How much voltage is there in 3 phase supply?

Answer 1

It depends on the electrical standards in your country. For example, in Europe, the nominal voltages for low-voltage three-phase, four-wire, distribution systems is 400 V (line-to-line) and 230 V (line-to-neutral).

Answer 2

The line-to-line voltage (line voltage) is the square-root of 3 higher than the line-to-neutral (phase voltage) voltage. So, if the phase voltage is 220 V, then the line voltage must be 381 V.

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Common North American three phase voltages are 120/208, 277/480 and 347/600. The sq. root of three is 1.73. By applying the method in the first answer's formula - 120 (phase to neutral or ground) volts x 1.73 = 208 (phase to phase) volts. Or going the other way 208 (phase to phase voltage)/1.73 = 120 (phase to neutral or ground) volts.

Answer 3

Some valid values are 220-440-880, depending upon the service.

Answer

Three-phase system voltages are normally expressed in terms of their line voltages -i.e. the voltage between any pair of the three line (not 'phase') conductors. These values depend on (a) the voltage standards used by the country in which you live, and (b) where in the system you measure those voltages.

So, in the UK, for example, a line voltage can be as high as 400 kV (in the HV transmission system) or as low as 400 V (in the LV distribution system).

Answer 4

Dear,

the questin is not very clear..

as my understanding there are approx equal volt on each phase in three phase.

Answer

The voltage of a three-phase supply depends on (1) the national electrical standards of the country in which you live, and (2) where the three-phase system is within the overall transmission/distribution system.

Three-phase systems may be three-wire systems or four-wire systems. High-voltage transmission and distribution systems are practically always three-wire systems, whereas low-voltage distribution sytems are often (but not always) four-wire systems.

The conductors used in three-wire systems are termed line conductors (sometimes, incorrectly, called 'phase conductors'), and the voltage between any pair of line conductors is called a line voltage. For four-wire systems, three conductors are line conductors, and the fourth is called a neutral conductor -once again, the voltage between any pair of line conductors is called a line voltage, while the voltage between any line conductor and the neutral conductor is called a phase voltage.

In the UK, high-voltage transmission/distribution line voltages are 400 kV, 275 kV, 132 kV, 66 kV, and 11 kV. Low-voltage distribution line voltages are 400 V while the corresponding phase voltage is 230 V -written: 400/230 V.

Answer 5

Most buildings with a 3 phase service feed are 277/480v. That's 277 phase to ground and 480 phase to phase. This is then transformed to 120/208v.

Answer for European Systems

In Europe, the nominal low-voltage three-phase distribution systems are 400 V line-to-line (i.e. line voltages) and 230 V line-to-neutral (i.e. phase voltages).

Answer 6

US: 208 v, 480 v; UK: 415 v. The voltage quoted is between any two live wires. HIgher voltages are used for power transmission.

Another Answer

In the UK (and in Europe), the nominal three-phase line voltage is 400 V and the phase voltage is 230 V.

Answer 7

consider 380-440V for three phase power supply