Is 3 phase power equal to 3 times the single phase power?

Answer 1

Single phase has two line voltage wires, separate from each other; three phase power has three line voltage wires, actually saving more energy and thus money.

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The difference is that the power is transmitted divided into 3 parallel lines with the wave forms 120º apart. Energy saving is achieved by using very high transmission voltages hence low currents, feeding step-down Transformers in the users' locality.

Answer 2

No, it is 1.73 times more than single phase.

Single phase formula, kW = I x E x pf/1000

Three phase formula, kW = I x E x 1.73 x pf/1000

Further AnswerThe power 'supplied' by any system is dependent upon the load, not the supply or the configuration of the supply. So the simple answer is that 'it depends' entirely on the load. However, the load capacity of a three-phase system is greater than that of single-phase supply providing the same load current.

Answer 3

The horse power rating at 3 phase or single phase is alike ,what will change

is the frame type,that include the service facto.

AnswerThe output power of a motor is determined by the power of the load that it has to drive. So, if you want to replace a 5 horsepower three-phase motor with a single-phase motor, then the single-phase motor must also be 5 horsepower.

Answer 4

To show the difference in kWs a 10 HP motor will be used.

The single phase current for a 10 HP motor is listed as 50 amps at 230 volts. The formula for kWs single phase is I x E x pf/1000 = 50 x 230 x .9/1000 = 10350/1000 = 10.35 kw.

The three phase current for a 10 HP motor is listed as 28 amps at 230 volts. The formula for kWs three phase is I x E x 1.73 x pf/1000 = 28 x 230 x 1.73 x .9/1000 = 10027/1000 = 10.02 kWs.

Answer 5

Yes. You have three hot conductors as opposed to one. Size for size, that translates to three times the current. Since three phase power is generally of a higher voltage than one phase power, then power is even higher, typically six times, comparing one phase 240 against three phase 480.

Answer

Assuming that the three-phase system and the single-phase systems have line conductors with the same cross-sectional area, then a three-phase system has the capacity to provide more power than the single-phase system.

For a balanced three-phase load, the equation for power is given by:

P = 1.732 x VL IL x power factor

Assuming a single-phase load is connected across two line conductors of a three-phase supply, then the equation becomes:

P =VL IL x power factor

So, as you can see, the power supplied by a three-phase system to a balanced load, is 1.732 times that of a corresponding single-phase system.

Answer 6

In general yes. For a given physical size of motor 3 phase will be more powerful than single phase. Generally they provide more starting torgue, that is will come up to full speed under load more quickly and are less likely to stall. A common reason for chosing 3-phase motors is that since the current is spread over 3 conductors out-of-phase the wiring to them can be thinner - i.e. cheaper, though the motors and switchgear are more expensive.

Answer 7

No. Three phase motors do not consume more energy than single phase motors.

Answer

The energy consumed by any type of motor depends on its power and efficiency. If the power is the same, then the energy consumed is roughly the same -regardless of whether it is a.c. or d.c., single-phase or three-phase. The reason I say 'roughly the same', is because for a given output power (power ratings are always output power), some motors are more efficient than others, so their input power (and, hence, energy consumed) will vary. But efficiency can very between machines of the same type, as well as for different types of machine.

Answer 8

If you have the same phase voltage the power is three times as much for a 3-phase system carrying the same current, but that power can be carried with less wire, ideally only 1½ times as much wire for the 3-phase system. So 3-phase transmits power more efficiently.

Answer 9

Horse power is the same regardless of phase