Transformator Laboratory

1 / 9

# Transformator Laboratory - PowerPoint PPT Presentation

Transformator Laboratory. Ideal transformer. The winding resistance are negligibele All fluxes are confined to the core i.e no leakage flux Core losses are asumed to be negligible Permeability of the iron core is infinite Im=0. Polarity.

I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.

## PowerPoint Slideshow about ' Transformator Laboratory' - barnabas-sean

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.

- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript

### Transformator Laboratory

Ideal transformer
• The windingresistance are negligibele
• All fluxes are confined to the core i.e no leakage flux
• Core losses are asumed to be negligible
• Permeability of the iron core is infinite Im=0
Polarity
• The dot mark means that the currents entering these terminals produce fluxes in the same direction in the core. Common time varying flux linking both windings will induce a voltages in such a way that in any instance of time when terminal 1 is positive the terminal 3 will also be positive. Voltages e12 and e34 are in phase.
Practical transformer
• Leakage flux
• Core losses
Phase shift in a three phase transformer
• Phase shift can be achieved by connecting the secondary side in d-, y- or z connection.
• z-connection is achieved with the help of two identical windings on each leg of a transformer. One phase is achieved with the help of windings from two different legs.
• Phase shifts that can be achieved are even multiples of 30 degrees and that is why hour marks on a clock-face are used to indicate the phase shifts.
Laboratory exercise
• Dy-, Yy-, Dz- and Ydy connection.
• Rectified supply with a large inductance.
• BH-curve shape.
• Switch on of an unloaded transformer.
Dz10
• Practical connection.
• Phase diagram and schematic connection.