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Standards published by IEEE and CIGRÉ cover the following subjects, necessary to perform DLR: on conductors and thermal ratings: thermal behavior of overhead conductors (TB207), rating of overhead conductors (TB299, TB601), thermal modelling of overhead conductors (IEEE738) on dynamic line-rating specifically (TB498)
An overhead power line is a structure used in electric power transmission and distribution to transmit electrical energy along large distances. It consists of one or more conductors (commonly multiples of three) suspended by towers or poles.
The following is a list of spans, either used for overhead line crossings of rivers, sea straits or valleys, as antenna or for aerial tramways. This list is incomplete ; you can help by adding missing items .
The National Electrical Safety Code (NESC) or ANSI Standard C2 is a United States standard of the safe installation, operation, and maintenance of electric power and communication utility systems including power substations, power and communication overhead lines, and power and communication underground lines.
In North America, overhead distribution systems may be three phase, four wire, with a neutral conductor. Rural distribution system may have long runs of one phase conductor and a neutral. [ 17 ] In other countries or in extreme rural areas the neutral wire is connected to the ground to use that as a return (single-wire earth return).
An optical ground wire (also known as an OPGW or, in the IEEE standard, an optical fiber composite overhead ground wire) is a type of cable that is used in overhead power lines. Such cable combines the functions of grounding and communications .
Conductors are transposed in overhead power lines to reduce transmission losses. Unlike in cables, continuous transposition is impractical, so it is done at a specialized transposition tower. A transposing structure may be a standard structure with special cross arms or maybe a dead-end structure.
Termination tower (overhead line to underground cable) Future termination tower of a 110 kV-line while joins are installed. A special kind of a dead-end tower is a termination pylon, also called a terminal tower. It is used when the overhead power line terminates, and is connected to substation equipment, or transitions to underground cable.