Three phase dry type transformer

Project Title

Three phase dry type transformer

Project Area of Specialization Cloud Infrastructure,Project Summary

The Distribution Transformers are important links in the chain of power distribution systems. The power, which is transmitted at high voltage, stepped down from 1100V to 415V and Phase to Neutral 415/?3 with these distribution transformers. The transformer KVA rating is 5KVA. These are manufactured in a variety of capacities and voltage ranges. Their reliable operation on the network is very critical because it directly impacts that of the entire electrical network connected to it. Dry type distribution transformers differ from oil immersed transformers mainly in cooling conditions.

"Dry type"simply means it is cooled by normal air ventilation. The dry type transformer does not require a liquid such as oil or silicone or any other liquid to cool the electrical core and coils.  The transformer case is ventilated to allow air to flow and cool the coil (coils).so it can be more economical then the oil immersed transformers

Project Objectives

Objectives:

1. Design a low cost dry type transformer
2. Learn the skills required for devlopment of Dry type transformer
3. Build a protoype implmentation fot  Dry type transformer.

Project Implementation Method

Designing steps:

• Design of core
• Window length of core
• Centre length of core
• L.T and H.T coil design
• Star-Delta connection
• Space between L.T coil and H.T coil
• Insulation paper
• Insulation Glass tape

Required Hardware :

• Core
• Insulation papers
• Coil (H.T andL.T)
• Channels
• Rods
• Insulators
• Bus bars or Connection leads

Benefits of the Project

Dry type transformer are more economical then the oil immersed transformers. These type of distribution transformers are manufactured in north America, Australia, India and many others northern areas of the world, but not in Pakistan. Even the Pakistan most popular companies PEL and SIEMENS are not producing these type of transformers. The benefit of the project is to demonstrate the local capability of developing such transformer indigenously in Pakistan. 

Technical Details of Final Deliverable

At the start of this project we have done the first 25% of the work. Completion of the designing and calculation of the main parts of transformer, including core, KVA rating, dimension of coils, copper weight and core weight etc. as: 

• The calculation of core includes Flux density of core, Area of core including its window length and center length, core type, core diameter and total weight of core has been completed
• KVA rating of the transformer have been calculated and decided.
• Coil design and dimensions includes the calculation and parameters of LT coil and HT coil has been done.
• • Other parameters that are necessary for the start of project  that have been calculated  are current density, total weight of copper material we should use in windings and length mean turns of the copper wires including LT and HT windings and also we have calculated the coil inner and outer diameter.

Final Deliverable of the Project Hardware SystemType of Industry Energy Technologies Clean TechSustainable Development Goals Decent Work and Economic GrowthRequired Resources

Item Name	Type	No. of Units	Per Unit Cost (in Rs)	Total (in Rs)
			Total in (Rs)	57000
coil	Equipment	3	12000	36000
core	Equipment	1	15000	15000
channel	Miscellaneous	2	1000	2000
protective materials	Miscellaneous	1	1000	1000
other items	Equipment	1	3000	3000