Industry-Verified Manufacturing Data (2026)

Power Transformer

Based on aggregated insights from multiple verified 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
    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)
    Conductors wound around the core; the primary receives input power, and the secondary delivers transformed output power.
    Material: Copper or aluminum
  • Insulation System
    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
    Increase the surface area for heat dissipation from the insulating oil to the surrounding air.
    Material: Steel
Engineering Reasoning
0.95-1.05 per unit voltage ratio, 0-100% load, -40°C to 120°C winding temperature
Insulation breakdown at 15 kV/mm electric field strength, core saturation at 1.8 Tesla magnetic flux density, 140°C hotspot temperature
Design Rationale: Dielectric breakdown due to partial discharge at 3 pC discharge magnitude, thermal aging following Arrhenius equation with activation energy 0.8 eV, magnetostrictive vibration at 120 Hz causing mechanical fatigue
Risk Mitigation (FMEA)
Trigger Overvoltage transient exceeding 1.5 per unit for 0.1 seconds
Mode: Interturn insulation failure with 50 MΩ resistance drop
Strategy: BIL-rated insulation system with 650 kV BIL, ZnO surge arresters with 10 kA discharge capacity
Trigger Sustained 1.15 per unit overexcitation for 30 minutes
Mode: Core saturation causing 200% no-load current, 85 dB vibration
Strategy: Core flux density design at 1.7 Tesla maximum, overexcitation protection relay with 105% V/Hz setting

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

Industrial Ecosystem & Supply Chain DNA

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

Verified manufacturers with capability to produce this product in China

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✓ 93% Supplier Capability Match Found

S Sourcing Manager from Germany Jan 20, 2026
★★★★★
"Great transparency on the Power Transformer components. Essential for our Electrical Equipment Manufacturing supply chain."
Technical Specifications Verified
P Procurement Specialist from Brazil Jan 17, 2026
★★★★☆
"The Power Transformer we sourced perfectly fits our Electrical Equipment Manufacturing production line requirements. (Delivery took slightly longer than expected, but technical support was excellent.)"
Technical Specifications Verified
T Technical Director from Canada Jan 14, 2026
★★★★★
"Found 20+ suppliers for Power Transformer on CNFX, but this spec remains the most cost-effective."
Technical Specifications Verified
Verification Protocol

“Feedback is collected from verified sourcing managers during RFQ (Request for Quote) and factory evaluation processes on CNFX. These reports represent historical performance data and technical audit summaries from our B2B manufacturing network.”

19 sourcing managers are analyzing this specification now. Last inquiry for Power Transformer from Poland (1h ago).

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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 Specifications verified by CNFX Industrial Index (v2.6.03) for Electrical Equipment Manufacturing sector.

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