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66kV Oil-Immersed Transformer

Type: 3-phase oil immersed distribution transformer

Rated Power: 6300kVA–63000kVA

Frequency: 50 HZ/60 HZ

Standards: IEC 60076 / GB 1094

            

Customize from Our Standard Product Line

If you spot a near-match in our catalog, we can quickly modify our standard transformers for your application. Adjustments cover capacity, voltage class, cooling type and installation structure.

Build per Your Technical Documents

Send us your specifications or drawings. Our engineering team reviews the design, validates all key parameters with you, and manufactures strictly in accordance with international standards.

Full Custom Design from Concept to Completion

Without formal detailed specs? Share your ideas and functional requirements. We partner with you to develop fully customized transformer solutions, from electrical design and structural layout through to insulation system.

Request a Quote
  • Overview
  • Product Overview
  • Technical Advantages and Innovation
  • Why Choose Bardeen
  • Application
  • Technical Specifications
  • FAQ
  • Transportation Services & Process

Overview

Extensively used in dedicated substations for energy‑intensive sectors (steel, chemical, mining, etc.) and regional grid hub substations, it steps down voltage from 66kV to 10kV/35kV for distribution
Bardeen presents the 66kV Oil‑Immersed Transformer, a high‑performance 66kV transformer engineered to deliver reliable power conversion and distribution for modern utility, industrial, and renewable energy storage projects. As an oil‑immersed transformer designed for robust operation, this 66kV transformer integrates proven design principles with advanced insulation and cooling technology to meet the rigorous demands of grid modernization and large‑scale renewable energy storage applications.

Product Overview

Product Overview and Key Features

Product Overview and Key Features
The bardeen 66kV oil‑immersed transformer is a medium‑high voltage solution optimized for stepping voltage up or down within transmission and distribution networks. This oil‑immersed transformer features an optimized core and winding design that minimizes losses while maximizing thermal performance. The robust oil‑filled tank provides long‑term dielectric strength and efficient heat dissipation, enabling continuous operation under variable load conditions typical of grid modernization programs and renewable energy storage farms. As a 66kV transformer, it supports a wide range of system configurations and can be tailored to specific installation requirements.

Design and Construction
Constructed using high‑grade electrical steel core and precision‑wound copper or aluminum conductors, the bardeen 66kV oil‑immersed transformer emphasizes low‑noise, low‑loss performance. The oil‑immersed transformer uses advanced mineral or ester‑based insulating fluids selected for superior dielectric properties and enhanced fire safety. Mechanical design includes reinforced tanks, conservator systems, breather units, pressure‑relief devices, and multi‑tap changers where required. These design elements ensure mechanical resilience, electrical safety, and prolonged service life essential for utility‑scale grid modernization projects and renewable energy storage installations.
Thermal Management and Cooling
‑ Convection Efficiency: Efficient thermal management is a core advantage of the bardeen 66kV transformer.
‑ Insulation Protection: The oil‑immersed transformer leverages natural and forced oil circulation techniques to maintain optimal operating temperatures, reduce aging of insulation, and prevent thermal hotspots.
‑ Enhanced Heat Transfer: Enhanced cooling pathways and strategic radiator design further improve thermal exchange, making the 66kV transformer suitable for demanding environments and continuous‑duty cycles associated with renewable energy storage systems and modernized grid assets.

Electrical Performance and Reliability
‑ Low‑Loss Metrics: Electrical performance metrics for the 66kV transformer prioritize low no‑load and load losses, high short‑circuit impedance accuracy, and tight regulation.
‑ Clean Power Delivery: The oil‑immersed transformer is engineered to offer superior voltage regulation, low noise levels, and minimal harmonic distortion, ensuring compatibility with sensitive loads and inverter‑based renewable energy storage systems.
‑ Stringent Verification: Rigorous factory testing—including routine, type, and lightning impulse testing—guarantees that each 66kV transformer meets international standards and client‑specific requirements.
  • Meets distribution application requirements for the relevant voltage class and is suitable for projects across multiple overseas markets.
  • The 10000kVA capacity configuration can be matched to different power‑use scenarios based on actual load calculations.
  • Uses proven insulation and heat‑dissipation designs to enhance operational stability.
  • Supports parameter adjustments and accessory configurations to meet project requirements.
  • Suitable for export projects and can support the technical documentation and certification requirements of different markets.

