Important: Use custom search function to get better results from our thousands of pages

Use " " for compulsory search eg:"electronics seminar" , use -" " for filter something eg: "electronics seminar" -"/tag/" (used for exclude results from tag pages)
Ask More Info Of  A Seminar Ask More Info Of A Project Post Reply  Follow us on Twitter
27-12-2012, 03:30 PM
Post: #1
The Design and Performance of Circular Disc, Helical and Layer Windings for Power

The Design and Performance of Circular Disc, Helical and Layer Windings for Power Transformer Applications


.pdf  The Design and Performance.pdf (Size: 2.42 MB / Downloads: 64)

INTRODUCTION

Winding design and manufacturing practices for power and distribution transformers has focused
in the differences between rectangular core and coils and layer windings common in the
production of distribution transformers and disc and helical windings and circular core designs
common in power transformers. In the small power transformer market defined as 5-15 MVA,
ONAN, with primary winding voltages up through 69 kV class, both core and coil designs are
commercially available.
Rectangular core and coils and layer windings offer the advantage of lower costs for
manufacturing compared to power class circular core and coils with disc and helical windings.
Distribution transformers are applied at lower voltages, ratings stated in KVA, lower short circuit
and thermal duties serving residential and commercial loads. Power transformers are applied at
voltages from 15 kV to 765 kV and higher, ratings stated in MVA, short circuit duties are high,
thermal loading variable and in some cases severe. Generator Step-up transformers, unit
auxiliary transformers, multiple winding transformers, autotransformers, transmission and
distribution bulk power substation service with and without load tap changing all must be
designed to withstand the rigorous duty for these power class transformer applications.

Thermal design and operation considerations

Heating of the windings results from the load losses of the winding and are a sum of the
conductor resistance losses and stray and eddy losses. Resistance losses (I2R) are a function of
load current and the resistance of the winding conductor. Stray and eddy losses include the
circulating current losses between parallel connected conductors as well as the eddy current
losses caused by the leakage flux entering the conductor, which depend on the dimension of the
conductor and direction of the flux impinging upon it.
A second function for the transformer oil is to act as a cooling system to transfer the heat
produced in the transformer windings to the cooling system through the processes of conduction,
convection and radiation. For optimum winding cooling, it is desireable that the moving oil
contact with every winding conductor for maximum convection and conduction of the conductor
heat from the winding to the mineral oil.

Through Fault - Short Circuit withstand considerations

The windings are subject to both radial and axial forces related to the current and flux
interactions. Radial forces in the inner winding (normally the LV winding) are in compression
while the outer winding (normally the HV winding) forces are in tension. Design of the
windings and bracing must consider the magnitude of these forces and provide adequate strength
to withstand them without significant mechanical deformation which could result in a dielectric
failure. The picture below is an example of a free bucking mechanical failure of an inner
winding resulting from radial forces in compression on the winding. Note, even though there is
mechanical failure, there wasn’t a dielectric failure of this winding.
Rating The Design and Performance of Circular Disc, Helical and Layer Windings for Power Options
Share The Design and Performance of Circular Disc, Helical and Layer Windings for Power To Your Friends :- Seminar Topics Bookmark
Post Reply 

Marked Categories : circular coil construction continuous disc or helical winding design, disc and helical winding design, disc verses helical windings, circular layer transformer sesign, transformer helical disc and crossover windings, helical and disc motor windings, power trnsformer helical and disc windings, helical vs disk transformer windings, power transformer winding layered, circular disc transformer design, generator transformer helical windings, circular disk windings pdf,

[-]
Quick Reply
Message
Type your reply to this message here.


Image Verification
Image Verification
(case insensitive)
Please enter the text within the image on the left in to the text box below. This process is used to prevent automated posts.

Possibly Related Threads...
Thread: Author Replies: Views: Last Post
  GRID INTERCONNECTION OF RENEWABLE ENERGY SOURCES AT THE DISTRIBUTION LEVEL WITH POWER seminar ideas 1 1,443 20-11-2014 10:28 AM
Last Post: prudhvialapati
  LUNAR SOLAR POWER GENERATION project maker 0 196 11-10-2014 11:30 AM
Last Post: project maker
  Power Quality Seminars mkaasees 0 161 10-10-2014 04:40 PM
Last Post: mkaasees
  HYBRID SOLAR POWER GENERATION SEMINAR REPORT project maker 0 202 09-10-2014 02:59 PM
Last Post: project maker
  CONDENSER IN POWER PLANT SEMINAR REPORT project maker 0 140 09-10-2014 12:19 PM
Last Post: project maker
  ppt on GREEN POWER project girl 2 2,802 08-10-2014 11:15 AM
Last Post: mkaasees
  A LabView Based Instrumentation System for a Wind-Solar Hybrid Power Station seminar ideas 2 949 08-10-2014 07:32 AM
Last Post: gauravkinng
  DESIGN CONCEPTS OF 33/11kV NEW SUBSTATION PPT project girl 3 4,481 26-09-2014 11:44 AM
Last Post: mkaasees
  POWER LINE CARRIER COMMUNICATION SEMINAR REPORT seminar code 0 207 26-09-2014 09:39 AM
Last Post: seminar code
  SURATGARH SUPER THERMAL POWER STATION SEMINAR REPORT project maker 0 139 25-09-2014 02:27 PM
Last Post: project maker
This Page May Contain What is The Design and Performance of Circular Disc, Helical and Layer Windings for Power And Latest Information/News About The Design and Performance of Circular Disc, Helical and Layer Windings for Power,If Not ...Use Search to get more info about The Design and Performance of Circular Disc, Helical and Layer Windings for Power Or Ask Here

Options: