{"id":4716,"date":"2025-02-11T13:00:35","date_gmt":"2025-02-11T13:00:35","guid":{"rendered":"https:\/\/elkamehr.com\/en\/?p=4716"},"modified":"2025-02-11T13:00:40","modified_gmt":"2025-02-11T13:00:40","slug":"the-100-questions-answered-a-comprehensive-faq","status":"publish","type":"post","link":"https:\/\/elkamehr.com\/en\/the-100-questions-answered-a-comprehensive-faq\/","title":{"rendered":"The 100 Questions Answered: A Comprehensive FAQ"},"content":{"rendered":"

Table of Contents<\/h2>
  1. General Questions<\/a><\/li>\n\n
  2. Production and Processing Questions<\/a><\/li>\n\n
  3. Properties and Performance Questions<\/a><\/li>\n\n
  4. Application-Specific Questions<\/a><\/li>\n\n
  5. Future Trends and Challenges<\/a><\/li><\/ol>

    General Questions<\/h2>
    1. What does “EC-Grade Aluminum” mean?<\/strong>
      EC-Grade Aluminum stands for “Electrical Conductor Grade Aluminum.” It is a high-purity aluminum specially refined to achieve superior electrical conductivity. This material is optimized for use in electrical applications where low resistivity and high performance are critical.<\/li>\n\n
    2. Why is EC-Grade Aluminum used in electrical applications?<\/strong>
      It is used because its high conductivity minimizes energy losses during power transmission and distribution. The material\u2019s purity also leads to stable performance under heavy electrical loads, reducing heat generation and improving overall system efficiency.<\/li>\n\n
    3. How does EC-Grade Aluminum differ from standard aluminum?<\/strong>
      EC-Grade Aluminum undergoes additional refining processes to remove impurities that can hinder electrical performance. In contrast, standard aluminum may contain higher impurity levels that compromise conductivity and durability in electrical systems.<\/li>\n\n
    4. What are the key benefits of using EC-Grade Aluminum in electrical systems?<\/strong>
      The benefits include lower energy losses, enhanced conductivity, improved thermal stability, and better mechanical strength. These advantages lead to more efficient power transmission, reduced operational costs, and longer-lasting components.<\/li>\n\n
    5. What industries primarily use EC-Grade Aluminum?<\/strong>
      Industries such as power transmission, electrical distribution, renewable energy, and smart grid systems use EC-Grade Aluminum. It is also common in manufacturing electrical cabling, busbars, transformer windings, and related components.<\/li>\n\n
    6. How is the purity of EC-Grade Aluminum measured?<\/strong>
      Purity is determined through chemical analysis techniques like optical emission spectroscopy and X-ray fluorescence. These tests ensure that impurity levels, particularly for elements such as iron and silicon, remain below 0.005%.<\/li>\n\n
    7. What are the main impurities that affect aluminum conductivity?<\/strong>
      Impurities such as iron, silicon, and trace metals disrupt electron flow. Even minute amounts can increase electrical resistance, so achieving ultra-high purity is essential for optimal conductivity.<\/li>\n\n
    8. How is EC-Grade Aluminum sourced?<\/strong>
      It is produced from bauxite ore through well-established processes including the Bayer process and the Hall-H\u00e9roult electrolysis. Subsequent advanced purification steps ensure that the aluminum meets stringent quality standards for electrical use.<\/li>\n\n
    9. Is EC-Grade Aluminum recyclable?<\/strong>
      Yes, aluminum is one of the most recyclable metals. Recycled EC-Grade Aluminum can retain its high purity if proper recycling methods are followed, making it both economically and environmentally sustainable.<\/li>\n\n
    10. What are the environmental benefits of using EC-Grade Aluminum?<\/strong>
      Its high efficiency reduces energy losses, thereby lowering overall power consumption and greenhouse gas emissions. Additionally, its excellent recyclability helps conserve natural resources and reduces waste.<\/li>\n\n
    11. What is the historical development of EC-Grade Aluminum?<\/strong>
      The development began in the mid-20th century as engineers sought to improve the efficiency of electrical conductors. Advances in refining and processing led to the production of aluminum with very high purity, tailored for electrical applications.<\/li>\n\n
    12. When did EC-Grade Aluminum become common in electrical applications?<\/strong>
      It became widely adopted during the 1960s and 1970s when technological advancements made high-purity aluminum both reliable and economically viable for power transmission and distribution.<\/li>\n\n
    13. Who are the leading manufacturers of EC-Grade Aluminum?<\/strong>
      Major producers include global companies such as Alcoa, Rio Tinto, and other specialized regional manufacturers. These companies invest heavily in advanced refining technologies to meet the stringent demands of the electrical sector.<\/li>\n\n
    14. What standards govern the quality of EC-Grade Aluminum?<\/strong>
      International and industry-specific standards\u2014such as ASTM, IEC, and guidelines from the Electric Power Research Institute (EPRI)\u2014define the purity, conductivity, and mechanical properties required for EC-Grade Aluminum.<\/li>\n\n