Technical Advantages and Innovation

Technical Advantages and Innovation

Grid Modernization and Renewable Energy Storage Applications
The bardeen 66kV oil‑immersed transformer is ideally suited for grid modernization initiatives that require reliable voltage transformation and robust resilience against variable generation. As utilities upgrade aging infrastructure, this 66kV transformer provides a dependable backbone for higher‑efficiency distribution and improved fault tolerance.
Customization and Integration
Bardeen offers extensive customization options for the 66kV oil‑immersed transformer to meet the diverse needs of utility, industrial, and renewable energy storage customers. Configurable features include tap‑changer ranges, bushing arrangements, neutral grounding options, monitoring and communication interfaces, and secondary protection schemes. The oil‑immersed transformer can be supplied with advanced sensors and digital condition monitoring systems to support predictive maintenance strategies, optimizing uptime and reducing lifecycle costs in grid modernization deployments and renewable energy storage facilities.
Safety, Environmental, and Compliance Advantages
Safety and environmental stewardship are integral to the bardeen 66kV transformer design. The oil‑immersed transformer can be specified with biodegradable ester fluids to reduce environmental impact and improve fire safety in sensitive installations. Pressure‑relief and conservator designs, along with sealed construction options, minimize leak risk and ensure compliance with international environmental and safety standards.
Operational Benefits and Lifecycle Value
Operators and asset owners deploying the bardeen 66kV transformer will realize tangible operational benefits, including reduced energy losses, improved voltage stability, and extended maintenance intervals through robust insulation and cooling strategies. The oil‑immersed transformer’s compatibility with advanced grid control systems and renewable energy storage arrays contributes to lower total cost of ownership
Innovation and Technology Advantage
Bardeen combines decades of transformer manufacturing expertise with targeted innovations in insulation, cooling, and monitoring to deliver a next‑generation 66kV transformer solution. The oil‑immersed transformer benefits from computational design optimization, material improvements, and digital monitoring platforms that collectively enhance reliability, reduce lifecycle costs, and enable seamless integration into modern power systems.
Full Range Parameter Table
Rated Capacity - kVA High Voltage - kV Low Voltage - V Connection Group Symbol Short‑circuit Impedance - % No‑load Loss - kW Load Loss - kW No‑load Current - %
6300 66, 69 6.3, 6.6, 10.5, 11 YNd11 9 8 34 0.63
8000 66, 69 6.3, 6.6, 10.5, 11 YNd11 9 10 40 0.63
10000 66, 69 6.3, 6.6, 10.5, 11 YNd11 9 12 46 0.55
12500 66, 69 6.3, 6.6, 10.5, 11 YNd11 9 14 55 0.53
16000 66, 69 6.3, 6.6, 10.5, 11 YNd11 9 16 69 0.53
20000 66, 69 6.3, 6.6, 10.5, 11 YNd11 9 19 84 0.49
25000 66, 69 6.3, 6.6, 10.5, 11 YNd11 9 22 99 0.49
31500 66, 69 6.3, 6.6, 10.5, 11 YNd11 9 27 120 0.42
50000 66, 69 6.3, 6.6, 10.5, 11 YNd11 9 38 170 0.39
63000 66, 69 6.3, 6.6, 10.5, 11 YNd11 9 45 210 0.39

Why Choose Bardeen

Why Choose Bardeen

Why Choose Bardeen

Application

Application Scenarios

Power distribution systems for industrial plants, manufacturing facilities, and industrial parks.
Commercial buildings, public facilities, and infrastructure projects.
Supporting projects for renewable energy, photovoltaic, wind power, and energy storage.
Agricultural applications, grid expansion, and power supply for remote areas.
Overseas engineering projects and power‑infrastructure development.

Technical Specifications

Technical Specifications

Product Type Oil Immersed Transformer
Rated Capacity 10000kVA
Voltage Class 66kV
Rated Frequency 50Hz/60Hz
Number of Phases Three‑phase (subject to product configuration)
Cooling Method Subject to product type confirmation
Installation Method Outdoor or indoor installation
Applicable Standards IEC 60076 / GB 1094

FAQ

Frequently Asked Questions

Frequently Asked Questions

Transportation Services & Process

Transportation Services & Process

1. Heavy‑Lift & OOG Expertise

Specialized handling for Over‑Out‑of‑Gauge (OOG) cargo. We manage the entire process for heavy transformers, from custom crating and vacuum packaging to flat‑rack, break‑bulk, or Ro‑Ro shipping.

2. Customs & Compliance Management

Expert handling of complex export/import documentation, HS codes, and destination country regulations. We ensure smooth customs clearance to avoid costly delays.

3. Real‑Time Visibility & Risk Control

24/7 GPS tracking and milestone updates. Comprehensive cargo insurance covering all risks from origin warehouse to destination site.

4. Emergency Response

Prioritized air freight and expedited sea options for critical breakdowns. We minimize downtime by getting your replacement transformer or parts there faster.

Process

1

Assessment & Planning

We analyze the dimensions, weight, and route to design the optimal transport plan.

2

Professional Packaging

Seaworthy packing

3

Multimodal Transit

Execution of sea/air/land transport with strict handling protocols.

Need urgent after‑sales logistics support? Contact our global service team for a tailored quotation.

66kV Oil-Immersed Transformer

Type: 3-phase oil immersed distribution transformer

Rated Power: 6300kVA–63000kVA

Frequency: 50 HZ/60 HZ

Standards: IEC 60076 / GB 1094

            

Customize from Our Standard Product Line

If you spot a near-match in our catalog, we can quickly modify our standard transformers for your application. Adjustments cover capacity, voltage class, cooling type and installation structure.

Build per Your Technical Documents

Send us your specifications or drawings. Our engineering team reviews the design, validates all key parameters with you, and manufactures strictly in accordance with international standards.

Full Custom Design from Concept to Completion

Without formal detailed specs? Share your ideas and functional requirements. We partner with you to develop fully customized transformer solutions, from electrical design and structural layout through to insulation system.

Request a Quote

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