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Is the kva rating of a three phase generator per phase or a total of the three phases example is a 3 phase 75 kva generator 25 kva per phase or 75 per phase?
The kV.A (not 'kva') rating is the total apparent power of the machine. So a 75 kV.A machine is 25 kV.A per phase.
How can you convert single phase transformer into three phase transformer?
In order to convert from single phase to three phase, you need an inverter or some kind of motor-generator. Variable Frequency Drives for electric motor speed control now feature single phase input with three phase output for motor loads up to 3HP. Good for the home shop where you got a deal on some equipment but lack 3 phase power. For instance, Google this: ATV12H075F1
Why is 3 phase more efficient?
There are a few reasons. In my opinion the most common is cost. In an industrial setting, three phase power is used to power motor loads. A three phase induction motor is more efficient than a single/split phase motor. They also have higher starting torque. A three phase load will also typically have a lower amp rating for the same size load as single phase. This saves money because you can use smaller wire.
Why would electric cost more on a three phase system as compared to a two phase system?
Three phase electricity, per watt delivered, is cheaper than single phase. This is because you can deliver the power to an electrical appliance over three "power lines" instead of one. For example, if you tried to operate a 5 hp ac electric motor on single phase it would require 3730 watts for continuous operation and quite a bit more for start up. A 12 gauge standard wire is only rated for 2700 watts. The more current that runs thru a wire the hotter it gets. The hotter it gets the more the resistance (ohms) goes up. Resistance in a wire is pure waste in terms of electrical cost since you are paying to convert electricity to heat. The same motor run on 12 gauge 3-phase wiring would only deliver 1243 watts per electric line to run the 5 hp motor. Also for motor use, three phase is much smoother and "torquier" than single phase since the power pulses to the field magnets is matched far better than in the single phase. For a visual on this see the website description below: = Wikipedia: Three-phase electric power =
Can transformer develop three phase power from a single phase source?
To do this, you will need to phase shift the single phase power supply into three distinct phases that are 120 degrees out of sync with each other. Phase shifting transformers can be used for this, but there might be other ways as well.
How much current per phase will a 18KW motor draw on 415 v?
To calculate the current per phase, use the formula: Current (I) = Power (P) / (Square Root(3) x Voltage (V)). For an 18kW motor at 415V, the current per phase will be: 18,000W / (1.732 x 415V) ≈ 24.5A per phase.
How do you calculate 3 phase power for a motor that draws 22 amps per leg it is a 480 3 phase motor do you use 480 x 22 or 277 x 22?
1.73*480*22
How to Calculate three phase watts with unbalanced phase current?
You will need to determine the power per phase, and add them up to give the total power of the three-phase load. To do this, you will need to multiply the phase-voltage by the phase current by the power factor -for each phase.
How many amp does a 40 hp motor draw at 440 volts?
At 440 volts, a 40 hp motor pulls about 68 amperes. Well, sort of...The definition of a horsepower for an electric motor is 746 watts. Multiply 746 by 40, and divide by 440, and you do get 68 amperes.1hp=746Whence, 40hp=29840Wgiven that the motor draws 440voltsbut current = power/voltage.therefore, current=29840/440 = 67.81818182 amps.The complexity, however, is that a motor is an inductive load and it has reactance. This reactance will change the phase angle between voltage and current, causing current to lag voltage by some amount. Power factor is a measure of the ratio of apparent power to true power, and is essentially the cosine of the phase angle between voltage and current. This power factor will make the true power be higher than the apparent power, but horsepower is based on apparent power.Bottom line is that the amperes in this case will be dependent on the power factor, perhaps about 75 amperes, maybe.Also, such a motor is bound to be a three phase motor. The amperes will be spread out among the three phases so, for 68 amperes, it would be about 23 amperes per phase, and for 75 amperes, it would be about 25 amperes per phase.In terms of power factor, it might be closer to unity than anticipated, if the motor has power factor correction capacitors installed.Keep in mind that starting current will be much higher than running current. Also note that large motors of this type would typically be started in wye configuration, so as to present lower voltage across the windings, and then run in delta configuration, for full power operation.I'm going to stick with about 25 amperes per phase, full power run mode, unless someone else has something to add, of course.CommentAn added complication is that '40 hp' refers to the output power of the motor. Unless you know the efficiency, you cannot work out the input power. Incidentally, 68 A single phase doesn't work out at 25 A per line for a 3-phase motor!!!!! It works out a little over 39 Aper line, because P = (root 3) x U x I x power factor!
