In a delta to star connection of transformer one of the following is true

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ALP CBT 2 Electrician Previous Paper: Held on 22 Jan 2019 Shift 2
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  1. used for large HV transformers
  2. Used for applications where voltages need to be stepped down
  3. line voltage is equal to phase voltage
  4. Used for applications where voltages need to be stepped up

Answer (Detailed Solution Below)

Option 4 : Used for applications where voltages need to be stepped up
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Detailed Solution

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  • Delta – star connection type three-phase transformer is used for both large and low voltage rating transformers.
  • Delta – star transformer is used at the generator side to step up the voltage levels and Star – delta transformer is used at the load side of distribution systems to step down the voltage levels.
  • Star – star connection transformers are used for small, high voltage transformers.
  • Delta – delta connection transformers are used for large, low voltage transformers.

Additional InformationAs the line voltage is √3 times of the phase voltage, hence star connection is used to give the output.

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