    15. How does EC-Grade Aluminum impact energy efficiency in power systems?<\/strong>
      By offering lower electrical resistance, it reduces Joule heating and energy loss. This improved efficiency can translate to significant cost savings and a more reliable power supply over the system\u2019s life cycle.<\/li>\n\n
    16. Does EC-Grade Aluminum require special handling during installation?<\/strong>
      Yes, its high purity makes it more sensitive to contamination. Proper handling, specialized tools, and adherence to best practices during installation are crucial to preserving its electrical properties.<\/li>\n\n
    17. How does the cost of EC-Grade Aluminum compare to other conductive materials?<\/strong>
      It generally costs more than standard aluminum due to additional refining. However, the long-term energy savings and lower maintenance costs often offset the higher initial expense.<\/li>\n\n
    18. What are common misconceptions about EC-Grade Aluminum?<\/strong>
      One common misconception is that increased purity always leads to prohibitively high costs. In fact, while production costs are higher, the efficiency gains and reduced energy losses provide overall economic benefits.<\/li>\n\n
    19. Can EC-Grade Aluminum be used in residential electrical applications?<\/strong>
      Yes, it is suitable for residential use, particularly in wiring and cabling systems that benefit from improved energy efficiency and reliability.<\/li>\n\n
    20. How does the use of EC-Grade Aluminum contribute to grid reliability?<\/strong>
      Its stable performance under heavy loads and high temperatures helps maintain consistent voltage levels and reduces the risk of outages, thus enhancing overall grid reliability.<\/li><\/ol>

      Production and Processing Questions<\/h2>
      1. What refining process is used to produce EC-Grade Aluminum?<\/strong>
        EC-Grade Aluminum is produced by refining bauxite ore using the Bayer process, followed by the Hall-H\u00e9roult electrolysis process. Additional purification steps are then applied to achieve ultra-high purity.<\/li>\n\n
      2. How is the Bayer process involved in aluminum production?<\/strong>
        The Bayer process extracts alumina from bauxite ore. The extracted alumina is then used as the feedstock for electrolytic reduction in the Hall-H\u00e9roult process.<\/li>\n\n
      3. What role does the Hall-H\u00e9roult process play in producing EC-Grade Aluminum?<\/strong>
        It involves the electrolytic reduction of alumina dissolved in molten cryolite to produce primary aluminum. This process is critical in determining the purity of the final aluminum product.<\/li>\n\n
      4. How are impurities removed during the production of EC-Grade Aluminum?<\/strong>
        Impurities are removed through deoxidation, controlled chemical treatments, and advanced filtration systems. This rigorous purification ensures minimal impurity levels that could affect conductivity.<\/li>\n\n
      5. What deoxidation techniques are applied in the production process?<\/strong>
        Techniques include the addition of deoxidizing agents and strict control of the oxygen content during smelting. These steps help prevent the formation of oxide inclusions.<\/li>\n\n
      6. How does advanced filtration improve aluminum purity?<\/strong>
        Filtration removes solid impurities from the molten aluminum, resulting in a more uniform and pure product that meets the high standards for electrical applications.<\/li>\n\n
      7. What are the common challenges in producing EC-Grade Aluminum?<\/strong>
        Challenges include maintaining consistent high purity, controlling process temperatures, and preventing contamination during each stage of production.<\/li>\n\n
      8. How is EC-Grade Aluminum cast into billets?<\/strong>
        Once purified, the molten aluminum is cast into billets under controlled cooling conditions. This step is essential for ensuring uniformity before further processing.<\/li>\n\n
      9. What is the significance of extrusion in forming EC-Grade Aluminum products?<\/strong>
        Extrusion shapes the aluminum into specific profiles required for electrical components. It also aligns the microstructure to improve both conductivity and mechanical strength.<\/li>\n\n
      10. How does the rolling process affect the properties of EC-Grade Aluminum?<\/strong>
        Rolling reduces the material\u2019s thickness and refines its grain structure, which enhances its electrical and mechanical properties.<\/li>\n\n
      11. What role does heat treatment play in enhancing EC-Grade Aluminum performance?<\/strong>
        Heat treatment optimizes the microstructure by relieving stresses and promoting a uniform grain size, which boosts conductivity and strength.<\/li>\n\n
      12. How are cooling rates controlled during production?<\/strong>
        Advanced temperature control systems ensure rapid and uniform cooling. This minimizes impurity segregation and improves the material\u2019s overall performance.<\/li>\n\n
      13. What testing methods are used to verify the purity of EC-Grade Aluminum?<\/strong>
        Techniques such as optical emission spectroscopy (OES), X-ray fluorescence (XRF), and eddy current testing are commonly used to measure purity and conductivity.<\/li>\n\n
