To use or not to use a three phase system is determined by the electrical design engineers for the project. The determination is made on the size of the connected load and the availability of the voltage needed by the equipment to operate. Using higher voltages to keep overall construction costs down usually dictates that a three phase system be used.
3 Phase system is for industrial use and 1 phase is for house hold application
A 3 phase system needs only to use 3 or 4 conductors, as against 6 conductors if it were 3, single phase conductors The amount of copper used in a 3 phase is much less than what would be needed in a single phase system carrying the same current, this reduction in copper allows for weight reduction and cost savings. The power losses in a 3 phase system are much less than in a single phase system.
i think its use for 3 phase connection.
3 phase system has more power than a single phase system
A two-phase a.c. system is an archaic system, in which two phase voltages are generated 90 electrical degrees apart. It has nothing whatsoever to do with the US 'split phase' system that supplies North American homes. A two-phase system can be a four-wire system, or a three-wire system, and was useful because, unlike a single-phase system, it could create naturally rotating magnetic fields in induction motors. It has long been superseded by the three-phase system.
By having a transformer with 3 phase input and single phase out put
No, because household electrical systems are only comprised of a single phase.
A 3-phase 3-wire system provides a single-phase supply between any two wires. On a 3-phase 4-wire system with one line out but the neutral intact, the system is described as a faulty 3-phase system but it would allow a 3-phase motor to start, but not run properly. True 2-phase systems with the voltages in quadrature (90 degrees or one quarter cycle apart) were used in the 19th century but not since then because 3-phase was found to be better.
To calculate the kVA for a 3-phase system, you can use the formula: kVA = √3 × Voltage × Current / 1000. For a 3-phase system with a line voltage of 400V and a current of 100A, the calculation would be: kVA = √3 × 400V × 100A / 1000 ≈ 69.28 kVA. Therefore, the system is approximately 69.28 kVA.
Single phase connection has 1 phase wire and a neutral wire. Another wire for protective earth. In three phase system, motor can be connected in star or delta. Most AC induction motors are in Delta. Power distribution system is generally 3 phase 4 wire. Transmission system is 3 phase high voltage. Industry uses 3 phase system, where as 1 phase is for domestic, commercial applications. Both 1 and 3 phase system has a frequency. It is either 50 Hz or 60 Hz, depending upon the country or region.
For the info. of everybody..... the 3-phase system is definitely use in large commercial & industrial plant that uses large equipment/apparatus, like motors powered by more than 230v supply. However, single-phase system was commonly used in residential, which uses 230V or 110V equipment/apparatus, also considered as light load.... Daryll Jan of Sorsogon City, Philippines (10yrs. old, Grade V) POWER OF 3 PHASE SYS = 3 TIMES OF THE POWER FOR 1 PHASE SYSTEM
Yes, as long as you use only one phase of the 3 phase system. If R & Y gives 460 volts, use R & Y. This not a good approach though.