| Disadvantage of cascading : |
- The disadvantage of transformer cascading is the heavy loading of primary windings for the lower stages.
- In above fig. this is indicated by the figure P, the product of current and voltage for each of the coils.
- For this three-stage cascade the output kV A rating would be 3P, and therefore each of the h.v. windings "2" would carry a current of I = P/V.
- Also, only the primary winding of transformer III is loaded with P, but this power is drawn from the exciting winding of transformer II.
- Therefore, the primary of this second stage is loaded with 2P. Finally, the full power 3P must be provided by the primary of transformer I.
- Thus an adequate dimensioning of the primary and exciting coils is necessary.
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