Description
As a professional transformer manufacturer and supplier, we provide IEC-compliant 33kV oil immersed transformers designed for high-voltage power transmission and distribution in utility, industrial, and energy projects. Our factory-direct supply ensures stable quality, flexible capacity customization, competitive pricing, and reliable delivery for global B2B customers.
Introduction to 33kV Oil Immersed Transformer
Notre 33kV oil-immersed transformer serves as a critical component in contemporary power systems. Designed for primary distribution across substations, mining operations, and heavy industries, it offers an optimal blend of durability, reliability, and modern engineering. Each element is constructed for resilience, delivering stable performance under demanding conditions.
The transformer combines rugged construction with advanced design. It features efficient ONAN/ONAF cooling, a sealed tank to prevent contamination, and high-quality materials that ensure lasting efficiency and operational integrity. Suitable for renewable energy integration, grid expansion, or large industrial power supply, this unit provides a dependable solution tailored to evolving energy needs.
Design Details of Oil-Immersed Transformers
This detailed breakdown showcases the premium components that define our 33kV transformer’s quality:
Oil Level Gauge
Our transformer features a precision oil level gauge for continuous visual monitoring of insulating oil. As the oil is essential for cooling and insulation, maintaining proper levels is crucial for safety and performance. The gauge provides a clear, fog-resistant display that withstands environmental factors, simplifying inspections and reducing maintenance downtime while extending transformer life.
On-Load Tap Changer (OLTC)
The OLTC maintains voltage stability under varying grid conditions by adjusting the turns ratio without interrupting power supply. This ensures consistent output voltage, protecting connected equipment in areas with frequent load changes. Constructed with robust mechanics and advanced switching technology, the OLTC offers durability, minimal contact wear, and reliable operation through numerous cycles.
Silicon Steel Core
The core is constructed from high-grade, grain-oriented silicon steel to minimize core losses and improve energy efficiency. Its innovative lamination design reduces eddy current and hysteresis losses, resulting in quieter operation and lower lifetime operating costs. This design meets international energy efficiency standards.
Lifting Lugs
Heavy-duty lifting lugs are positioned to balance the transformer’s weight during handling. Tested to support the full unit weight, they enable safe and efficient transportation, unloading, and installation, reducing movement-related risks and streamlining deployment.
High-Voltage Bushing (33kV Input)
Designed with high-strength porcelain, these bushings offer superior dielectric and mechanical performance for 33kV input connections. Resistant to moisture, pollution, and environmental stress, they ensure reliable operation and reduce the risk of insulation failure or partial discharge.
Low-Voltage Bushing (400V/11kV Output)
These output bushings provide secure connections for 400V or 11kV applications. Built with enhanced insulation and mechanical durability, they resist thermal cycling, vibration, and load variations, delivering safe and stable performance for end-users.
Technical Specifications: 33kV Oil Immersed Power Transformer
| Rated Power (kVA) | Rated Voltage | Loss (W) | On Load Current (%) | Oil Weight (kg) | Total Weight (kg) | Dimension (L*W*H mm) | ||
|---|---|---|---|---|---|---|---|---|
| H.V (kV) | L.V (V) | No Load | On Load | |||||
| 30 | 3.3 / 6.0 / 6.3 6.6 / 10 / 11 13.2 / 13.8 / 15 20 / 22 / 24 30 / 33 / 35 / 36 | 380 / 400 415 / 433 / 440 | 100 | 600 | 2.1 | 75 | 305 | 750*500*990 |
| 500 | 680 | 5100 | 1.2 | 260 | 1645 | 1365*765*1540 | ||
| 1600 | 1640 | 14500 | 0.8 | 550 | 4175 | 1975*1175*1900 | ||
* Custom specifications for 33kV oil-immersed transformers are available upon request. Please contact our technical team for detailed drawings.
33kv Oil lmmersed Power Transformer Key Features & Functions
As a direct manufacturer and supplier, we provide reliable 33kV oil immersed transformers for global power projects.
