Oil Immersed Transformer 66kV 20000kVA

Overview

Bardeen 66kV 20000kVA Oil Immersed Transformer

Built for major receiving points, the 66kV 20000kVA oil immersed transformer transfers a substantial block of power from a sub-transmission network into a plant or regional distribution system. This capacity class is considered where the consequences of poor system coordination, restricted transport access, or inadequate thermal planning are significant. The transformer can therefore be developed in close reference to the network model, load forecast, civil works, switching philosophy, transport envelope, site assembly plan, and remote supervision requirements

Product Overview

The Oil Immersed Transformer 66kV 20000kVA integrates a resilient core and winding assembly tailored for high-performance operation at 66 kilovolts. This 66kV oil immersed transformer uses high-grade silicon steel laminations, precision-wound copper or aluminum conductors, and optimally segmented coils to minimize losses and control hot-spot temperatures

Key Project‑Oriented Points:
‑ The 20MVA capacity supports major load centers and reduces dependence on numerous small transformation stages.
‑ Network calculations can be reflected in the voltage ratio, tapping provision, impedance, and winding connection selected for the unit.
‑ Mechanical strength, insulation coordination, and heat‑removal arrangements are addressed for high‑capacity service conditions

Optional System Interfaces & Site Engineering:
‑ Comprehensive indication, alarm, protection, and remote‑monitoring interfaces may be incorporated for centralized operation.
‑ Shipping splits, handling points, oil processing, and site reassembly requirements can be planned during the engineering phase.

Central to the design of the 66kV oil immersed transformer is its oil-immersed cooling and insulation system. The oil functions as both a dielectric medium and a thermal transfer agent, ensuring the 20000kVA power transformer maintains consistent operating temperatures under variable load cycles

Product overview and core features:

The Oil Immersed Transformer 66kV 20000kVA integrates a resilient core and winding assembly tailored for high-performance operation at 66 kilovolts. This 66kV oil immersed transformer uses high-grade silicon steel laminations, precision-wound copper or aluminum conductors, and optimally segmented coils to minimize losses and control hot-spot temperatures

Technical Design, Customization & Lifecycle

Thermal management and dielectric medium:

Central to the design of the 66kV oil immersed transformer is its oil-immersed cooling and insulation system. The oil functions as both a dielectric medium and a thermal transfer agent, ensuring the 20000kVA power transformer maintains consistent operating temperatures under variable load cycles

Mechanical design and environmental resilience:
The mechanical architecture of the Oil Immersed Transformer 66kV 20000kVA emphasizes structural integrity and seismic resilience. The tank and internal bracing are engineered to withstand transportation and site handling stresses while maintaining precise clearances required for 66kV operation. Corrosion-resistant coatings, high-quality gaskets, and breather systems improve longevity in harsh environments

Electrical performance and efficiency:
The 20000kVA power transformer demonstrates low no‑load and load losses due to optimized core stacking and conductor configuration. The 66kV oil immersed transformer features tightly controlled magnetic flux paths and precise winding geometry to reduce stray losses and noise. This results in improved efficiency across a range of loads, lowering lifecycle operating costs when used as a grid‑scale energy storage transformer or integrated into a high‑voltage substation transformer scheme

Protection, monitoring and accessories:
Modern grid applications demand smart monitoring, and the Oil Immersed Transformer 66kV 20000kVA is equipped for condition‑based maintenance. Optional on‑load tap changers, Buchholz relays, pressure relief devices, temperature sensors, and dissolved gas analysis ports are integrated as standard or optional features

Applications and adaptability:
The 66kV oil immersed transformer is suitable for a wide array of applications. As a 20000kVA power transformer, it supports high‑demand distribution feeders, industrial complexes, and centralized power generation interconnections. When paired with battery systems or renewable generation, this grid‑scale energy storage transformer becomes an essential component in energy storage facilities, smoothing intermittency and enabling grid services. In high‑voltage substation transformer roles, the unit acts as a reliable step‑up or step‑down transformer, ensuring secure power transfer across transmission and distribution interfaces

