High-voltage transmission lines are used to transmit electrical power over comparatively long distances, typically from a central generating station to a transmission station then to the consumer (usually a home or business). The term high voltage characterizes electrical circuits in that the voltage used is the cause of explicit safety concerns and insulation requirements. High voltage is employed in electrical power distribution, in cathode ray tubes, to generate X-rays and particle beams, to demonstrate arcing, for ignition, in photomultiplier tubes, and high power amplifier vacuum tubes and alternative industrial and scientific applications. The numerical definition of high voltage depends on the context of the discussion. 2 factors thought of within the classification of a "high voltage" are the chance of inflicting a spark in air, and also the danger of electric shock by contact or proximity. The definitions may refer either to the voltage between 2 conductors of a technique, or between any conductor and ground. So that is what is meant by a high voltage transmission line.
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