Question: 9. What type of 3-phase connection requires only two transformers? 10. An installation requires a capacity of 86 KVA The utility company intends to

9. What type of 3-phase connection requires only two transformers? 10. An installation requires a capacity of 86 KVA The utility company intends to set two transformers as an open delta to supply this installation. What is the minimum KVA capacity of each transformer? 11. Why do most 3-phase transformer connections have at least one side (primary or secondary) connected in delta? 12. What type of 3-phase connection requires overcurrent protection in only two of the three phases? 13. List some of the protective relays found with large transformers. 14. What material should be available before opening manholes on large transformers? 15. Why is it important to inventory tools and equipment before and after working inside a transformer? 16. What are the two major types of 3-phase connections? 17. In what type of 3-phase connection are the line current and phase current the same? 18. In what type of 3-phase connection are the line voltage and phase voltage the same?

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9 The type of 3phase connection that requires only two transformers is known as a ScottT or Scott connection This connection is used when a threephase system ... View full answer

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