What you basically want is will each phase take 26 Amps current for 15HP 3 phase 415VAC motor?
Yes, for a 15HP 3-phase 415V AC motor, each phase will draw approximately 26 Amps of current when running under normal operating conditions. This results in a total current draw of 26 Amps per phase for the motor.
Is the kva rating of a three phase generator per phase or a total of the three phases example is a 3 phase 75 kva generator 25 kva per phase or 75 per phase?
The kV.A (not 'kva') rating is the total apparent power of the machine. So a 75 kV.A machine is 25 kV.A per phase.
Is amp draw on a 220V motor per leg or combined?
Amp draw is always combined. 220V is uncertain if it is three phase or not, because there are both one phase and three phase applications of the 220V motor. In any case, the answer is always "combined".
What is the formula for calculating the full load current of 300 HP motor?
One horsepower electric is defined as 746 watts, so 300 horsepower is 224 KW. You don't say what the power factor is, so lets assume 0.85. Divide 224 KW by 0.85, and you get 263 KVA. You are running three phase, no doubt, so divide by 3 to get 88 KVA per winding. Lets assume 480 three phase delta, so divide by 480 to get 183 amperes per winding. Finally, look at motor efficiency. Lets assume 0.95, giving 192 amperes per winding. To translate between winding current and phase current in balanced three phase delta, multiply by the square root of 3, giving a phase current of 333 amperes per phase. That's a lot of current, requiring very large windings and conductors, and it would be a very large motor. I would use a motor with a higher voltage, perhaps 4160. This would bring the current down to around 22 amperes per winding, or 38 amperes per phase, a more reasonable value for such a large motor.
What is low range power in motor vehicles?
Low range power is the power your motor makes in the low range of rpms( revolutions per minute).
How can you convert single phase transformer into three phase transformer?
In order to convert from single phase to three phase, you need an inverter or some kind of motor-generator. Variable Frequency Drives for electric motor speed control now feature single phase input with three phase output for motor loads up to 3HP. Good for the home shop where you got a deal on some equipment but lack 3 phase power. For instance, Google this: ATV12H075F1
Why is 3 phase more efficient?
There are a few reasons. In my opinion the most common is cost. In an industrial setting, three phase power is used to power motor loads. A three phase induction motor is more efficient than a single/split phase motor. They also have higher starting torque. A three phase load will also typically have a lower amp rating for the same size load as single phase. This saves money because you can use smaller wire.
Why would electric cost more on a three phase system as compared to a two phase system?
Three phase electricity, per watt delivered, is cheaper than single phase. This is because you can deliver the power to an electrical appliance over three "power lines" instead of one. For example, if you tried to operate a 5 hp ac electric motor on single phase it would require 3730 watts for continuous operation and quite a bit more for start up. A 12 gauge standard wire is only rated for 2700 watts. The more current that runs thru a wire the hotter it gets. The hotter it gets the more the resistance (ohms) goes up. Resistance in a wire is pure waste in terms of electrical cost since you are paying to convert electricity to heat. The same motor run on 12 gauge 3-phase wiring would only deliver 1243 watts per electric line to run the 5 hp motor. Also for motor use, three phase is much smoother and "torquier" than single phase since the power pulses to the field magnets is matched far better than in the single phase. For a visual on this see the website description below: = Wikipedia: Three-phase electric power =
