---
description: Demiks' unrivaled high quality oil immersed power transformers meet all modern reliability and efficiency standards.
title: Oil Immersed Power Transformer - Quality Transformers from China - DEMIKS
image: https://demikspower.com/wp-content/uploads/2025/05/2-142.png
---
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# Oil Immersed Power Transformer
## Top Oil Immersed Power Transformer Manufacturers and Suppliers in China
At DEMIKS, we offer Oil Immersed Power Transformers which showcase the unparalleled commitment we devote to reliability, efficiency, and modern engineering. Tailored for the industrial, commercial, and utility domains, these transformers guarantee constant power availability and smooth integration into intricate systems.
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## Oil Immersed Power Transformer: Ensuring Reliable High Voltage Electric Power
- **Key Role in Power Transmission**: It is pivotal for the smooth running of high volt electricity transmission while assuring non-stop power supply and safety when oil immersed.
- **Core Functionality**: They utilize coils and a silicon steel core to perform electromagnetic induction and step down voltage.
- **Oil as Insulation**: For safety, efficiency and long-term durability, oil is crucial as an insulator and as a coolant.
- **Business Efficiency**: With consistent transformer surveillance, this additionally acts as a mechanical protective feature, and reduces the probability of component overheating, avoiding disruption in the intended operational service level.
## Key Features of Our Oil Immersed Power Transformer
Choosing DEMIKS means choosing a transformer with exemplary performance, leading safety features, and outstanding sustainable factors.
### Design
Advanced materials, structure, and technologies enhance reliability.
### Structure
Steel strap/beams increase clamping force and rigidity and impact resistance.
### Appearance
Functionality with beauty. Advanced aesthetics and geometry.
### Performance
Reliable operation; anti-short circuit, low loss, low noise.
### Standards
Meets GB 1094, GB/T 6451, GB/T 15164, GB2536.
### Purpose
Critical for transformer transfer, assesses DC resistance of coils and inductive components.
### How to Diagnose Transformer Internal Faults in Oil Immersed Transformers?
- Observe defects such as noise, temperature, and electrical output.
- Employ dissolved gas analysis to identify fault gases that show possible insulation problems.
- Use thermography to locate and measure temperatures of the hot spots.
- Perform current critique for wiring/winding conflicts.
- Incorporate routine inspections and proactive maintenance strategies.
### What Are the Lifespan and Reliability Factors of Oil Immersed Power Transformers?
- The lifespan depends on the degradation of insulation, operating conditions, and upkeep.
- Primary concerns consist of oil grade, load scheduling, and temperature regulation.
- Fails can be mitigated with proactive strategies such as routine oil examinations and cooling system inspections.
- The environmental factors also greatly influence long-term durability.
## Technical Specifications of Oil Immersed Power Transformer
| Feature | Specification |
| --- | --- |
| Power Ratings | Up to 10 MVA |
| Primary Voltage | Up to 36 kV |
| Cooling Methods | ONAN, KNAN, or KNAF |
| Standards Compliance | IEC, IEEE/ANSI, CSA |
| Core Material | High-grade silicon steel |
| Winding Material | Copper or aluminum (optional) |
| Insulating Fluid | Mineral oil or natural ester fluid |
| Fire Resistance | High flash/fire point (>300 °C) |
- [35kv Oil Immersed Power Transformer PDF](https://demikspower.com/wp-content/uploads/2025/05/35kV-Oil-immersed-power-transformer.pdf)
Industries We Serve
## Common Applications for Oil Immersed Power Transformer
Generation Facilities
Function as step-up transformers to enhance power delivery to transfer.
Distribution Networks
Supply energy to residential, commercial, and industrial areas with reliable and uninterrupted power.
Industrial Operations
Applicable to advanced manufacturing systems and powered complex industrial equipment.
Renewable Energy Projects
Integrate with wind farms and solar power systems as well as hydroelectric setups.
Learn more
[Get a Quote](#elementor-action%3Aaction%3Dpopup%3Aopen%26settings%3DeyJpZCI6IjI1MyIsInRvZ2dsZSI6ZmFsc2V9)
## Why Choose Our High Quality Oil Immersed Power Transformer
- **Uncompromising Quality**: All DEMIKS transformers undergo strict quality checks during manufacturing which ensures exceptional performance and a long life span.
