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Frequently Asked Questions

This section is for informational purposes only and should not be used as a design tool or to generate technical specifications. For further details, please contact CTI and discuss with a representative for clarification. Search for terms or questions by entering words or phrases in the text box and clicking Search, by selecting a category from the drop-down list and clicking Show. Then simply click on the linked term or question below.

Question: Scott T Connected Transformer

Answer: Scott T connection of transformers is a method used for changing 3 phase to 2 phase or vice versa. The name originates from the man who developed it. This connection consists of two transformers: one with a center tap called the main and one with an 86.6% tap called the teaser. The teaser is connected to the center tap of the main, and the start and finish of the main and 86.6% tap are all connected to the 3 wires of a 3 phase supply. The secondary on the teaser and the secondary on the main each produce a voltage which is 90 degrees electrically from each other. These two voltages make up the 2 phase. There are other connections used to obtain 2 phase from 3 phase and vice versa, but the Scott T connection is the most economical. Phase changing transformers can be built in auto types as well as isolating types.

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