Factory-Engineered Voltage Transformation
As a professional 33kV oil immersed transformer manufacturer, we design and produce transformers that deliver accurate voltage step-up or step-down for medium-voltage distribution systems. Our factory-engineered solutions ensure stable power supply for utility, industrial, and renewable energy projects.
Manufacturer-Controlled Oil Cooling and Insulation
We use certified insulating oil and optimized internal structures to achieve efficient cooling and high insulation performance. Strict material selection and process control at our factory ensure consistent quality and safe operation under continuous and heavy load conditions.
High-Capacity Design for Project Applications
Notre 33kV oil immersed transformers are designed to handle rated load and short-term overload in demanding power projects. We supply solutions suitable for substations, industrial plants, and large-scale renewable energy installations.
Supplier-Tested Structure for Outdoor Installation
Each transformer is manufactured with a sealed steel tank and anti-corrosion coating for outdoor use. As a reliable transformer supplier, we test mechanical strength and environmental resistance before delivery to ensure long-term field performance.
Low-Loss Manufacturing for Energy Efficiency
We optimize core design and winding configuration to reduce no-load and load losses. Our manufacturing process focuses on improving energy efficiency and lowering operating costs for project owners.
Customized Supply Based on Project Requirements
We provide customized 33kV oil immersed transformer solutions, including voltage ratio, capacity, vector group, cooling method, and protection options. Our engineering team supports EPC contractors with technical clarification and tailored designs.
Supplier Responsibility from Production to Delivery
From design and manufacturing to factory testing and delivery, we manage the full supply process. This ensures consistent quality, clear documentation, and smooth integration into your power system.
Manufacturing & Factory Tour: 33kV Oil Filled Transformer
Behind every reliable transformer is a world-class manufacturing process. Our factory is equipped with advanced technology, including automated CNC winding machines, vacuum drying ovens, and impulse voltage testers.
Our dedicated team of engineers and technicians oversees every step of production, from core assembly to final testing, ensuring each 33kV oil-immersed transformer meets the highest international standards of quality, safety, and performance. We combine engineering expertise with manufacturing excellence to deliver products you can trust.
Applications of 33kV Oil Immersed Power Transformer
Notre 33kV oil-immersed transformers are trusted by clients worldwide to power critical infrastructure. Our proven track record includes diverse and demanding projects:
Australia
We supply heavy-duty transformers for remote mining operations, designed to withstand extreme temperatures, dust, and rugged terrain. Our units ensure reliable power for large-scale extraction and processing sites, helping mining companies achieve greater operational efficiency and safety.
Indonesia
In partnership with local utilities, we deliver transformers that enhance grid stability in tropical climates with high humidity and load fluctuations. Our solutions support reliable power distribution across urban and remote areas, contributing to Indonesia’s sustainable energy infrastructure.
Peru
We provide high-efficiency transformers for industrial, commercial, and infrastructure projects in the Peru. Featuring advanced cooling and robust insulation, our products perform reliably in desert heat, supporting the country’s vision for modern, energy-efficient cities.
Türkiye
Our transformers power manufacturing plants and commercial complexes, offering high efficiency, low losses, and long service life in compliance with European and regional standards. We support Türkiye’s industrial growth and energy modernization efforts.
Global Reliability
From Australia’s outback to Southeast Asia’s tropics and the Middle East’s deserts, our transformers adapt to diverse environments and grid requirements. We are a trusted global partner for reliable, efficient, and durable power solutions.
Why Choose Us？
Professional 33kV Transformer Manufacturer
We specialize in the design and manufacturing of 33kV oil immersed transformers for medium-voltage distribution systems. With extensive project experience, we support utility, industrial, and renewable energy applications with stable and compliant transformer solutions.
Engineered for Reliability and Long Service Life
Notre 33kV oil immersed transformers use high-quality silicon steel cores, premium copper windings, and certified insulating oil to ensure low loss, efficient cooling, and long-term operational stability. Each unit is designed to perform reliably under continuous load and demanding outdoor conditions.
