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Shri Surinder Mehta being honoured with the Padma Shri by Her Excellency Smt. Pratibha Patil, President of India at Rashtrapati Bhavan on 31st March, 2009.


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Design
 
PML design team has taken the technology and training from world famous “VIT” which is a part of “Electrozavod” one of the largest Power Transformer manufacturer in the world.
 
VIT Headquarter, Ukraine

VIT Headquarter   VIT Headquarter
Training given by VIT specialist to PML Personnel at Nellore

    
    
 
PML offers power transformers incorporating most modern technologies meeting its customers’ expectations and relevant standards at the lowest possible cost. An array of software programs are employed to arrive at the optimum design and calculate the expected behavior of the transformer at test and in service from all aspects. Our 3-D CAD engineering system allows us to review the complete internal and external design of a transformer before assembly eliminating errors and defects at production stage.

Design Optimization
Best feasible design is selected by varying flux density, winding current densities, core height, CRGO grade, conductor type etc. Current distribution in windings, magnetic flux distribution in core, Impedances, Optimum places for transposition, load loss, no-load loss, sound level, hydraulic calculation of cooling system, heating of core and windings etc. are calculated and verified to be within acceptable limits.

      


Impulse voltage distribution
The non-linear distribution of impulse voltages in windings is calculated to determine the stresses arising across insulation gaps, in tap changer contacts and transferred to other windings. Windings are designed minimizing this non-linearity by shielding or interleaving conductors. Impact of external circuit elements like lightning arresters is considered.

   
 
Electrostatic field analysis
Our engineers use 2-D electric field solutions to verify adequacy of insulation in along windings, between windings and from windings to earth to withstand dielectric tests and perform reliably at site conditions.

   
       
Short circuit forces
High dynamic and thermal short circuit withstand capability is a hallmark of a high-quality transformer. We calculate currents in all windings under short circuit test conditions as well as all possible kinds of faults possible at the site. Electromagnetic forces resulting from these forces can cause failure of the transformer in many ways. Strength of the winding conductors, insulation arrangement and the clamping structure to withstand these forces with no effect on the transformer performance is ensured by detailed analysis. Windings are dimensioned such that axial oscillations do not lead to resonant behavior.

  
 
2-D magnetic field
A program for solution of plane and axisymmetric magnetic field is used for calculation of losses in and heating of metallic structures due to high current leads.

    
 
Stray losses
Method of integral equations is used to estimate losses occurring in yoke beams, flitch plates, tank etc. Effect of current carrying leads, wall shunts and yoke shunts is considered.

   
 
Structural Design
Structural analysis is performed to study and predict the behavior of transformer structures like Pressure Rings, Yoke beams and Tank. The primary goal of structural analysis is the computation of deformations, internal forces, and stresses in the various regions of the transformer and to ensure robust construction and safe operation withstanding static and dynamic stresses.


    
 
 

 
 
 
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Power Transformer
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CMD


  Shri Surinder Mehta,
  The Founder Chairman
  Chairman's Message-


 

 
 
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