Customized Transformer Copper Busbars from China Suppliers - High-Quality Factory Direct Solutions
The description for transformer copper busbar:
Transformer copper busbars (also known as copper busbars) are the core conductive components for collecting and distributing current at the high and low voltage sides of a power transformer.
They are used for the safe transmission and distribution of large currents. Compared to cables, they have significant advantages such as high current carrying capacity, good heat dissipation, high mechanical strength, reliable connections, and low long-term operating losses.
They are widely applicable to oil-immersed, dry-type, box-type transformers, as well as distribution cabinets in power distribution rooms.
The Technical Specification for transformer copper busbar:
| Specific（W × T mm） | Cross-sectional area (mm²) | Current capacity (A) | Matching transformer capacity |
|---|---|---|---|
| 50×5 | 250 | 750 | 315–630 kVA（Low-voltage side） |
| 60×6 | 360 | 990 | 630–1250 kVA |
| 80×8 | 640 | 1480 | 1250–2000 kVA |
| 100×10 | 1000 | 2000 | 2000–3150 kVA |
| (Dual) 125×8 | 2000 | 3400 | 3150–5000 kVA（Low voltage High Current） |
Customization options for transformer copper busbar:
Non-standard dimensions (width 10–120 mm, thickness 3–12 mm), length (3/6m standard, zero-cut / custom length)
Special processing: bending, drilling, slotting, T-type welding, silver plating / nickel plating
Insulation treatment: segmented bushing, overall spraying
Product advantages:
Low-loss energy-saving: High-purity T2 copper, with excellent conductivity, reduces transformer temperature rise and power loss
Stable structure: Flat structure dissipates heat quickly, resistant to electric force and vibration, flat connection surface, low and stable contact resistance
Compliance and safety: Full batch material testing, in line with national standards, factory provides material report and size inspection sheet
One-stop customization: Supports drawing processing, shortens on-site installation cycle
Selection suggestions:
Based on the rated current of the transformer, the recommended current density is 2.5–3.5 A/mm² (for natural cooling), and a 10%–20% overload margin should be reserved.
The width/thickness ratio should be controlled within 10 to avoid the influence of the current skin effect.
For outdoor or humid environments, tin plating or insulation coating treatment is preferred.
For high current, parallel connection of double copper bars can be adopted.
Application scenarios for copper busbar:
Oil-immersed power transformers — High and low voltage lead-out terminals
Dry-type transformers — Low-voltage busbars, busbars within cabinets
Internal connections of box-type substations (American style / European style)
Distribution rooms — Main busbars of distribution cabinets, capacitor cabinets
Package & Shipment:
Frequently Asked Questions (FAQ)
What material grade is used for your transformer copper busbars?
Our transformer copper busbars are made from high-purity T2 copper, which offers excellent electrical conductivity (≥99.9% copper content). This ensures minimal resistive losses and optimal performance in high-current power distribution applications.
Can you produce copper busbars in non-standard dimensions?
Yes. We fully support custom dimensions. Width can range from 10 mm to 120 mm and thickness from 3 mm to 12 mm. Length options include standard 3 m or 6 m, as well as zero-cut and fully custom lengths to meet your specific project requirements.
What surface treatments are available for copper busbars used in harsh environments?
For outdoor or humid environments, we recommend tin plating or insulation coating treatment to enhance corrosion resistance and long-term reliability. Silver plating and nickel plating options are also available for applications requiring higher conductivity or wear resistance at contact points.
How do I select the right copper busbar size for my transformer?
Selection should be based on the rated current of your transformer. The recommended current density is 2.5–3.5 A/mm² under natural cooling conditions. Always reserve a 10%–20% overload margin. Also, keep the width-to-thickness ratio within 10 to minimize the skin effect. For very high current applications, a parallel double copper bar configuration is advisable.
What types of transformers are your copper busbars compatible with?
Our copper busbars are compatible with a wide range of transformer types, including oil-immersed power transformers, dry-type transformers, box-type substations (both American and European styles), and distribution cabinets in power distribution rooms.
Do you provide quality inspection reports with your copper busbars?
Yes. Every batch undergoes full material testing in compliance with national standards. We provide a complete material report and dimensional inspection sheet with each order, ensuring traceability and quality assurance for your procurement and installation processes.