Customization and compliance:
Bardeen manufactures the Oil Immersed Transformer 66kV 20000kVA with production lines compliant with IEC standards up to 220kV, guaranteeing that the 66kV oil immersed transformer and the 20000kVA power transformer meet stringent quality and safety benchmarks. Customers can specify insulating oil types, bushing configurations, secondary connection arrangements, and mounting options

Innovation and technical advantages:
Bardeen leverages advanced design simulation and material selection to deliver a 66kV oil immersed transformer offering superior efficiency and operational flexibility. The 20000kVA power transformer benefits from optimized cooling pathways, modular accessory integration, and advanced monitoring interfaces that reduce downtime and provide actionable insights. For grid operators, the grid‑scale energy storage transformer application provides reliable charge/discharge handling and compatibility with power conversion systems

Applications

Heavy‑Industry Complex — Steel, metallurgical, and large mineral‑processing complexes

Petrochemical & Refinery — Petrochemical plants, refineries, and integrated process sites

Large‑Scale Data Campus — High‑capacity data‑center and technology campuses

Utility Receiving Substation — Utility receiving substations serving regional distribution networks

Renewable Energy Hub — Large renewable‑generation interconnections and energy hubs

Why Choose Bardeen

The Oil Immersed Transformer 66kV 20000kVA from bardeen is a high‑performance 66kV oil immersed transformer and 20000kVA power transformer engineered for modern electrical networks. It is well‑suited as a grid‑scale energy storage transformer or as a high‑voltage substation transformer, combining durability, efficiency, and customizable features with IEC‑compliant manufacturing and comprehensive lifecycle support

Technical Specifications

Product Type	Oil Immersed Transformer
Rated Capacity	20000kVA
Voltage Class	66kV
Rated Frequency	50Hz/60Hz
Number of Phases	Three‑phase - subject to product configuration
Cooling Method	ONAN / ONAF / Optional OFAF
Installation Method	Outdoor or indoor installation
Applicable Standards	IEC 60076 / GB 1094

FAQ

Frequently Asked Questions

Q1: Are your transformer accessories (tanks, cores, radiators) suitable for non‑standard transformer models? Do you support customisation based on drawingsA1: Absolutely. We are not only a manufacturer but also a provider of customised solutions. Whether you provide hand‑drawn sketches, used part samples, or PDF drawings, our technical team can produce precise CAD production drawings for you. For cores, we can tailor the stacking scheme of grain‑oriented silicon steel sheets according to your loss requirements; for tanks, we can adjust wall thickness and reinforcement structures based on insulation class

Q2: How do you ensure that the cores or clamping frames you produce match the performance of my original transformer designA2: We implement full‑process quality traceability. For cores, we strictly test flux density and specific loss to ensure they meet or even exceed national standards. For clamping frames (clamps), we pay special attention to punching position accuracy and galvanising/anti‑corrosion treatment, and provide CMM (coordinate measuring machine) inspection reports for critical dimensions, ensuring seamless installation upon receipt

Q3: What materials are used for the transformer tanks and radiators? How do you prevent rustingA3: We conventionally use high‑quality cold‑rolled steel plates (Q235B or Q345R). For rust prevention, we perform strict shot‑blasting to remove mill scale, followed by epoxy coal tar paint or polyurethane topcoat, with a dry film thickness strictly controlled above 120μm. For radiators (fin‑type radiators), we place special emphasis on internal pickling and Phosphating treatment to ensure that the transformer oil is not contaminated during circulation

Q4: Are the silicon steel sheets for the cores imported or domestic? Are the clamping frames strong enoughA4: We offer two options – Baowu Steel and Nippon Steel – to suit different budget requirements. For clamping frames (clamps), we use high‑strength steel formed in one stamping process, followed by vibration ageing treatment to relieve internal stress. This ensures that the clamps do not deform during a transformer short circuit, firmly securing the core

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.