Home / Products / Oil Immersed Transformer

Oil Immersed Transformer

Your Professional Oil Immersed Transformer Supplier

Baoding Tianwei Baogian Power Equipment Co., Ltd. is a professional manufacturer and solution provider for intelligent power equipment. We focus on high-voltage transformers, switchgear, box-type substations, and intelligent monitoring and fault early warning systems. Our products are widely used in power transmission and distribution networks, industrial manufacturing, commercial infrastructure, and renewable energy projects. With certified quality systems and strong engineering capability, we deliver safe, reliable, and cost-effective solutions to domestic and international customers.

Comprehensive Power Equipment Capability
We offer a complete range of transformers, switchgear, substations, and intelligent monitoring systems covering 0.4kV–220kV and up to 100,000kVA, supporting power grids, industry, infrastructure, and renewable energy projects.

Certified Quality
Our operations follow ISO9001, ISO14001, and ISO45001 systems. Full in-house production and testing equipment ensure stable performance, safety, and consistent compliance with international standards.

Custom Solutions
An experienced engineering team, supported by long-term cooperation with leading universities, provides project analysis, customized designs, and reliable solutions for complex and high-demand applications.

Full Lifecycle Service Support
From technical consultation and system design to installation guidance, maintenance, and upgrades, we deliver long-term support to ensure reliable operation and lower total ownership cost.

Oil Immersed Distribution Transformer
The oil-immersed distribution transformer is engineered for high energy-saving efficiency, quiet operation, and superior reliability. This transformer delivers excellent electrical performance,...
read more
Oil Immersed Type Transformer
The oil immersed transformer is a key device for voltage conversion in power systems, reducing 10(6)/35kV to usable 230/400V levels. This type of oil immersed transformer uses oil as its primary...
read more
Three Phase Oil Immersed Transformer
The three-phase oil-immersed transformer is a medium-low voltage distribution equipment characterized by its fully sealed corrugated tank. Designed for indoor and outdoor applications at altitudes...
read more
1000 Kva Oil Filled Transformer
This 1000 kVA oil-immersed transformer is a core component for medium-to-low voltage power distribution, efficiently stepping down 10(6)/ 35kV to 230/ 400V. Designed for altitudes up to 1000m,...
read more
Oil Immersed Self Cooled Transformer
An Oil-immersed Self-cooling Transformer is one of the most common and technologically mature types of power transformers. Its core operating principle utilizes transformer oil as both an...
read more
Oil Filled Water Cooled Transformer
This oil-immersed water-cooled transformer is designed for high-capacity power distribution, leveraging a forced oil circulation system where heat is efficiently transferred to water through a...
read more

Parameter

Model	Rated capacity(kVA)	No-load loss(W)	Dy Load Loss(W)
S13-M-30	30	80	600
S13-M-50	50	100	870
S13-M-63	63	110	1040
S13-M-80	80	130	1250
S13-M-100	100	150	1500
S13-M-125	125	170	1800
S13-M-160	160	200	2200
S13-M-200	200	240	2600
S13-M-250	250	290	3060
S13-M-315	315	340	3650
S13-M-400	400	410	4300
S13-M-500	500	480	5150
S13-M-630	630	570	5650
S13-M-800	800	700	6200
S13-M-1000	1000	830	7500
S13-M-1250	1250	970	10300
S13-M-1600	1600	1170	12000
S13-M-2000	2000	1360	13500

Types of Oil Immersed Transformer

The oil immersed transformers produced by our company mainly include the following types:

Three Phase Oil Immersed Transformer

The three-phase oil-immersed transformer is a medium-low voltage distribution equipment characterized by its fully sealed corrugated tank.

1000 Kva Oil Filled Transformer

This 1000 kVA oil-immersed transformer is a core component for medium-to-low voltage power distribution, efficiently stepping down 10(6)/ 35kV to 230/ 400V.

Oil Immersed Self Cooled Transformer

An Oil-immersed Self-cooling Transformer is one of the most common and technologically mature types of power transformers. Its core operating principle utilizes transformer oil as both an insulating and cooling medium.

Advantages of Oil Immersed Transformer

1000 Kva Oil Filled Transformer suppliers

Cost-Effective
They allow for cheap installation and maintenance and the need for change is minimal since the transformer is robust.

Reliable and Durable
The transformers can sustain a variety of environmental conditions with low rates of failure which makes them dependable for long periods.

High Efficiency
Less energy losses, enable oil immersed transformers to perform excellently under heavy loads.

Efficient Cooling
Oil absorbs dissolves and radiates heat efficiently to avoid overheating of the transformer as well as consistent transformer operation at high loads.

Enhanced Insulation and Safety
The oil acts as an insulating cover for the windings reducing the risk of electrical discharges and increasing the life span of the transformer.

Versatile Applications
They can be used for power networks, renewable energy systems, and industrial applications since they come in different sizes and capacities.

Safety Features
They contain protective devices such as the Buchholz relay which prevents damage by detecting acids. In addition, there is moisture protection which has a silica gel breather.

