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# Three-phase

In electrical engineering, three-phase electric power systems have at least three conductors carrying alternating current voltages that are offset in time by one-third of the period. [1]

## Alternating current

Alternating current (AC) is an electric current which periodically reverses direction, in contrast to direct current (DC) which flows only in one direction.

## Blondel's theorem

Blondel's theorem, named after its discoverer, French electrical engineer André Blondel, is the result of his attempt to simplify both the measurement of electrical energy and the validation of such measurements.

## Charles Proteus Steinmetz

Charles Proteus Steinmetz (born Karl August Rudolph Steinmetz, April 9, 1865 – October 26, 1923) was a German-born American mathematician and electrical engineer and professor at Union College.

## Dimensionless quantity

In dimensional analysis, a dimensionless quantity is a quantity to which no physical dimension is assigned.

## Direct current

Direct current (DC) is the unidirectional flow of electric charge.

## Electrical engineering

Electrical engineering is a professional engineering discipline that generally deals with the study and application of electricity, electronics, and electromagnetism.

## Galileo Ferraris

Galileo Ferraris (31 October 1847 – 7 February 1897) was an Italian physicist and electrical engineer, one of the pioneers of AC power system and an inventor of the three-phase induction motor.

## Harmonic

A harmonic is any member of the harmonic series, a divergent infinite series.

## Induction motor

An induction motor or asynchronous motor is an AC electric motor in which the electric current in the rotor needed to produce torque is obtained by electromagnetic induction from the magnetic field of the stator winding.

## John Hopkinson

John Hopkinson, FRS, (27 July 1849 – 27 August 1898) was a British physicist, electrical engineer, Fellow of the Royal Society and President of the IEE (now the IET) twice in 1890 and 1896.

## Kirchhoff's circuit laws

Kirchhoff's circuit laws are two equalities that deal with the current and potential difference (commonly known as voltage) in the lumped element model of electrical circuits.

## Mikhail Dolivo-Dobrovolsky

Mikhail Osipovich Dolivo-Dobrovolsky (Михаи́л О́сипович Доли́во-Доброво́льский; Michail von Dolivo-Dobrowolsky or Michail Ossipowitsch Doliwo-Dobrowolski; Michał Doliwo-Dobrowolski; &ndash) was a Polish-Russian engineer, electrician, and inventor.

## Nikola Tesla

Nikola Tesla (Никола Тесла; 10 July 1856 – 7 January 1943) was a Serbian-American inventor, electrical engineer, mechanical engineer, physicist, and futurist who is best known for his contributions to the design of the modern alternating current (AC) electricity supply system.

## Phase converter

A phase converter is a device that converts electric power provided as single phase to multiple phase or vice versa.

## Polyphase system

A polyphase system is a means of distributing alternating-current electrical power where the power transfer is constant.

## Rectifier

A rectifier is an electrical device that converts alternating current (AC), which periodically reverses direction, to direct current (DC), which flows in only one direction.

## Scott-T transformer

A Scott-T transformer (also called a Scott connection) is a type of circuit used to produce two-phase electric power (2 φ, 90 degree phase rotation) from a three-phase (3 φ, 120 degree phase rotation) source, or vice versa.

## Symmetrical components

In electrical engineering, the method of symmetrical components simplifies analysis of unbalanced three-phase power systems under both normal and abnormal conditions.

## Three-phase electric power

Three-phase electric power is a common method of alternating current electric power generation, transmission, and distribution.

## Torque

Torque, moment, or moment of force is rotational force.

## Transformer

A transformer is a static electrical device that transfers electrical energy between two or more circuits through electromagnetic induction.

## Y-Δ transform

The Y-Δ transform, also written wye-delta and also known by many other names, is a mathematical technique to simplify the analysis of an electrical network.

## References

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