I = Amperes E = Volts kW = Kilowatts kVA = Kilo volt-Amperes
HP = Horsepower %eff. = Percent Efficiency pf = Power Factor
برای تک فازSingle-Phase
TO FIND :
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Amperes when kVA is known –> I = kVA x 1000 / E
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Amperes when horsepower is known –> ( HP x 746) / ( E x % eff. x pf )
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Amperes when kilowatts are known –> ( kW x 1000 ) / ( E x pf )
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Kilowatts –> ( I x E x pf ) /1000
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Kilovolt-Amperes –> ( I x E ) / 1000
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Horsepower –> ( I x E x % eff. x pf ) / 746
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Watts –> E x I x pf
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Energy Efficiency –> Load Horsepower x 746 / Load Input kVA x 1000
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Power Factor @ cos θ –> Power Consumed /ApparentPower ( W / VA ) @ ( kW / kVA )
Two-Phase برای دو فاز
TO FIND :
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Amperes when kVA is known –> I = ( kVA x 1000 ) / ( E x 2 )
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Amperes when horsepower is known –> ( HP x 746) / ( E x 2 x % eff. x pf )
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Amperes when kilowatts are known –> ( kW x 1000 ) / ( E x 2 x pf )
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Kilowatts –> ( I x E x 2 x pf ) /1000
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Kilovolt-Amperes –> ( I x E x 2 ) / 1000
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Horsepower –> ( I x E x 2 x % eff. x pf ) / 746
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Watts –> E x I x 2 x pf
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Energy Efficiency –> Load Horsepower x 746 / Load Input kVA x 1000
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Power Factor @ cos θ –> Power Consumed /ApparentPower ( W / VA ) @ ( kW / kVA )
Three-Phase برای سه فاز
TO FIND :
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Amperes when kVA is known –> I = ( kVA x 1000 ) / ( E x 1.73 )
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Amperes when horsepower is known –> ( HP x 746) / ( E x 1.73 x % eff. x pf )
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Amperes when kilowatts are known –> ( kW x 1000 ) / ( E x 1.73 x pf )
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Kilowatts –> ( I x E x 1.73 x pf ) /1000
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Kilovolt-Amperes –> ( I x E x 1.73 ) / 1000
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Horsepower –> ( I x E x 1.73 x % eff. x pf ) / 746
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Watts –> E x I x 1.73 x pf
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Energy Efficiency –> Load Horsepower x 746 / Load Input kVA x 1000
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Power Factor @ cos θ –> Power Consumed /ApparentPower ( W / VA ) @ ( kW / kVA )