Enhancing Power Systems with Three-Phase Transformers

Transformers
By Asma Jlassi | 15/07/2022

Three-Phase Transformer for Power Transmission

Three-phase power transformers are of a prime position in energy distribution networks in power systems that require efficient distribution capacity and high-power transmission capabilities. At higher power ratings, three-phase transformers are less expensive, lighter, and smaller since they use less wiring compared to three single-phase transformer types. They are ideal for industrial equipment and offer many benefits for multiple applications.   


Challenges of Modeling Three-Phase Transformers 

The design of transformer systems is a challenging endeavor, especially for high-power applications. During the design process, the following aspects need to be taken into consideration: 

  • Steady-state and transient magnetic analyses 
  • Winding configurations and connections (delta or star) 
  • Compute winding properties (AC and DC resistance and inductances, etc.) 
  • Open and short circuit tests 
  • Extracting the transformer equivalent circuit 
  • Core design and material investigation 
  • Electromagnetic loss calculation (hysteresis, eddy, and winding loss) 
  • Heat distribution and mechanical deformation 
  • Electric field analysis and insulation failures 


EMWorks Solution for Transformer Power Systems 

Transformer maintenance and repair is expensive. Therefore, the simulation and validation of all performance aspects of a transformer can save your money, time, and effort.  

From geometry modeling to finite element simulation of its electromagnetic behavior, EMWorks tools provide a full solution for transformer devices: 

TransformerWizard: is an EMWorks 3D CAD tool  for transformer designs, fully integrated inside your CAD platform and allows you to get, with few clicks, various pre-defined transformer templates for single and three-phase configurations.

  


Electromagnetic simulation: The popular 2D and 3D  low-frequency software packages from EMWorks, EMS and EMWorks2D, are the preferred simulation platforms for many transformer designers and manufacturers; they addresses all aspects of a transformer design allowing an accurate and efficient computation of electromagnetic fields and multi-physics analysis. 

The figures below show some of the obtained 2D and 3D results of a three-phase transformer design: 



On Load Circuit with Resistive Load -∆Y Transformer Connection



Magnetic Flux Density Animation Versus Phase



Current Curves Versus Time



Total Core  Loss Curve



Steady State Temperature Distribution Across the Transformer 



Core Deformation under EM and Thermal Load Effects


Three-phase transformers stand as pivotal components in the realm of power transmission, offering a blend of efficiency, cost-effectiveness, and compact design vital for high-power distribution networks. The design journey of these transformers entails intricate considerations from magnetic analyses to heat distribution challenges. EMWorks' suite of tools, from TransformerWizard to EMS and EMWorks2D, provides an integrated solution, streamlining the design process and addressing the multifaceted aspects of transformer design, ensuring reliability and performance in power systems.