conditions, oil immersed transformers can provide reliable service for several decades.

 

Q

Can Tenrony provide customized oil immersed transformers?

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A

Yes. Tenrony can customize transformer solutions according to voltage level, rated capacity, application environment and project requirements.

 

Q

How often do I need to change the transformer oil?

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A

When grounding the power transformer,oil immersed transformer is essential to strictly adhere to the provided drawings and ensure the effectiveness and reliability of the grounding system.

 

Q

Does the oil immersed type transformer need a dedicated enclosure?

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A

A specialized enclosure is required for theoil immersed distribution transformer when there is no dedicated isolated shielding space available for oil immersed transformer installation.

 

Q

Is an oil immersed power transformer AC or DC?

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A

Oil immersed Power transformers are designed for use in alternating current (AC) power systems.

 

Q

Can I use an oil immersed transformer to step up or step down voltage?

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A

Oil immersed Transformers are capable of stepping up or stepping down voltage levels in electrical power systems.

 

Q

What is the lifespan of an oil immersed power transformer?

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A

Under normal operating conditions, oil immersed power transformers are designed for a service life of up to 40 years.

 

Q

What is the warranty on your oil immersed distribution transformer for sale?

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A

The oil immersed transformer is essentially a maintenance-free device, requiring only minimal periodic inspections. Typically, products from professional oil immersed transformer manufacturers like Tenrony undergoes routine inspection once annually and a more comprehensive check every ten years.

 

As one of power distribution equipment manufacturers, we will do our best to meet all the needs of customers.

THREE PHASE OIL IMMERSED DISTRIBUTION TRANSFORMER

THREE PHASE OIL IMMERSED DISTRIBUTION TRANSFORMER

The 3 phase distribution transformer was developed by Tenrony based on the original distribution transformer. Through the research and application of new materials and new processes, as well as the combination of independent innovation and technology introduction, and through the optimized and innovative design of the core and coil structure, oil immersed distribution transformer aims to reduce no-load losses and noise.

 

As a self-developed power distribution equipment, the average no-load loss has decreased by 37%. The noise level has decreased by an average of 20%compared with the current national standard JB/T10088-2004, and the three phase distribution transformer performance level has reached the advanced domestic level.

 

Features

Three phase distribution transformer bases on traditional structure and mature technology. This power distribution equipment has made many improvements, including:

 

Adopting a spiral coil with longitudinal oil passages for better internal heat dissipation.

 

Improving the effective support of the coil end face for stronger short-circuit current resistance.

 

3 phase distribution transformer uses a new lifting structure and body positioning structure to ensure greater reliability during long-distance transportation and operation.

 

The oil tank adopts a fully sealed structure, isolating the transformer from the atmosphere, preventing and slowing down oil degradation and insulation moisture, enhancing operational reliability, and requiring no maintenance during normal operation.

 

Benefits

3 phase power distribution also has many unique and reliable structures to serve you.

 

By selecting transformers with higher performance levels, three phase distribution transformer will have a higher level of technical content.

 

Execution standards

 

In addition to meeting the requirements of the national standard GB 20052-2020 for product performance, this three phase oil immersed distribution transformer series also complies with the following national standards: GB/T1094.1, GB/T1094.2、JB/T10088 、GB/T1094.3、GB/T1094.5、GB/T25289、GB/T6451、GB/T7595、JB/T3887.

 

Note: All three phase distribution transformer products produced by 3 phase distribution transformer company meet the latest versions of the national standards mentioned above.

 

Use

Environmental conditions for use

 

Altitude: Not exceeding 1000m;

 

Ambient temperature: Maximum air temperature+40℃; Hottest monthly average temperature+30℃; Highest annual average temperature+20℃; Outdoor minimum temperature-25℃.

 

The waveform of the power supply voltage is approximately sinusoidal.

 

For a three-phase transformer, the three-phase power supply voltage should be roughly symmetrical.

 

Installation environment: There is no obvious contamination in the installation environment.

 

Ground acceleration for seismic events: Horizontal direction is less than 3m/s², vertical direction is less than 1.5m/s².

 

Special conditions of use: Any special conditions of use beyond the normal operating conditions of the transformer should be specified at the time of inquiry and ordering.

 

As one of 3 phase transformer manufacturers, we will do our best to meet all the needs of customers.

 

If you are looking for a reliable electrical distribution company, please choose us, and we will be your best partner.

SINGLE PHASE GROUND MOUNTED TRANSFORMER

SINGLE PHASE GROUND MOUNTED TRANSFORMER

single phase transformer grounding

Single-phase box-type transformer adopts a dual-voltage design and requires a dual-voltage switching switch for voltage switching. ground mounted transformer design effectively ensures the transformer's adaptability to different power demands, thereby enhancing ground mounted transformer practicality and environmental adaptability. The oil immersed transformer is widely used in various places such as residential areas, commercial centers, hospitals, parks, and schools.

 

Ground mounted transformer is long-lasting.

 

Single phase transformer manufacturers provide free maintenance.

 

Single phase transformer types have efficient space.

 

Ground mounted transformer has safety features.

 

Parameters

Standards designed as IEEE/ANSI, CSA, NEMA, and DOE

 

Rated power from 25 kVA up to 250 KVA

 

Rated insulation level up to 34.5 kV

 

Rated frequency 50 or 60 Hz

 

Two externally-clamped molded polymer universal high-voltage bushing wells for loop-feed operation or one externally-clamped high-voltage bushing well for loop-feed or radial-feed operation, as specified

 

Naturally, ONAN/KNAN on request

 

Removable flip-top hood opens 180° for easy access with stainless steel hinge pins and requires no special tools for removal

 

Two-position, four-position, or sectionalizing rotary high-voltage load-break switch

 

Bayonet fuse, elsp fuse, and isolation link are available

 

A dual-voltage switch and secondary voltage circuit breaker are available

 

Benefits

High-Efficiency Conversion: Ground mounted transformer ensures stable voltage output.

 

Safe and Reliable: Excellent insulation for secure usage.

 

Flexible Customization: Meets various application needs.

 

Precision Design:Ground mounted transformer has optimized structure for enhanced performance.

 

Strict Material Selection: Use of high-quality materials.

 

Fine Processing: Ensures product accuracy and quality.

 

Use

Tenrony will become your transformer Factory

 

With strict quality control, our quality management personnel will check all products.

 

Ground mounted transformer accepts OEM and ODM, and our transformers meet all kinds of customers’ needs.

 

Has an experienced and strong R&D team to customize special products for you

 

Excellent supply chain management, providing a strong guarantee at any time

 

Single phase transformer manufacturers have a good reputation in the domestic and overseas markets.

 

As one of power transmission manufacturers, we will do our best to meet all the needs of customers.