Dry Transformer Core

The dry-type transformer core (dry-type transformer core) is the core magnetic circuit component of a dry-type transformer. It is made by stacking or winding high-permeability silicon steel sheets and does not require insulating oil for cooling. It relies on air or resin insulation for heat dissipation. Its design focuses on low loss, low temperature rise and high mechanical strength, and is suitable for places with high fire protection requirements and environmental sensitivity (such as high-rise buildings, subways, data centers, etc.).

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.

Overview
Product Overview
Performance Advantages
Applications
Application
Why Choose Bardeen
Technical Specifications
FAQ
Transportation Services & Process

Overview

Bardeen presents the dry transformer core, a robust and efficient solution engineered for modern power systems that demand reliability, safety, and adaptability. The dry transformer core is designed to meet the evolving needs of grid operators, industrial facilities, and renewable energy projects, providing a compact, low-maintenance alternative to oil-filled equipment

Product Overview

Core Features and Design Principles

The dry transformer core leverages high-grade silicon steel laminations and optimized core stacking techniques to minimize core losses and reduce audible noise. The core geometry and material selection are tailored to deliver low Magnetostriction and stable flux distribution under variable load cycles

Winding arrangements incorporate epoxy or resin-coated coils with high thermal class insulation systems that enhance dielectric strength and moisture resistance

Performance Advantages

Efficiency and loss reduction are central to the dry transformer core performance profile. Carefully engineered core lamination and precision assembly reduce hysteresis and eddy current losses, improving no-load and load efficiencies. The dry transformer core exhibits superior thermal performance through enhanced heat dissipation pathways and convection-optimized enclosures, enabling higher temperature rise tolerances and extended service life of insulation materials

Safety and Environmental Benefits

One of the most significant advantages of the dry transformer core is its environmentally friendly and safer operational profile:

Eliminating liquid dielectrics reduces the risk of leakage, fire, and soil contamination
The solid insulation design of the dry transformer core aligns with strict environmental regulations and facilitates deployment in sensitive or constrained urban, industrial, and renewable energy storage sites
Reduced maintenance intervals and elimination of oil handling lower the total lifecycle environmental footprint and operational costs

Applications

Applications Across Power Systems

The dry transformer core is exceptionally suited to a wide array of applications. For grid modernization projects, the dry transformer core provides a compact and resilient solution for upgrading distribution networks and enhancing local reliability. In renewable energy storage and grid automation applications, the dry transformer core supports bidirectional power flows and frequent cycling, offering dependable service at inverter and energy storage interfaces

Manufacturing, Standards, and Testing

Bardeen applies stringent production methodologies to the dry transformer core, drawing on decades of transformer manufacturing expertise. Each dry transformer core undergoes comprehensive factory testing, including routine and type tests aligned with IEC 220kV transformer standards where applicable:

Validated for dielectric strength, temperature rise, short-circuit withstand, and impulse performance
Manufacturing quality management ensures traceability of materials, meticulous assembly tolerances, and consistent electrical characteristics
Offered with configurable options for specific project requirements, including varying kVA ratings, enclosure protection levels, and terminal configurations

Technical Innovations

Customization and Field Support

Understanding that each project presents unique challenges, Bardeen offers tailored configurations of the dry transformer core. Customers can request specific voltage ratios, vector groups, and mounting solutions to suit substation layouts, rooftop installations, or containerized renewable energy storage systems. Bardeen provides technical support from project planning through commissioning and offers optional on-site testing and training. The integration of the dry transformer core into grid modernization initiatives, alongside renewable energy storage setups certified to IEC 220kV transformer guidelines, provides a complete and reliable energy management solution

Application

Application Scenarios

Grid modernization distribution network upgrade projects

Renewable energy storage & inverter interface applications

Industrial & urban sites for fire safety and environmental protection requirements

Substation, rooftop and containerized energy storage installations

Grid automation with bidirectional power flow operation

Why Choose Bardeen

Bardeen Dry Transformer Core adopts high-grade grain-oriented silicon steel laminations and precision stacking process, featuring low loss, low noise and stable magnetic flux distribution. With solid resin insulation design, it eliminates oil leakage and fire hazards, ideal for urban, industrial and battery energy storage projects. Full factory type test to meet IEC standards, customizable to match your transformer design

· Low magnetostriction design to cut noise and core loss
· Vacuum resin impregnation for void-free, moisture-resistant insulation
· Pass dielectric, temperature rise, short-circuit and impulse tests
· Support custom voltage ratio, vector group, kVA and terminal layout
· Compatible with thermal monitoring for smart grid asset management

Technical Specifications

Product Name	Dry Transformer Core
Material	High-grade grain-oriented silicon steel laminations
Key Feature	Low core loss, low audible noise, low magnetostriction
Insulation Type	Epoxy / resin coated, solid dry-type insulation
Applicable Standard	IEC 220kV related transformer standards
Advantages	No liquid dielectric, fire safe, no leakage, low maintenance
Customization	Voltage ratio, vector group, kVA rating, terminal configuration

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

Assessment & Planning

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

Professional Packaging

Seaworthy packing