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To convert the rating of a machine from horsepower (HP) to kilovolt-amps (kVA), you need to use the formula that relates these two units of measurement through the efficiency and power factor of the machine. The general formula for calculating kVA when horsepower is given is as follows:
[ text{kVA} = frac{text{HP} times 0.746}{text{Efficiency} times text{Power Factor}} ]
Where:
– HP is the horsepower
– 0.746 is the conversion factor from horsepower to kilowatts (kW) (since 1 HP = 0.746 kW)
– Efficiency is the machine’s efficiency, which should be expressed as a decimal (for instance, 90% efficiency would be 0.9)
– Power Factor is the power factor of the machine, also expressed as a decimal.
This formula takes into account that horsepower is a unit of power representing the engine’s output, while kVA is a unit that combines both the real power (in kW) and reactive power (in kVAR), considering the power factor and efficiency of the machine or electrical system.
c
Explanation: The horse power rating of the machine along with the efficiency and power
factor is calculated. On substitution the kVA input can be obtained