Rare earth aluminum alloy conductors are a new type of conductor manufactured by smelting pure aluminum with multiple trace metal elements, followed by sophisticated processes including special annealing and compact pressing. Their production imposes stringent requirements on manufacturing equipment and technical expertise.
I. What Are Rare Earth Elements and Their Advantages?
Rare earth aluminum alloy cables are manufactured using self-developed rare earth aluminum alloy rods with fully independent intellectual property rights. The conductor rods are produced by adding rare earth elements to electrolytic aluminum, which play a vital role in the alloy. Rare earth elements boost electrical conductivity, improve hot workability, ductility, creep resistance, and high-temperature corrosion resistance.
Our products are widely applied in state power grids and other power supply networks, wind power generation, photovoltaic power generation, expressways, schools, hospitals, government projects, municipal works, industrial and mining enterprises, street lighting, large commercial complexes, civil buildings and other fields.
II. Why Promote the Use of Rare Earth Aluminum Alloy Cables?
The promotion is driven by inherent risks of pure aluminum cables, drawbacks of copper cables, and unique merits of aluminum alloy cables:
Drawbacks of pure aluminum cables, mainly poor compressive creep resistance and low ductility, lead to three major hazards during long-term operation: (1) Gaps form at cable joints, increasing contact resistance and deteriorating electrical performance; (2) Terminal detachment causes electric leakage risks, or poor contact generates sparks and triggers fires; (3) The cable is fragile under bending and prone to breakage. Even if unbroken, cracks emerge at bent sections, raising resistance and resulting in overheating.
Copper cables have three prominent disadvantages: (1) High copper prices push up overall project investment costs; (2) Copper resources are increasingly scarce, with most supplies relying on imports; (3) Copper cables are heavy and inflexible, leading to high construction costs.
Aluminum alloy cables resolve the above defects of pure aluminum and copper cables, while featuring three core strengths: (1) Excellent corrosion resistance and extended service life; (2) Superior anti-creep performance, good flexibility and low springback; (3) Free of heavy metals, delivering higher energy efficiency and environmental friendliness.
III. Official Opinions of National Authorities on Rare Earth Aluminum Alloy Cables
From the perspective of national energy strategy, the National Energy Administration attaches great importance to the research, development and popularization of rare earth aluminum alloy cables in China. It takes the lead in formulating industrial standards for aluminum alloy cables and conducts technical appraisals on outstanding domestic manufacturers of rare earth aluminum alloy cables.
The Ministry of Housing and Urban-Rural Development prioritizes the application of aluminum alloy cables in the construction sector. It evaluates qualified domestic manufacturers and issues official Certificates, which generally specify applicable scenarios including power transmission and distribution projects for industrial and civil buildings, wind farms, etc.
State Grid Corporation of China highly values the research and practical deployment of rare earth aluminum alloy cables. It has issued dedicated documents to recognize aluminum alloy cables, adopted such cables in numerous projects, and launched trials for their application in high-voltage power transmission.
IV. Mandatory Qualifications for Rare Earth Aluminum Alloy Cable Manufacturers
Official appraisal, evaluation or certification issued by national competent authorities including the National Energy Administration, Ministry of Housing and Urban-Rural Development or equivalent regulatory bodies. Only manufacturers accredited by national authorities can guarantee reliable product quality — this criterion is especially critical for medium and large-scale projects when selecting cable suppliers.
Official product test reports issued by nationally recognized authoritative testing institutions, covering three categories: (1) Three fundamental mandatory test reports: Test Report on Conductivity and Chemical Composition of Aluminum Alloys, Compressive Creep Test Report of Conductors, and 1000-Thermal-Cycle Test Report of Transition Terminals. These represent the basic technical prerequisites for aluminum alloy cable production. (2) Type test reports from national authoritative testing institutions, as well as fire resistance or flame retardancy test reports from the National Fire Testing Center, which are provided based on customers’ specified cable models. (3) Full-performance test reports conducted by national authoritative testing institutions in accordance with industrial standards released by the National Energy Administration, covering tensile strength, flexibility, elongation, corrosion resistance, low-temperature resistance, bending resistance and other indicators. This is the most comprehensive and stringent product testing standard available at present.
World-leading production and testing equipment, such as continuous casting and rolling lines for aluminum alloys, interlocked armored cable production lines for aluminum alloys, inductively coupled plasma optical emission spectrometers, three-layer co-extrusion production lines for medium and high-voltage cross-linked cables, automatic eccentricity measuring and correcting instruments, etc. Advanced equipment is an indispensable guarantee for manufacturing high-quality aluminum alloy cables.
Additional relevant certifications or documents as required by customers, such as product liability insurance certificates and export certification documents.