- **Innovative Engineering**: We manufacture transformers on modern technology as well as unique and accurate registration which guarantees maximum output performance and dependability.
- **Global Expertise**: DEMIKS transformers have decades of global industry experience which makes them an asset to virtually any industry.
- **Responsive Support**: For full customer satisfaction, our support staff provides installation, maintenance and troubleshooting guidance completely worry-free, at any hour on any day.
## What Our Client Says
Listen to our customers who have received benefits from using our oil immersed power transformers:
"The installation of a DEMIKS Oil Immersed Power Transformer at our wind farm has unlocked new levels of operational energy efficiency. In addition, the transformer’s insulating fluid’s biodegradable nature supports sustainability objectives.”
Linda
Renewable Energy Specialist
“Thank you for emphasizing the safety part. For our remote mining site, the fire resistance and zero leakage of DEMIKS transformers is fire safe and unparalleled in leakage protection.”
Rachel
Safety Engineer
## Expert Guides to Oil Immersed Power Transformer
### Why We Use Oil in Transformer
The application of transformer oil to a transformer serves the purpose of cooling and insulation, owing to its considerable dielectric strength and thermal conductivity.
### What Oil Is Used in a Transformer
Transformers normally utilize mineral oil; however, silicone oil and FR3® fluid can also be employed for cooling and insulation purposes.
### How to Use Transformer Oil
Transformer oil is introduced into the transformer via a pumping mechanism which provides a sealed system for the protection against air entrapment, thus maintaining insulation.
### How Much Oil Is Used in Transformer
An oil-filled transformer’s capacity differs with its size; small distribution transformers have an oil capacity of 50 to 300 liters, while medium-sized power transformers require between 1000 to 5000 liters.
### Oil Immersed Power Transformer Market
The globally immersed oil power transformer market volume is anticipated to expand remarkably, from $21.2 billion in 2023 to an estimated $28.3 billion by 2028.
### What Are the Types of Cooling in Oil-Immersed Power Transformer?
In oil-immersed power transformers, the cooling methods are: Oil Natural Air Natural (ONAN), Oil Natural Air Forced (ONAF), Oil Forced Air Forced (OFAF), and Oil Forced Water Forced (OFWF).
### What Happens When a Transformer Leaks Oil?
When a transformer leaks oil, it risks losing insulation and cooling efficiency which can lead to overheating, potential environmental pollution, and damage to internal components.
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## Related machines provided by DEMIKS
Dry Type Transformer Top Dry Type Transformer Manufacturers and Suppliers...
[Read More](https://demikspower.com/dry-type-transformer/)
Oil-immersed Transformer Top Oil-immersed Transformer Manufacturers and Suppliers in China...
[Read More](https://demikspower.com/oil-immersed-transformer/)
Top HV Hi-pot Test Transformer Manufacturers and Suppliers in China...
[Read More](https://demikspower.com/high-voltage-test-equipment/test-transformer/)
## Latest Blog Posts
For topical and field-related best practices, strategies, innovations, and insights, follow the blog and maintain inventiveness.
[](https://demikspower.com/blog/onan-vs-onaf/)
[DEMIKS Blogs](https://demikspower.com/blog/category/demiks-blogs/)
[ONAN vs ONAF Transformer Cooling: Ratings, Losses and Selection](https://demikspower.com/blog/onan-vs-onaf/)
ONAN versus ONAF refers to the external airflow. ONAN means Oil Natural Air Natural: oil circulates by buoyancy and ambient air removes heat from the radiators. ONAF means Oil...
[October 28, 2026](https://demikspower.com/blog/onan-vs-onaf/) | By [XCX](https://demikspower.com/author/xcx/)
[](https://demikspower.com/blog/pd-testing-system-with-simple-workflow/)
[DEMIKS Blogs](https://demikspower.com/blog/category/demiks-blogs/)
[PD Testing System With Simple Workflow: 8 Essential Steps](https://demikspower.com/blog/pd-testing-system-with-simple-workflow/)
Reviewed by the DEMIKS technical team · Focus keyword: pd testing system with simple workflow A simple partial-discharge workflow is a complete method-to-report chain. It eliminates needless handoffs, while...
