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How do you calculate the power consumption of 3 phase 2.2 kW induction motor drawing 3A current at 400 volts and 0.9 PF?
Wiki User
∙ 9y ago
The power consumed can be calculated directly from the current draw, voltage, and power factor: (3A) x (400v line to line) x (sqrt(3)) x (.9pf) = 1.87kW. This would be a reasonable value for a 3hp motor that is not running under full load (the motor may be slightly over-sized for this application). The size of the motor is irrelevant to this calculation, although it shows that it is running at ~85% of its capability.
Another Answer
Since a motor is a balanced load, we use the following equation to find its input power:
power = 1.732 x line voltage x line current x power factor.
So, in your example,
power = 1.732 x 400 x 3 x 0.9 = 1870 W
Obviously, it cannot be delivering 2200 W when its input is just 1870 W. However, to determine its output power you will need to determine its efficiency at that input.
Wiki User
∙ 9y ago
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What is the advantage of the capacitor-start induction-run motor over the resistance-start induction-run motor?
A capacitor-start system will limit the current drawn by an induction machine by correcting the devices poor power factor during the start up. This limits the current needed to start the device without using any real power. A resistance-start system will limit the starting current by drawing current unto the resistor instead of the induction machine. The real power used by the resistor is turned into heat and lost. A capacitive-start system will use no real power and will not create excess heat, it will be more expensive to initially purchase.
What happens if induction motor is started with full supply voltage applied to it without any starter?
(single-phase assumed). It will probably just sit and buzz, drawing the starting current. But give it a spin and it will start up in either direction.
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Yes. In almost all cases, the current follows the voltage waveform. The peak amplitude of the current depends on the device or appliance that's drawing the current.
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General assembly drawing. General Arrangement Drawing
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As the lamps are identical, and all three draw a current of 6 A, then each lamp must be drawing 2 A. So, with one of the lamps disconnected, the current drawn from the supply will reduce to 4 A.
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Power = Voltage x Current. So it will be 60W of power consumption, in your case.
What is the advantage of the capacitor-start induction-run motor over the resistance-start induction-run motor?
A capacitor-start system will limit the current drawn by an induction machine by correcting the devices poor power factor during the start up. This limits the current needed to start the device without using any real power. A resistance-start system will limit the starting current by drawing current unto the resistor instead of the induction machine. The real power used by the resistor is turned into heat and lost. A capacitive-start system will use no real power and will not create excess heat, it will be more expensive to initially purchase.
Does a increase in current result in increase in electrical consumption?
As you are billed on the consumption of wattage and wattage is the product of amp times volts the answer to your question is yes. An increase in current will result in an increase in electrical consumption.Additional AnswerResidential consumers are billed on their energyconsumption (there is no such thing as 'electrical consumption' as 'electricity' is not a measurable quantity!), expressed in kilowatt hours.There may be several reasons for an increase in load current. For example, if the residential load has a low power factor, it will be drawing more current than necessary, but the energy consumed will be no different from if the load had a high power factor.So, for residential loads, an increase in load current doesn't necessarily mean a higher energy consumption.
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Leading or drawing; persuasive; tempting; -- usually followed by to., Tending to induce or cause., Leading to inferences; proceeding by, derived from, or using, induction; as, inductive reasoning., Operating by induction; as, an inductive electrical machine., Facilitating induction; susceptible of being acted upon by induction; as certain substances have a great inductive capacity.
What happens if induction motor is started with full supply voltage applied to it without any starter?
(single-phase assumed). It will probably just sit and buzz, drawing the starting current. But give it a spin and it will start up in either direction.
What is the meaning of inductive?
Leading or drawing; persuasive; tempting; -- usually followed by to., Tending to induce or cause., Leading to inferences; proceeding by, derived from, or using, induction; as, inductive reasoning., Operating by induction; as, an inductive electrical machine., Facilitating induction; susceptible of being acted upon by induction; as certain substances have a great inductive capacity.
How to calculate the magnitude of the tension of a string?
Calculate the magnitude of the tension in a string by drawing a free body diagram, and then using the formula T = mg + ma.You can calculate the magnitude of the tension in a string by first drawing a Free body diagram, and then using the formula T = mg + ma.
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