Wye and Delta Electrical Configuration
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The Definition of Wye and Delta Electrical Configurations as taught in Electrical Trade Schools |
The Definition of Wye and Delta Electrical Configurations
[ad#block]Electrical Training Question: I am a graduate of an electrical trade school and have 2 yrs experience.
- I do not recall reading up on Wye & Delta wiring.
- Can you give me a small explanation of Wye and Delta.
- When I will most likely come across this type of wiring.
- Are these configurations mostly used on residential or industrial.
Background: Eddie, a Electrician from La Puente CA
Dave’s Reply:
Thanks for your electrical question Eddie.
Wye and Delta Electrical Configurations
The Wye and Delta, also described as Y-delta, Wye-delta, is a mathematical technique to simplify the analysis of an electrical network. The name is given due to the shapes of the circuit diagrams, which look respectively like the letter Y and the Greek capital letter which resembles a Triangle. In the UK the Wye diagram is also known as a star.
Because the Y and Delta is directly related to the transformation of electricity, it will also be helpful to see how this is applied at the transformer:
Using Three-Phase Transformer Connections as a Practical Example
- There are only 4 possible transformer combinations:
- Delta to Delta – used in industrial applications.
- Delta to Wye – used most common in commercial and industrial applications.
- Wye to Delta – used with high voltage transmissions.
- Wye to Wye – use is rare because it can cause harmonics and balancing problems.
- Comparatively the connections of three-phase transformers that are connected in delta or wye configurations:
The wye-delta transformer has the primary winding connected in a wye and the secondary winding is connected in a delta. - The delta-wye transformer has the primary winding connected in delta and the secondary winding is connected in a wye
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I have an MR11 lamp running on 12 volts and pulling 35 watts. I want to use a transformer with a 120 primary and secondary 12 volts and 75 watts max. Will the transformer heat up?
Hi Gerardo,
As long as the transformer is rated for the MR11 lamps that you have, there is actually 40 watts to spare so this is within the watt capacity. Keep in mind that transformers do warm up while in operation so they must be installed properly. Always use a transformer or power supply that is recommended by the manufacturer of the light fixture.
Dave