Structured Manufacturing Data (2026)

Power Transformer

Based on aggregated insights from structured factory profiles within the CNFX directory, the standard Power Transformer used in the Electrical Equipment Manufacturing sector typically supports operational capacities ranging from standard industrial configurations to heavy-duty production requirements.

Technical Definition & Core Assembly

A canonical Power Transformer is characterized by the integration of Core and Windings (Primary & Secondary). In industrial production environments, manufacturers listed on CNFX commonly emphasize Electrical steel (silicon steel) construction to support stable, high-cycle operation across diverse manufacturing scenarios.

A static electrical device that transfers electrical energy between circuits through electromagnetic induction, typically changing voltage levels while maintaining frequency.

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Product Specifications

Technical details and manufacturing context for Power Transformer

Definition
A core component within a Power Supply System that transforms alternating current (AC) electrical energy from one voltage level to another, enabling efficient transmission, distribution, and utilization of electrical power. It provides electrical isolation between circuits and is essential for stepping up voltage for long-distance transmission and stepping down voltage for safe consumption by end-use equipment.
Working Principle
Operates on the principle of electromagnetic induction. An alternating current in the primary winding creates a varying magnetic flux in the transformer's core. This varying flux induces a voltage in the secondary winding. The voltage transformation ratio is determined by the ratio of the number of turns in the primary and secondary windings (Vp/Vs = Np/Ns).
Common Materials
Electrical steel (silicon steel), Copper or aluminum (windings), Insulating paper/oil, Transformer oil (for cooling and insulation), Steel (tank and structural parts)
Technical Parameters
  • Rated power capacity (kilovolt-ampere) (kVA) Standard Spec
Components / BOM
  • Core Part
    Provides a low-reluctance path for the magnetic flux, constructed from laminated electrical steel to minimize eddy current losses.
    Material: Electrical steel (silicon steel)
  • Windings (Primary & Secondary) Part
    Conductors wound around the core; the primary receives input power, and the secondary delivers transformed output power.
    Material: Copper or aluminum
  • Insulation System Part
    Electrically isolates the windings from each other, from the core, and from the grounded tank. Includes paper, pressboard, and insulating oil.
    Material: Insulating paper, transformer oil
  • Tank
    Houses the core, windings, and insulating oil, providing mechanical protection and serving as a container for the cooling medium.
    Material: Steel
  • Bushings
    Insulated terminals that allow electrical connections to the windings from outside the tank while maintaining a sealed environment.
    Material: Porcelain or composite polymer, copper/aluminum conductors
  • Conservator Tank (Expansion Tank)
    A separate tank connected to the main tank that allows for the expansion and contraction of the insulating oil with temperature changes, preventing air ingress.
    Material: Steel
  • Cooling Radiators/Tubes Part
    Increase the surface area for heat dissipation from the insulating oil to the surrounding air.
    Material: Steel

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Power Transformer.

industrial power transformer for electrical grids high voltage power transformer specifications copper winding power transformer efficiency transformer oil cooling system maintenance custom power transformer manufacturing process

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Power Supply System
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Programmable Power Supply
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Welding Power Source
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Programmable Power Source
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Controller / Power Supply
View system integration details

Industrial Ecosystem & Supply Chain Structure

Complementary Systems
Downstream Applications
Specialized Tooling

Application Fit & Sizing Matrix

Operational Limits
pressure: Atmospheric to 15 psi (sealed units), higher for pressurized designs
other spec: Frequency: 50/60 Hz ±5%, Humidity: 0-95% non-condensing, Altitude: ≤1000m standard
temperature: -40°C to 120°C (ambient), 65°C to 95°C (winding hot spot rise)
Media Compatibility
✓ Mineral Oil (dielectric fluid) ✓ Silicone Fluid (dielectric fluid) ✓ Dry Air (sealed dry-type transformers)
Unsuitable: Saltwater immersion or continuous salt spray environments
Sizing Data Required
  • Required Power Rating (kVA/MVA)
  • Primary/Secondary Voltage Levels (kV)
  • Impedance Percentage (%)

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Insulation Degradation
Cause: Thermal aging from prolonged overloading, moisture ingress, or contamination reducing dielectric strength.
Winding Deformation
Cause: Mechanical stress from through-fault currents, short-circuit forces, or improper transportation/handling.
Maintenance Indicators
  • Audible humming or buzzing that intensifies or changes pitch, indicating loose components or electrical issues.
  • Visible oil leaks, discoloration, or bulging of the tank, suggesting seal failures or internal pressure problems.
Engineering Tips
  • Implement regular dissolved gas analysis (DGA) and oil testing to detect early insulation breakdown and thermal faults.
  • Install and maintain proper cooling systems, ensure balanced loading, and use surge protection devices to minimize electrical and thermal stress.

Compliance & Manufacturing Standards

Reference Standards
IEC 60076 (International Electrotechnical Commission) IEEE C57.12.00 (American National Standards Institute) EN 50588-1 (European Norm, CE marking relevant)
Manufacturing Precision
  • Winding resistance: +/- 0.5% of specified value
  • No-load loss: +/- 10% of guaranteed value
Quality Inspection
  • Impulse withstand voltage test (lightning surge test)
  • Temperature rise test under rated load

Factories Producing Power Transformer

Manufacturer profiles with relevant production capability in China

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Manufacturer listings support early research and capability understanding. They are not certification, ranking, or transaction guarantees.

Technical documentation
4/5
Manufacturing capability
4/5
Inspection readiness
5/5
Supplier transparency
3/5

These scores are example evaluation dimensions, not real customer ratings, country-specific buyer feedback, or live inquiry activity.

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Frequently Asked Questions

What are the main advantages of using electrical steel in transformer cores?

Electrical steel (silicon steel) reduces energy losses through lower hysteresis and eddy current losses, improving transformer efficiency and reducing operating costs.

How does transformer oil function in power transformers?

Transformer oil serves dual purposes: it acts as an electrical insulator between live components and dissipates heat through convection cooling, maintaining optimal operating temperatures.

What factors determine the lifespan of a power transformer?

Key factors include insulation degradation, winding temperature, load cycling, maintenance frequency, and environmental conditions. Proper maintenance can extend lifespan to 30+ years.

Can I contact factories directly on CNFX?

CNFX is an open directory, not a transaction platform. Each factory profile provides direct contact information and production details to help you initiate direct inquiries with Chinese suppliers.

Data basis: CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks for Electrical Equipment Manufacturing.

Data Basis

CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks.

Preliminary Technical Classification
This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

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