With this tool you can convert from HP to kVA or also kVA to HP easily, quickly and free any electric power, the calculation takes into account the power factor.
For greater ease we explain that formula is used for the calculation, some examples , how to convert from Hp to kVA in only 3 steps and a table with the main conversions from HP to kVA.
If you do not know the power factor and efficiency of the load in this section we give you the most common values: “power factor” and “efficiency”.
HP to kVA conversion formula:
- P.F=Power factor.
How to convert Hp to kVA in only 3 step:
Multiply Hp (Horsepower) by 0,746. Example, if you have 100 hp multiply by 0,746 and you get 74,6. (100×0.746=74.6).
Multiply the Power factor by the motor efficiency. For example, if the motor is an efficiency of 80% and the power factor is 0.9, it must Multiply 0.8 (80%) by 0.9 to obtain 0.72. (0.8×0.9=0.72).
Divide step 1 between step 2. Example, ((100×0.746)/(0.9×0.8) = 103,61).
Examples of conversions from Hp to kVA.
Example No 1:
A rock crusher has a power of 40Hp, a power factor of 0.86 and an efficiency of 89%, how many kVA has the rock crusher ?.
Answer: // The first step is to multiply 40 × 0.746, which will result in 29.84, then this result must be divided between the multiplication of the power factor and the efficiency, as follows: 40 × 0.746 / (0.86 × 89 %) = 38.99kVA
Example No 2:
A steel bending machine has a power of 20Hp, with a power factor of 0.82 and an efficiency of 84%, how many kVA will the steel bending machine ?.
Answer: // You must multiply the Hp by 0.746, resulting in 14.92, then multiply the power factor by the efficiency (this value must be in decimals and not in percentage, to pass it simply divides 84% among 100, which gives as result 0.84), continuing with the operation the result will be: 0.688, then you will have to divide the first result between the second, in the following way: 14.92 / 0.68 = 21.15kVA.
Example No 3:
A motor for an electric curtain has a power of 7.4Hp, a power factor of 0.88 and an efficiency of 90%, how many kVA has the motor of the curtain?
Answer: // It’s simple, you just have to enter the previous parameters to the calculator that is shown in this article and you give it to calculate, the result will be 6.97kVA.
Table Hp to kVA of conversion, equivalence, transformation (Efficiency of 85%, power factor of 0.88) :
Note : The previous conversions are made with a power factor of 0.88, and an efficiency of 85%. For different variables you should use the calculator that appears at the beginning.
Typical power factor for engines, constructions and appliances.
Typical Un-improved Power Factor by Industry:
|Oil field Pumping||0.40-0.60|
|Tool, dies, jigs industry||0.65-0.75|
Typical power factor of common household electronics:
|Electronics device||Power Factor|
|Magnavox Projection TV – standby||0,37|
|Samsung 70″ 3D Bluray||0,48|
|Digital Picture Frame||0,52|
|Magnavox Projection TV||0,58|
|Digital Picture Frame||0,6|
|Digital Picture Frame||0,62|
|Digital Picture Frame||0,65|
|Philips 52″ Projection TV||0,65|
|Digital Picture Frame||0,73|
|Sharp Aquos 3D TV||0,95|
|Element 41″ Plasma TV||0,99|
|Current large, flat-screen television||0,96|
|Windows-mount air conditioner||0,9|
|Legacy CRT-Based color television||0,7|
|Legacy flat panel computer monitor||0,64|
|While-LED lighting fixture||0,61|
|Legacy laptop power adapter||0,55|
|Fluorescent lamps (uncompensated)||0,5|
|Fluorescent lamps (compensated)||0,93|
Typical Motor Power Factors:
|(hp)||(rpm)||1/2 load||3/4 load||full load|
|0 – 5||1800||0.72||0.82||0.84|
|5 – 20||1800||0.74||0.84||0.86|
|20 – 100||1800||0.79||0.86||0.89|
|100 – 300||1800||0.81||0.88||0.91|
Reference // Power Factor in Electrical Energy Management-A. Bhatia, B.E.-2012
Power Factor Requirements for Electronic Loads in California- Brian Fortenbery,2014
Electrical motors constructed according NEMA Design B must meet the efficiencies below:
|Power||Minimum Nominal Efficiency1)|
|1 – 4||78.8|
|5 – 9||84.0|
|10 – 19||85.5|
|20 – 49||88.5|
|50 – 99||90.2|
|100 – 124||91.7|
Reference // http://www.engineeringtoolbox.com
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