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why transformer ratings are taken in 11kv 22kv 33kv but not in 10,20,30kv

ANS:These are the optimal voltages.

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Electrical Engineering Blog

1.0 Feasibility studies
1.1 Basic Engineering
1.2 Detail engineering
1.3 System studies
1.4 Load flow studies
1.5 Short circuit analysis
1.6 Transient analysis
1.7 Harmonic analysis
1.8 Motor starting analysis
1.9 Stability analysis
2.0 Equipment Sizing
2.1 Transformer Sizing
2.2 Cable sizing
2.3 Generator sizing
2.4 Battery charger-Battery sizing
2.5 UPS sizing
2.6 Panel sizing
2.6.1 Circuit breaker
2.6.2 Relay
2.6.3 Bus-bar
2.6.4 CT/PT
2.6.5 Isolator
3.0.. Caluculations
3.1 Lighting calculations
3.2 Lightning calculations
3.3 Cable sizing
3.4 Earthing calculations
3.5. Cable Tray sizing calculations

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