Applications of Oil Immersed Transformer

Oil Immersed Self Cooled Transformer suppliers

Power Stations

To step up or step down the voltage between the generator and the transmission lines.

Substations

They help reduce the voltage from high transmission levels to lower levels suitable for distribution to homes and businesses.

Three Phase Oil Immersed Transformer factory

Industrial Facilities

Many factories and large plants rely on these transformers to power heavy machinery.

Renewable Energy Systems

In solar and wind power facilities, oil-immersed transformers are often used to integrate energy generated at high voltages into the grid.

Oil Immersed Transformers Vs. Dry Type Transformers: Comparison

Feature	Oil Filled Transformers	Dry Type Transformers	Key Difference
Cooling Medium	Mineral/Synthetic Oil	Air/Natural Convection	Liquid vs. Air Cooling
Maintenance Needs	Requires oil testing	Minimal	Oil handling vs. dry design
Fire Safety	Needs containment/fire systems	Naturally fire-resistant	Higher fire risk for oil types
Installation Location	Indoor & Outdoor	Mostly Indoor	Flexibility vs. Safety Requirements
Power Capacity	High (up to grid-scale)	Lower (typically under 20 MVA)	Suitable for high-demand use cases
Energy Efficiency	Slightly higher on average	Slightly lower	Oil improves heat dissipation

Oil Immersed Transformer Maintenance Checklist

Three Phase Oil Immersed Transformer suppliers

1. Ensure that the transformer is de-energized and offline before performing any maintenance work.

2. Visually inspect the equipment for any rust, dirt accumulation, chipped paint, or discoloration.

3. Listen to the unit when it is energized for any signs of abnormal vibrations or noise.

4. Clean the transformer and remove all signs of dust, debris, and dirt from it.

5. Check the transformer temperature and oil level indicators.

6. Inspect all cables, bolts, and hardware for tightness. Tighten anything that may be loose.

7. Re-energize the transformer before performing tests and analyses like breakdown voltage testing or infrared temperature analysis.

8. Inspect the transformer for signs of leakages. If found, address the leak immediately. If a transformer leaks often, it might be better to fully replace the transformer unit. Common sources of transformer oil leaks are bad gaskets, improperly welded points, and the presence of rust on the bottom of the unit.

9. Record all events and conditions of the maintenance work. For example, note down the names of the workers, which parts of the transformer they work on, how and when they do their maintenance duties, etc.

Ordering Process

Inquiry - quotation - communication - order confirming - deposit payment - production - testing and debugging - balance payment - packing - delivery - customer receiving - after service.

Packaging and Shipping

Packaging	Wooden Crate, Steel Frame with Shrink Wrap
Shipping	Shipping by sea, by air, by express are acceptable. According to your requirements.

Our Factory

Baoding is located in the middle of the North China Plain, more than 30 kilometers away from Xiong'an New Area.

Our Certificates

Quality Management System certification GB/T19001-2016/IS09001:2015, Environmental Management System certification GB/T24001-2016/IS014001:2015, Occupational Health and Safety Management System certification GB/T45001-2020/IS045001:2018, Certified Quality Testing Accredited by CNAS

FAQ

Q: What are oil-immersed transformers used for?

A: They are critical components for high-voltage power transmission and distribution, highly valued for their superior performance under sustained heavy loads. They are deployed extensively in utilities, large industrial facilities, and demanding commercial centers where reliability is paramount.

Q: What is the lifespan of oil-immersed transformers?

A: With adherence to a stringent predictive maintenance protocol—primarily focused on Dissolved Gas Analysis (DGA) and oil quality checks—these units are engineered to achieve an operational lifespan often exceeding 30 years.

Q: Are oil-immersed transformers environmentally friendly?

A: Yes, when managed responsibly. Their environmental impact is minimized by adhering to strict oil recycling and disposal protocols, and by utilizing natural or synthetic ester fluids, which are readily biodegradable alternatives to mineral oil.

Q: What safety features do oil-immersed transformers have?

A: They are equipped with multiple safety mechanisms, including Pressure Relief Valves to manage internal pressure, thermal sensors for overheating prevention, and robust hermetic sealing to prevent external contamination and oil spills.

Q: Can oil-filled transformers work in extreme temperatures?

A: Yes. Many are designed to operate between -40°C to +50°C, depending on the cooling type and oil used.

Q: How do oil-filled transformers work?

A: The windings and core are submerged in transformer oil. It acts as a cooling agent and an insulator. Convection moves the oil through the windings, coils, and core, keeping the transformer from overheating. Oil is further cooled externally at lower voltage and in an air-cooled radiator with higher voltages.

As one of the leading oil immersed transformer manufacturers and suppliers in China, we also support customized service. With over 20 years' experience, we warmly welcome you to buy high quality oil immersed transformer made in China here from our factory. For price consultation, contact us.

ester oil filled transformer, oil filled pad mounted transformer, oil natural cooling of transformer