Customized Solutions for EPC and Power Projects
We provide flexible customization based on project requirements, including rated capacity, voltage ratio, vector group, cooling method, and protection level. Our technical team works closely with EPC contractors to deliver optimized transformer configurations that match local grid standards.
Compliance with International Standards
All 33kV oil immersed transformers are manufactured and tested according to IEC 60076 or ANSI/IEEE standards. Strict factory testing ensures electrical safety, performance consistency, and smooth integration into global power systems.
Factory Direct Supply with Cost Efficiency
As a direct manufacturer and supplier, we eliminate unnecessary intermediaries to offer competitive pricing and stable delivery schedules. This factory-direct model helps project owners reduce procurement costs without compromising transformer quality.
Technical Support from Selection to Commissioning
We support your project at every stage, from transformer selection and technical clarification to documentation and installation guidance. Our responsive engineering team helps minimize project risks and ensures smooth commissioning.
Proven Performance in Global Projects
Notre 33kV oil immersed transformers have been successfully deployed in substations, industrial facilities, and renewable energy projects worldwide. Proven field performance makes us a trusted long-term partner for power infrastructure development.
Certifications
Coopération mondiale
We believe in working closely with you throughout the entire project lifecycle—from initial consultation and custom design to installation support and after-sales service. Our team diligently understands your unique needs and consistently ensures your complete satisfaction.
Consequently, clients perceive us not merely as a supplier but rather recognize us as a trusted partner in power.
Looking for a reliable 33kV oil immersed transformer supplier?
FAQ
1. What is a 33kV transformer?
Distribution networks use 33kV transformers to step down voltage. They also apply these units to step up electrical levels. Substations widely install this medium-voltage equipment. Industrial plants actively employ 33kV transformers. Renewable energy projects integrate them into power systems. Utility grids rely on these transformers for stable operation. A 33kV oil immersed transformer uses insulating oil for cooling and electrical insulation, ensuring stable operation under high load and harsh environments.
2. What is the difference between a 33kV and an 11kV transformer?
The main difference between a 33kV and an 11kV transformer lies in their voltage level, application scope, and system position. A 33kV transformer is typically used in primary or sub-transmission distribution systems, while an 11kV transformer is mainly used for secondary distribution closer to end users. 33kV transformers handle higher power capacity, longer transmission distances, and higher insulation requirements than 11kV transformers.
3.How do I choose the right 33kV oil immersed transformer for my project?
Choosing the right 33kV oil immersed transformer starts with defining your rated capacity, primary and secondary voltage, and load characteristics. You should also consider installation conditions, cooling method, grid standards, and future load expansion. As an experienced 33kV transformer manufacturer and supplier, we support EPC contractors and project owners with technical evaluation, model selection, and customized solutions to ensure reliable and cost-effective power distribution.
4.Where is a 33kV oil immersed transformer commonly used?
Power substations widely use 33kV oil-immersed transformers. Industrial plants also employ this equipment extensively. Mining projects rely on these transformers for operations. Renewable energy systems utilize them actively. Solar power stations integrate these transformers efficiently. Wind power stations depend on their stable performance.
Engineers design these transformers for specific applications. Medium-voltage distribution networks require continuous operation. The transformers deliver high reliability consistently. They maintain stable performance under heavy loads. Electrical systems achieve efficient power distribution. These transformers are especially suitable for outdoor installations in utility and infrastructure projects.
5.What are the advantages of a 33kV oil immersed transformer?
A 33kV oil immersed transformer offers superior cooling efficiency, high insulation strength, and excellent overload capacity compared with dry-type transformers. The insulating oil effectively dissipates heat and protects internal components, ensuring long service life and stable operation. This makes the 33kV oil immersed transformer a reliable and economical choice for outdoor, high-load, and long-term power distribution projects.
6.What capacity options are available for 33kV oil immersed transformers?
33kV oil immersed transformers are available in a wide range of capacities, typically from a few MVA up to tens of MVA. Common ratings include 5MVA, 10MVA, 20MVA, and customized capacities based on project requirements and grid standards.
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