why is alternating current used for transmission


Direct current (DC) is the preferred technology for moving large amounts of power across long distances. DC results in overall higher efficiency and reliability than an equivalently-sized alternating current (AC) system moving the same amount of power. More efficient: Over long distances, DC transmission can move more power with less electrical losses than an equivalent AC transmission line. Lower Cost: Higher efficiency means a lower transmission cost, helping renewable energy compete against other power sources. Improved Reliability: HVDC transmission can enhance system stability, allow the operator complete control over power flow, and facilitate the integration of wind from different resource areas. Smaller Footprint: DC transmission lines require narrower right-of-way footprints, using less land, than equivalent AC lines. The major advantage of DC power lines is their efficiency less energy is lost as it is transmitted and there is no need for reactive compensation along the line.


Because DC (Direct Current) flows steadily through the wires without changing direction many times each second and through the entire conductor rather than at the surface, DC (Direct Current) transmission lines typically lose less power than AC transmission lines.
Self-supporting suspension towers (above) are commonly used for our high voltage transmission lines across cultivated land, because the base occupies a space of only 6. 5 by 7 metres, making it less intrusive for those working the land. to 500 kV. , 138 kV, 230 kV and 500 kV. At the terminal stations located near major use centres, large transformers reduce the voltages to 66 kV, 33 kV or 24 kV. The distribution system is a network of power lines with overhead or underground conductor cables, transformer stations, transformers, voltage regulators, and oil circuit reclosers.


We deliver electricity to our customers using over 18,000 km of transmission lines and 68,000 km of distribution lines. The distribution system transforms the higher voltages to useable levels for delivery to customers. It maintains a constant supply of power and steady voltage levels despite continuously changing demands for electricity from homes, industrial sites, and commercial establishments. Energy consumption varies throughout the day and can increase by as much as 65% in Manitoba from summer to winter. is an electric current that reverses direction at regular intervals, or alternates from positive to negative, approximately 60 times a second. Most of the electricity used in the world is AC. is an electric current that flows in one direction.


For long-distance transmission, power losses are considerably less with DC than with AC. The cost of a long-distance DC transmission line system uses 2 conductor cables, where an AC system uses 3, making the DC lines approximately 1/3 less expensive. However, DC transmission requires expensive conversion equipment At a generating station, the turbine generators produce electricity. electricity through the rectification process at a converter station. DC is converted back to AC through the inversion process at another converter station. AC electricity is then transmitted through the AC network to supply customers. The development of high voltage direct current (HVDC) technology was a key factor in plans for the development of generating stations on the Nelson River.

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