[October 27, 2026](https://demikspower.com/blog/pd-testing-system-with-simple-workflow/) | By [XCX](https://demikspower.com/author/xcx/)
[](https://demikspower.com/blog/pd-testing-workflow-inefficient/)
[DEMIKS Blogs](https://demikspower.com/blog/category/demiks-blogs/)
[Why Your Partial Discharge Testing Workflow Is Inefficient](https://demikspower.com/blog/pd-testing-workflow-inefficient/)
If you find your PD testing workflow inefficient, measure where each job waits or repeats. For files stalled before review, separate measurement time from waiting time. Electrical partial discharge...
[October 26, 2026](https://demikspower.com/blog/pd-testing-workflow-inefficient/) | By [XCX](https://demikspower.com/author/xcx/)
[](https://demikspower.com/blog/how-to-perform-pd-testing-during-fat/)
[DEMIKS Blogs](https://demikspower.com/blog/category/demiks-blogs/)
[How to Perform PD Testing During FAT and Keep the Results Traceable](https://demikspower.com/blog/how-to-perform-pd-testing-during-fat/)
A factory partial discharge test consists of six major steps: agree on the method, prepare the bay, calibrate the installed circuit, run the approved sequence, investigate the signals, and...
[October 23, 2026](https://demikspower.com/blog/how-to-perform-pd-testing-during-fat/) | By [Karry](https://demikspower.com/author/karry/)
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## Getting a quote for High Quality Oil Immersed Power Transformer
We are prepared to assist you with queries and propose solutions aligned with your strategic objectives. Enhance your projects now with DEMIKS Oil Immersed Power Transformers!
[Get in Touch Today](#elementor-action%3Aaction%3Dpopup%3Aopen%26settings%3DeyJpZCI6IjI1MyIsInRvZ2dsZSI6ZmFsc2V9)
## Frequently Ask Questions
### Q: What is an oil-immersed power transformer?
A: an oil-immersed power transformer is a type of transformer that uses oil as coolant and an insulator simultaneously. The oil circulates around the oil immersed transformers bringing the required advantage of cooling and insulation for the conductors.
### Q: How does an oil-immersed power transformer function?
A: Oil-immersed power transformers utilize oil and paper separators to ensure effective energy flow. The circulating oil dissipates the heat produced due to the flow of electrical current. It helps controll the temperature of the transformer during the operation which improves its efficiency.
### Q: What are the advantages of oil-filled transformers?
A: The major benefits of these transformers include exceptional thermal management, superior insulation, long service life, and robustness. Compared to dry-type transformers, oil-filled transformers have a significantly higher load bearing capacity. They can also operate over a much broader temperature range. Moreover, their configuration makes them suitable for a range of energy projects, especially for use in power transmission and distribution.
### Q: In what manner does oil quality impact the performance of transformers?
A: Oil quality is directly related with an oil immersed power transformer as it affects its performance qualitatively. It negatively affects the performance of the transformer if the oil is not contaminated. Thus, maintenance is required to test the oil regularly in order to enable detection of faults prior to failure.
### Q: What is the significance of the insulation material with regard to the design of power transformers?
A: The role of insulation materials in the design power transformers, especially immersed in oil, are very vital. Gaps between conductors must have proper di-electric strength, preventing discharges and ensuring protection to the transformer.
### Q: Which methods are available for the detection of transformer faults with respect to immersion in oil?
A: One of the most effective methods for determining transformer faults with connection to immersion in oil would be dissolved gas analysis. Thermodynamic processes make it possible to analyze certain gases in hybrid fluids providing the possibility to find precursors: overheating, arcing, and insulation breakdown.
### Q: What is phase drying and why is it particularly significant for oil-immersed power transformers?
A: Phase drying is a technique of removing moisture in oil-immersed power transformers. Moisture in the oil and insulation paper degrades the performance and longevity of the transformer. Low amounts of moisture during phase drying reduce the chances of transformer faults, and improves the reliability of the transformer in the long term.
### Q: Can all voltage levels make use of oil-immersed power transformers?
A: Oil-immersed power transformers are predominantly used for high-voltage applications, as they are not designed for low-voltage use. Due to their rugged construction and superior cooling features, they are well-suited for multi-million kVA energy projects.
### Q: What environmental factors need to be taken into account with oil-filled transformers?
A: For oil-filled transformers, the primary concern is the possible leakage of oil which may not only contaminate the soil but groundwater as well. As a result, fully enclosed designs of transformers are executed and some even use negative pressure systems to mitigate ecological damage. For these types of systems, preventative maintenance is needed to monitor the oil and the integrity of the system.
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