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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: Delta Connection/ Interphase Connections

Answer: A delta connection is a term used for describing the connections used on 3 phase transformers, or 3 single phase transformers when connected to a 3 phase supply (sometimes referred to as closed delta connections). The connection used is very similar to an equilateral triangle or the symbol delta. each single phase transformer is represented by one side of the delta or equilateral triangle. The three transformers are connected together at the corners of the delta. The supply lines or load lines are also connected at the same junctions from each corner. This results in a 3 wire, 3 phase system.

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