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Encyclopedia of Marine and Energy Technology


371 results

Electric power distribution


Electric power distribution is the final stage in the delivery of electric power; it carries electricity from the transmission system to individual consumers.

Electric power industry


The electric power industry covers the generation, transmission, distribution and sale of electric power to the general public and industry.

Electric power quality


The degree to which voltage, frequency and waveform comply with established standards.

Electric power transmission


The bulk movement of electricity from one site to another.

Electric propulsion systems, electric drive systems


The concept of electric propulsion is over 100 years old with battery-powered vessels recorded in Russia and Germany around 1870. In 1893, one of the first electric boats ELECTRICITY carried passengers on the River Thames in England.

Electric shock


Electrical injury is a physiological reaction caused by electric current passing through the body. The injury depends on the density of the current, tissue resistance and duration of contact.

Electric transmission lines


The interconnected lines which facilitate the bulk movement of high voltage electricity are known as a transmission network.

Electrical admittance


Admittance is a measure of how easily a circuit or device will allow a current to flow.

Electrical arcing


An electric arc, or arc discharge, is an electrical breakdown of a gas that produces a prolonged electrical discharge.

Electrical asymmetric double line-to-ground fault


A short circuit when two lines come into contact with the ground (and each other) commonly due to storm damage.

Electrical asymmetric line-to-ground fault


A short circuit between one line and ground, very often caused by physical contact, for example due to lightning or other storm damage.

Electrical asymmetric line-to-line fault


A short circuit between lines, caused by ionization of air, or when lines come into physical contact, for example due to a broken insulator.

Electrical bolted fault


A fault where all the conductors are considered connected to ground as if by a metallic conductor. In one type of transmission line protection, a "bolted fault" is deliberately introduced to speed up operation of protective devices.

Electrical braking


Braking of a small wind turbine can be done by dumping energy from the generator into a resistor bank, converting the kinetic energy of the turbine rotation into heat.

Electrical cable


An electrical cable is an assembly of one or more wires running side by side or bundled, which is used to carry electric current.

Electrical circuit


An electrical circuit is a network consisting of a closed loop, giving a return path for the current.

Electrical conductance


Electrical conductance is the ease with which an electric current passes.

Electrical conduit


An electrical conduit is a tube used to protect and route electrical wiring in a building or structure.

Electrical connector


An electrical connector is an electromechanical device used to join electrical conductors and create an electrical circuit.

Electrical contacts


An electrical contact is an electrical circuit component found in electrical switches, relays, connectors and circuit breakers. Each contact is a piece of electrically conductive material, typically metal.

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