35KV Oil Type Transformer
The 35KV oil type transformer features an enhanced steel-strap clamp structure for superior short-circuit resistance and low noise. With ONAN cooling and high-efficiency silicon steel cores, this oil immersed type transformer delivers reliable performance for substations, industries, and renewable energy integration. Custom configurations and environmental options available.
Overview of the 35KV Oil Type Transformer
The 35KV oil-filled transformer is a type of transformer used to transmit power over greater distances. It is capable of delivering 35KV of electricity to customers through their medium voltage distribution system. The 35KV oil-filled transformer is manufactured from high-quality materials; it contains high-grade insulation oil and has been designed with a sturdy steel-strap clamp to securely hold together its tank structure. As an oil-immersed type transformer, the 35KV oil-filled transformer provides low losses, offers quiet operation, and has a superior short-circuit withstand capability. This transformer also uses low-loss silicon steel cores as well as copper or aluminum windings to provide efficient voltage regulation and long-term stable performance under high-demand loading conditions.
The 35KV oil-filled transformer is designed to meet international efficiency standards and is built to meet national and international safety regulations. Features included in the 35KV oil-filled transformer are pressure relief devices, Buchholz relays, explosion-proof protection, and comprehensive temperature and oil level monitoring. The 35KV oil-filled transformer can be upgraded from an ONAN self-circulating cooling system to a forced-air system for increased capacity; therefore, the 35KV oil-filled transformer meets all future needs for the development of medium-voltage networks.
- The 35KV-oil-filled transformer has a primary voltage rating of 35KV and a secondary voltage rating of between 0.4KV and 10KV that is suited to the local grid system.
- The 35KV-oil-filled transformer can provide power ratings ranging from 500kVA to 20,000kVA; this range is suitable to serve a wide range of distribution and transmission applications.
- The 35KV-oil-filled transformer has on-load and off-load tap changers, which can be used to adjust the transformer with an adjustment factor of ±2.5% or ±5% to achieve accurate voltage levels.
- The 35KV-oil-filled transformer is available with optional biodegradable oil and with containment systems that will protect against any environmental hazards that may impact sensitive applications.
Benefits and Key Advantages of 35KV Oil-Filled Transformers
High Reliability
Robust tank with corrosion-resistant coating and sealed design ensures dependable performance in harsh industrial and outdoor environments.
Energy Efficiency
With low no-load loss and load losses during operation, it helps to reduce the cost of operating the transformer for its entire design life of over 30 years.
Enhanced Safety
Features multiple levels of protection, including oil relay, bypass, and pressure sensors, ensuring safe operation when overloads or faults occur.
Long Service Life
Rated for continuous operation with little maintenance, utilizing first-quality insulating oil and tough core/coil construction.
Flexible Configuration
Offers flexibility in design to accommodate any geographic location (high altitude, coastal conditions, or extreme pollution) and available options for air cooling and biodegradable oil.
Quiet Operation
The advanced core design keeps noise to a maximum of 65dB at full load, so it can be used in noise-sensitive areas.
Uses & Industries
Distribution of Industrial Power
Provides stable medium voltage power to factories, mines and manufacturing facilities.
Support for Renewable Energy Integration
Increases the voltages produced by wind and solar generation, so that they can be connected to the grid and provide maximum clean energy output.
Urban and Rural Substations
Provides reliable transformation to municipalities and remote areas that support residential, commercial and agricultural loads.
Rail and Transportation
The electrification systems require durable low-maintenance transformers and this series fulfill the traction and signaling power requirements.
Technical Data & Specifications
Typical parameters of a 35KV oil immersed transformer. Detailed dimensional drawings and specification sheets for the type of oil used in the transformer available by request.
