Method and system for computing corrosion lives of in-use steel-cored aluminum stranded wires

Abstract

The invention discloses a method for computing corrosion lives of in-use steel-cored aluminum stranded wires. The method includes determining corrosion rates of zinc and corrosion rates of aluminum in regions where the steel-cored aluminum stranded wires are located; sampling two types of old steel-cored aluminum stranded wires in the regions and respectively acquiring residual thicknesses of zinc plated layers of the two types of old steel-cored aluminum stranded wires, the depths of corrosion holes of outer-layer aluminum wires and the service lives of the two types of old steel-cored aluminum stranded wires; computing correction factors on the basis of the residual thicknesses of the zinc plated layers of the two types of old steel-cored aluminum stranded wires, the depths of the corrosion holes of the outer-layer aluminum wires and the service lives of the two types of old steel-cored aluminum stranded wires according to corrosion live computing models; measuring residual thicknesses of zinc plated layers of the in-use steel-cored aluminum stranded wires and the depths of corrosion holes of outer-layer aluminum wires; computing the corrosion lives of the in-use steel-cored aluminum stranded wires on the basis of the residual thicknesses of the zinc plated layers of the in-used steel-cored aluminum stranded wires, the depths of the corrosion holes of the outer-layer aluminum wires and the correction factors according to the corrosion life computing models.

Description

technical field [0001] The invention relates to the technical field of power transmission and transformation, and more specifically, relates to a method and system for calculating the corrosion life of aluminum-steel-cored wires in use. Background technique [0002] ACSR is one of the most commonly used wire types on transmission lines in my country. The steel-cored aluminum stranded wire is suspended on the tower through insulators. It has been affected by weather conditions such as wind, ice, snow and temperature for a long time, and is also eroded by various pollutants in the atmosphere. At present, there is no effective method to calculate the service life of the ACSR. The life of the ACSR as a conductor directly affects the safe and stable operation of the line. Therefore, it is necessary to effectively evaluate the ACSR after many years of operation. lifespan is crucial. [0003] There are many existing methods and models for calculating life, but the models are comp...

AI Technical Summary

Problems solved by technology

At present, there is no effective method to calculate the service life of the ACSR. The life of the ACSR as a conductor directly affects the safe and stable operation of the line. Therefore, it is necessary to effectively evaluate the ACSR after many years of operation. lifespan is crucial

[0003] There are many existing methods and models for calculating life, but the models are complex and the calculation methods are cumbersome; there are many methods for identifying the life of ACSR in public reports, and the most commonly used method is to collect samples in the laboratory for mechanical and electrical tests. Performance test, to identify the life of the wire through the change of some mechanical indicators; it can also be used to conduct accelerated corrosion tests in the laboratory, and use the data monitored on site to infer the life of the steel cored aluminum stranded wire

The test in the laboratory is limited by many factors, and the operability is poor; the accelerated corrosion test cannot accurately simulate the operating environment of the ACSR, not only the procedure is complicated, but the result is often inaccurate

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