Question
Download Solution PDFWhy does Kelvin’s Law give different conductor sizes for two identical systems?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFKelvin's Law
The Kelvin's law states that the most economical size of a conductor is that for which annual interest and depreciation on the capital cost of the conductor is equal to the annual cost of energy loss.
Graphical representation of Kelvin's law:
Limitations of Kelvin's law:
- Interest and depreciation on the capital cost cannot be determined accurately.
- It gives different conductor sizes for two identical systems due to variations in interest rates, depreciation, and energy costs.
- This law does not take into account several factors like safe current carrying capacity, corona loss, etc.
- The economical size of a conductor may cause the voltage drop beyond the acceptable limits.
Last updated on Jun 7, 2025
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