The ratio of the operating capacity to the available capacity of an Open-Delta connection is ___________

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NHPC JE Electrical 5 April 2022 (Shift 1) Official Paper
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  1. 0.667
  2. 0.134
  3. 0.866
  4. 0.577

Answer (Detailed Solution Below)

Option 3 : 0.866
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NHPC & THDC JE Civil Full Test 1
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Detailed Solution

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Open Delta Connection:

  • When one of the windings of a delta-connected transformer gets open, it starts working as an open delta connection.
  • An open delta connection transformer uses two single-phase transformers to provide a three-phase supply to the load. 
  • An open delta connection system is also called a V-V system.
     

Calculation:

The operating capacity of the V-V system is given by:

(kVA)Δ-Δ  = 

When one of the windings gets open, the V-V system has only two windings left.

(kVA)V-V = 2VLIL

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