Quality appraisal of steel-core aluminum cables

steel core aluminum cable is based on the composite structure of high-strength steel core and conductive aluminum layer as the core principle. By optimizing the stranding process, anti-corrosion coating and interface combination technology, it achieves the synergy of mechanical strength, conductivity and corrosion resistance. It is widely used in high-voltage transmission lines, railway contact grids, cross-sea cables and large-scale engineering hoisting and other fields. In power transmission, it is used for the erection of long-span conductors; in the field of rail transit, it meets the fatigue resistance requirements of contact network load-bearing cables; in marine engineering, it ensures the salt spray resistance and tensile resistance of cables. Compared with ordinary aluminum stranded wires, steel-core aluminum cables have excellent creep resistance, vibration fatigue resistance, and light weight. They are the core material for the safe operation of power and infrastructure projects.

Zhongke Testing is a product quality appraisal service organization registered with the court. It can provide quality appraisal services for steel core aluminum cables. It has a professional appraisal team and advanced instruments and equipment to provide fair and accurate appraisal results for the quality appraisal of steel core aluminum cables.

As power grids are upgraded and engineering complexity increases, related quality dispute cases have increased significantly. The judicial dispute focuses on:

1, performance index dispute: whether the breaking force meets the standard, and the DC resistance exceeds the standard;

2, material defects: insufficient carbon content in the steel core, and the purity of the aluminum layer does not meet the standard ;

3. Process problems: out-of-control stranding pitch leads to stress concentration and uneven thickness of galvanized layer;

4. Contract performance dispute: anti-corrosion treatment process, structural parameters and technical agreement are inconsistent.

1. Appearance inspection

Conduct a visual inspection of the steel core aluminum cable to see whether the surface is smooth and free of burrs, and whether there are oxidation, rust and other defects.

2. Chemical composition analysis

Collect steel core aluminum cable samples, conduct spectrometer or chemical reagent analysis, measure the chemical composition of the steel core and aluminum wire, and verify whether it meets the standard requirements.

3. Mechanical property test

05.Other tests

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2If necessary, additional tests such as hot bending test and fatigue resistance test can be carried out to comprehensively evaluate the performance of steel core aluminum cables.

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A power company of the applicant signed a "JL/G1A-240/30 Steel Core Aluminum Stranded Wire Purchase Contract" with a cable factory of the respondent, and it was agreed that the breaking force should be ≥110kN. A disconnection accident occurred after erection. The manufacturer argued that the construction traction force exceeded the limit.

Identification analysis results:

The quality analysis expert group discussed and comprehensively analyzed the relevant information, contract technical agreements, on-site investigation case materials and other data of "Steel Core Aluminum Cable" and made the following quality analysis opinions:

The appraisal conclusion determined that material composition and workmanship defects were the main causes of the fracture.

Steel core aluminum cable quality appraisal report mainly includes the following contents:

1. Client information

2. Appraisal equipment information

3. Appraisal basis (standard, power of attorney, etc.)

4. Identification method