Lecture

Symmetrical Three-Phase Systems

Graph Chat

Chat with Graph Search

Ask any question about EPFL courses, lectures, exercises, research, news, etc. or try the example questions below.

DISCLAIMER: The Graph Chatbot is not programmed to provide explicit or categorical answers to your questions. Rather, it transforms your questions into API requests that are distributed across the various IT services officially administered by EPFL. Its purpose is solely to collect and recommend relevant references to content that you can explore to help you answer your questions.

Description

This lecture covers the concept of symmetrical three-phase systems, including the relationship between line voltages and phase voltages, the definition of line currents, and the neutral current in symmetrical systems. It also explains the common return in symmetrical systems and the ease of studying them.

In MOOC

Electrical engineering II

This course deals with three-phase AC systems, the mainstay of industrial power supplies and certain types of electrical machines. The associated three-phase loads, whether symmetrical or asymmetrical, will be studied, along with the resulting active, reactive and apparent powers. Reactive power compensation methods will be developed. This course also deals with transient regimes, induced by the switching on, switching off or failure of circuits on their source, whether DC or AC. The importance of studyin

Official source

Quiz

Ontological neighbourhood

Electrical engineering

Power engineering: Electric power transmission

Related concepts (28)

Three-phase electric power

Three-phase electric power (abbreviated 3φ) is a common type of alternating current (AC) used in electricity generation, transmission, and distribution. It is a type of polyphase system employing three wires (or four including an optional neutral return wire) and is the most common method used by electrical grids worldwide to transfer power. Three-phase electrical power was developed in the 1880s by several people. In three-phase power, the voltage on each wire is 120 degrees phase shifted relative to each of the other wires.

Single-phase electric power

In electrical engineering, single-phase electric power (abbreviated 1φ) is 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 rotating magnetic field; single-phase motors need additional circuits for starting (capacitor start motor), and such motors are uncommon above 10 kW in rating.

Phasor

In physics and engineering, a phasor (a portmanteau of phase vector) is a complex number representing a sinusoidal function whose amplitude (A), angular frequency (ω), and initial phase (θ) are time-invariant. It is related to a more general concept called analytic representation, which decomposes a sinusoid into the product of a complex constant and a factor depending on time and frequency. The complex constant, which depends on amplitude and phase, is known as a phasor, or complex amplitude, and (in older texts) sinor or even complexor.

Phase converter

A phase converter is a device that converts electric power provided as single phase to multiple phase or vice versa. The majority of phase converters are used to produce three-phase electric power from a single-phase source, thus allowing the operation of three-phase equipment at a site that only has single-phase electrical service. Phase converters are used where three-phase service is not available from the utility provider or is too costly to install.

Split-phase electric power

A split-phase or single-phase three-wire system is a type of single-phase electric power distribution. It is the alternating current (AC) equivalent of the original Edison Machine Works three-wire direct-current system. Its primary advantage is that, for a given capacity of a distribution system, it saves conductor material over a single-ended single-phase system, while only requiring a single phase on the supply side of the distribution transformer. This system is common in North America for residential and light commercial applications.

Related lectures (40)

Three-Phase Sinusoidal Circuits

Covers the efficiency and weight/power ratio of three-phase alternators and symmetrical three-phase systems.

Apparent and True Power: Transformer

Explains apparent and true power in circuits, power factor, transformers without load resistors, and transformers with load resistors.

Symmetrical Three-Phase Systems

Explains the generation of symmetrical three-phase systems and the calculation of active, reactive, and apparent power.

Telegrapher's Equations: Solutions and Examples

Explores time-domain solutions for lossless lines and examples of wave propagation behavior.

Star or Triangle Connection MOOC: Electrical engineering II