Three phase delta transformers

In summary, the transformer winding does not create a short circuit. Instead, it transforms the load impedance in proportion to the consumer load. With no load, the primary winding presents as a high impedance, resulting in minimal current flow. Additionally, the vectorial sum of the two phases is always equal to the third phase. The winding diagram on a power transformer's nameplate also represents the angular relationships of the windings.
  • #1
traijan
15
0
Dumb question - if the phases are tied together in a three phase delta transformer why don't the phases short out against each other in the same way the transmission lines would fault phase to phase if the touched each other in the overhead? I think I understand the wye winding situation in which the current vectors cancel each other out. Is that same in this case? Thanks
 
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  • #2
The transformer winding is not a short circuit. The winding transforms the load impedance, in the ratio N2, so electrically the winding presents as an impedance proportional to the consumer load.

With no secondary load, the transformer primary winding is seen as a high impedance and very little current flows.
 
  • #3
Also - note at any given time the Vectorial SUM of the 2 phases is = to the Third. Not a dumb question - and you were on the right track with the Y reference. -- It is interesting to note that the nameplate on a power transformer will have a winding diagram - if this diagram is done properly, the diagram also represents the angular relationships of the windings.
 

What is a three phase delta transformer?

A three phase delta transformer is a type of electrical transformer that is used to convert high voltage three phase power to a lower voltage. It is commonly used in industrial and commercial settings.

How does a three phase delta transformer work?

A three phase delta transformer has three primary and three secondary windings that are connected in the shape of a delta. When three phase power is applied to the primary windings, it creates a magnetic flux which induces a current in the secondary windings, resulting in a lower voltage output.

What are the advantages of using a three phase delta transformer?

One of the main advantages of using a three phase delta transformer is that it allows for higher power transfer with less energy loss compared to single phase transformers. It is also more compact and cost-effective than other types of three phase transformers.

What are the common applications of three phase delta transformers?

Three phase delta transformers are commonly used in industrial and commercial settings for powering large motors, pumps, and other heavy machinery. They are also used in power distribution systems for buildings, hospitals, and other facilities.

What are the safety precautions when working with three phase delta transformers?

When working with three phase delta transformers, it is important to follow proper safety precautions, such as wearing appropriate personal protective equipment and ensuring the transformer is properly grounded. It is also important to have a thorough understanding of the electrical system and working with high voltage equipment before attempting to work with these transformers.

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