| Parameter | Specification |
|---|---|
| Rated Voltage | 35kV (primary), 0.4-10kV (secondary) |
| Power Rating | 500kVA – 20,000kVA |
| Frequency | 50Hz / 60Hz |
| Efficiency | ≥99% at rated load |
| Insulation Class | A (temperature rise ≤65K) |
| Cooling Method | ONAN (Oil Natural Air Natural) |
| Noise Level | ≤65dB (under full load) |
| Impulse Withstand Voltage | 170kV (lightning impulse) |
| Oil Volume | 0.5-5m³ (depending on capacity) |
| Weight | 1-20 tons (depending on capacity) |
| Rated Capacity (kVA) | High Voltage (kV) | Tap Range | Low Voltage (kV) | Connection Symbol | No-load Loss (W) | Load Loss (W) | No-load Current (%) | Short Circuit Impedance (%) |
|---|---|---|---|---|---|---|---|---|
| 1250 | 1120 | 13900 | 0.60 | 6.5 | ||||
| 1600 | 1350 | 16600 | 0.60 | 6.5 | ||||
| 2000 | 1590 | 19700 | 0.55 | 6.5 | ||||
| 2500 | 1890 | 23200 | 0.55 | 6.5 |
Please contact us for complete dimensional drawings on the 1,000 kVA oil transformer, the specifications for the 630 kVA and the test reports.
Reasons to Purchase Our 35KV Oil Type Transformer
Proven Manufacturing Expertise
As a dedicated oil type transformer manufacturer, we produce certified and tested products in accordance with the relevant IEC and IEEE standards needed for use in any medium voltage utility network.
Certified Quality
Each transformer type receives full routine tests, including insulation resistance, dielectric strength and temperature rise per IEC 60076 prior to shipment.
Cost Effective
Direct from the factory manufacturing gives a better pricing on oil type transformers for bulk utility and industrial projects.
Fast Delivery
The typical delivery on a standard 35KV transformer is 6-8 weeks and accelerated production can be arranged for urgent infrastructure needs.
Certifications & Standards
IEC 60076
ISO 9001
DOE 2016
IEEE C57.12.00
CE
ISO 9001
DOE 2016
IEEE C57.12.00
CE
Buyer’s Guide
How This Oil Type Transformer Will Fit Your Project
Selection assistance for EPCs, utilities, and industrial users interested in purchasing 35KV oil-filled transformers for medium voltage distribution.
Project Applications
The 2000 to 20,000 kVA range is suitable for supporting dedicated power generation for industries with continuous processes. Renewable Energy Parks require operational support with grid connections, thus a 35KV transformer will boost the generation voltage from each generator prior to connecting to the grid. Rural Electrification projects will also benefit from the durability and reliable low maintenance of an oil transformer as access to sites may not always be secure.
Oil Type vs. Dry Type Transformers
The oil filled transformer provides superior overload and heat dissipation properties than do dry transformers. Dry-type transformers are more suited for indoor installation areas where there may be a risk of fire; however, historically liquid insulated transformer technology has been the industry standard for reliability and energy efficiency when it comes to 35KV medium voltage distribution.
Installation and Safety Issues
This transformer has many safety features, such as: pressure relief devices, Buchholz protection relays, and oil level monitoring systems, which help to provide added safety. There are also eco-friendly oil options available and systems in place for oiled transformer containment within the environment. A pad or plinth must be prepared and constructed according to local regulations and provide an unobstructed path of cooling for the ONAN cooling system to operate effectively.
Frequently Asked Questions
What is an oil type transformer?
An oil type transformer is a liquid-filled power transformer that uses insulating oil as a coolant and dielectric medium. The oil circulates through the core and coils, dissipating heat and providing electrical insulation, making it suitable for high-voltage, high-power applications.
What is the difference between dry type and oil type transformers?
Oil type transformers use insulating oil for cooling and insulation, offering higher efficiency and overload capacity for outdoor use. Dry-type transformers rely on air or resin insulation and are preferred indoors where flammability is a concern. The oil immersed design is more robust for medium-voltage networks.
What type of oil is used in transformers?
Most oil type transformers use mineral oil due to its excellent dielectric properties and cooling efficiency. Alternatives include natural ester (vegetable-based) and silicone oils, which offer higher fire points and biodegradability for environmentally sensitive installations.
How do oil transformers work?
An oil transformer operates on electromagnetic induction: the primary winding creates a magnetic field that induces voltage in the secondary winding. The insulating oil surrounds the core and coils, transferring heat away through natural convection (ONAN) or forced circulation, while also providing electrical insulation between components.
