Difference between 3 phase and single phase elctricity

[Sam_321]

Does anyone know the difference between 3 phase and single phase elctricity on normal houses?

What are the advantages and disadvantages of both?

Thanks!

 

[Nalindax]

If you use high wattage equipments like motors, heaters etc regularly your normal 2 phase connection maybe not enough.you may feel some power problemsdue to that.
if you purchase 3 phase connection i guess you have to pay more per unit rather than other domestic connection.cuz your connection is listed as in industrial bunch.

 

[chirantha7777]

Does anyone know the difference between 3 phase and single phase elctricity on normal houses?

What are the advantages and disadvantages of both?

Thanks!

There is three phase and single phase.. Our electricity system works at 50Hz (50 AC cycles per second) when you get a three phase line the these cycles are synchronized.... first phase gets power, then second phase gets power, then third..... But they all operate at 50Hz... (Not 50/3) this synced power when given to a THREE PHASE motor (a motor that has three separate coils) causes it to spin faster because of the way the power is delivered to it (one after the other). It also means the resistance (coils inside the motor cause resistance) is also less because 1/3 of the resistance is applied to a phase... it improves the factor known as efficiency in the motor their by reducing power consumption.

You can also use three phase lines in houses to get more power.... You house wiring would need to be split into 3 sections... then you can draw a total of 30A X 3 from various places in the house. Normally devices above 30A (6900W) would be designed to work on a three phase line. Any how you won't be able to get more than 30A from a single socket in the house anyway.

Note that you must never join two phase lines to one line... this will cause a ripple effect and cause the AC cycles to combine... providing a 150Hz cycle rate which will damage your devices

 

[Sam_321]

Thanks Chirantha!

 

[Suryaa]

simple explanation
Three Phase ....normally used for bigger loads....like Motors, High capacity Heaters etc.
Single Phase... Lighting, home appliances, and all loads of power less than 2500W,
but if ur load is more than that...u need to go for 3 phase power supply connection.

 

[Suryaa]

simple explanation
Three Phase ....normally used for bigger loads....like Motors, High capacity Heaters etc.
Single Phase... Lighting, home appliances, and all loads of power less than 2500W,
but if ur load is more than that...u need to go for 3 phase power supply connection.

 

[Suryaa]

In electrical engineering, single-phase electric power refers to the distribution of alternating current electric power using a system in which all the voltages of the supply vary in unison. Single-phase distribution is used when loads are mostly lighting and heating, with few large electric motors. A single-phase supply connected to an alternating current electric motor does not produce a revolving magnetic field; single-phase motors need additional circuits for starting, and such motors are uncommon above 10 or 20 kW in rating.
In contrast, in a three-phase system, the currents in each conductor reach their peak instantaneous values sequentially, not simultaneously; in each cycle of the power frequency, first one, then the second, then the third current reaches its maximum value. The waveforms of the three supply conductors are offset from one another in time (delayed in phase) by one-third of their period.
Standard frequencies of single-phase power systems are either 50 or 60 Hz. Special single-phase traction power networks may operate at 16.67 Hz or other frequencies to power electric railways.