Abstract
Structural elements of overhead power transmission lines are experiencing both horizontal and vertical loads. Wires and cables are elements of the overhead power line, on which changes in mechanical loads are observed to a greater degree. This occurs due to the change in the tension force of the wire/cable depending on the temperature and the formation of icy-rime deposits on it, as well as fluctuations in wind gusts. The article describes the most common systems and methods for determining the mechanical loads on an overhead power transmission line. A method is proposed for calculating the mechanical loads on an overhead transmission line based on mathematical models of a flexible wire, rope and a model for determining ice deposits on wires, taking into account the rotation of the wire/cable around its axis. A comparison of the improved inclinometry method with the method developed earlier for the case of formation of ice deposits on the S-50 cable has been carried out. A comparison was made on the error in determining the tension of the S-50 ground-wire protection cable using the method developed to control the mechanical parameters of overhead power lines, which takes into account the wire/cable rotation around its axis and the method for determining icy-rime deposits developed earlier. The developed method allows determining the elongation of the wire/cable in the span with one anchor support, as well as the strength of its tension with greater accuracy. However, additional clarification is required due to the influence of the wind, the formation of icy-rime deposits of various shapes, as well as the structural limitations of the wire/cable rotation when attaching it to the support.
Highlights
IntroductionElectrical energy is transferred from power plants or substations to the consumer via power lines (mainly overhead), which are part of the electrical system
Electrical energy is transferred from power plants or substations to the consumer via power lines, which are part of the electrical system
In practice, it is possible to use this technique based on the improved inclinometry method for the rotation angles of the wire/cable up to 180 o, which is due to structural limitations of the rotation of the wire/cable when attaching it to the support
Summary
Electrical energy is transferred from power plants or substations to the consumer via power lines (mainly overhead), which are part of the electrical system. An overhead power line is a device for transmitting electrical energy through wires located in the open air and secured with insulators and linear fittings to the supports. Lightning protection cables are used on overhead lines. The length of overhead power lines in the Russian Federation is over 2.8 million km. Due to the increase in electricity consumption and the commissioning of new sections of overhead power lines, the need for a full-fledged survey to prevent emergency situations increases. All elements of overhead power lines experience mechanical stress and can be damaged if their mechanical strength limit is exceeded. Structural elements of overhead power lines experience both horizontal (for example, mechanical stresses in a stretched wire/cable) and vertical loads
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