High-Strength Steel-Aluminum Conductors (ASHS)
for Overhead Power Transmission Lines
The uninsulated steel-aluminum conductor of the ASHS-type, with plastically compressed steel and aluminum components, has three main designs. Steel-aluminum conductors are manufactured according to SТО 71915393–ТУ 120–2012 and are intended for transmitting electrical energy in overhead power lines with voltages of 6–750 kV.
· The conductor is resistant to aeolian vibration for at least 100 million cycles.
· The conductor is resistant to galloping (conductor oscillation).
· The conductor is resistant to the impulse impact of a lightning strike.
· The conductor is resistant to the thermal effects of short-circuit current, occurring during operation during single-phase and two-phase ground faults, in accordance with STO 56947007-29.060.50.015-2008.
ASHS has greater mechanical strength and a larger cross-section of the aluminum part while maintaining the same diameter.
In the absence of routing restrictions, the use of our conductors can lead to a 25% project cost saving due to fewer support structures required.
Furthermore, the core design provides additional energy loss reduction.
ASHS conductors have twice the strength of standard AC conductors, surpassing AERO-Z in this parameter as well; ASHS conductor has practically the same long-term permissible current as AERO-Z; and higher current-carrying capacity than AC and AERO-Z of the same diameters.
It follows that the new ASHS conductors expand the design framework for overhead lines and make it possible to solve tasks that were previously unsolvable or whose solution was associated with significant difficulties.
A study of alternating current flow through steel-aluminum conductors of various designs showed:
The lay direction of aluminum conductors, with an even number of layers and plastic deformation, has practically no effect on heat generation in the steel core.
Changing the lay direction practically does not change the amount of heat generated or losses in the elements of the steel-aluminum conductor. The use of plastic deformation, which creates high-conductivity electrical contacts between the conductors, leads to reduced heat generation:
· in aluminum by 1%,
· in the core by 10%.
Consequently, electrical losses in ASHS-type conductors are, at a minimum, no greater than losses in AC conductors.