      14. How frequently are quality control tests performed during production?<\/strong>
        Quality control is performed continuously at multiple stages\u2014from raw material intake through to the final product\u2014to ensure consistent quality.<\/li>\n\n
      15. What instrumentation is used for chemical analysis in aluminum production?<\/strong>
        Instruments like OES and XRF provide precise measurements of elemental composition, ensuring that impurity levels remain within acceptable limits.<\/li>\n\n
      16. How is electrical conductivity measured during quality control?<\/strong>
        Methods such as the four-point probe and eddy current testing are used to accurately measure the material\u2019s conductivity relative to the IACS standard.<\/li>\n\n
      17. What are the typical conductivity targets for EC-Grade Aluminum?<\/strong>
        EC-Grade Aluminum generally aims for conductivity levels between 60% and 61% IACS, a benchmark that ensures high efficiency in electrical applications.<\/li>\n\n
      18. How do manufacturers ensure consistency across production batches?<\/strong>
        Automated monitoring systems, strict quality protocols, and regular calibration of instruments help maintain consistent production quality.<\/li>\n\n
      19. What challenges do producers face in maintaining high purity levels?<\/strong>
        Challenges include variations in raw material quality, controlling process parameters, and preventing contamination during handling and processing.<\/li>\n\n
      20. How do production improvements impact the cost of EC-Grade Aluminum?<\/strong>
        Innovations in refining and process automation can reduce waste and energy consumption, ultimately lowering production costs while maintaining high quality.<\/li><\/ol>

        Properties and Performance Questions<\/h2>
        1. What is the typical electrical conductivity of EC-Grade Aluminum?<\/strong>
          EC-Grade Aluminum typically achieves conductivity levels of 60% to 61% IACS, making it highly effective in reducing energy losses.<\/li>\n\n
        2. How is electrical conductivity expressed in EC-Grade Aluminum?<\/strong>
          It is expressed as a percentage relative to the International Annealed Copper Standard (IACS), with copper representing 100%.<\/li>\n\n
        3. What factors influence the conductivity of EC-Grade Aluminum?<\/strong>
          Conductivity is influenced by purity, microstructure, and the absence of impurities. Processing conditions and heat treatment also play key roles.<\/li>\n\n
        4. How does the microstructure of EC-Grade Aluminum affect its performance?<\/strong>
          A fine, uniform microstructure minimizes electron scattering and enhances both conductivity and mechanical strength.<\/li>\n\n
        5. What mechanical properties are important for electrical applications?<\/strong>
          Tensile strength, yield strength, ductility, and thermal stability are crucial. These properties ensure the material can handle physical and thermal stresses.<\/li>\n\n
        6. What is the typical tensile strength of EC-Grade Aluminum?<\/strong>
          Tensile strength usually ranges from 70 MPa to 110 MPa, depending on the processing methods and final product form.<\/li>\n\n
        7. How does ductility factor into the performance of EC-Grade Aluminum?<\/strong>
          High ductility enables easy forming, installation, and resistance to cracking under stress, which is essential for long-term reliability.<\/li>\n\n
        8. How does thermal stability contribute to the material’s efficiency?<\/strong>
          Thermal stability ensures that the aluminum maintains its electrical properties under high operating temperatures, reducing energy loss.<\/li>\n\n
        9. What is the thermal expansion coefficient of EC-Grade Aluminum?<\/strong>
          It is typically around 23 x 10\u207b\u2076\/\u00b0C, which helps maintain dimensional stability in varying temperature conditions.<\/li>\n\n
        10. How does EC-Grade Aluminum perform under high temperatures?<\/strong>
          It retains its conductivity and structural integrity, making it suitable for high-load applications even at elevated temperatures.<\/li>\n\n
        11. What are the corrosion resistance properties of EC-Grade Aluminum?<\/strong>
          High purity and the application of protective coatings yield excellent corrosion resistance, even in harsh environments.<\/li>\n\n
        12. How do protective coatings enhance the durability of EC-Grade Aluminum?<\/strong>
          Coatings protect the surface from oxidation and environmental damage, extending the life of the material in electrical applications.<\/li>\n\n
        13. What role does alloying play in improving electrical properties?<\/strong>
          Minor additions of specific elements can enhance strength and stability without compromising conductivity when carefully controlled.<\/li>\n\n
        14. How does the purity level affect the mechanical properties?<\/strong>
          Higher purity results in fewer defects, leading to better mechanical performance and more consistent electrical properties.<\/li>\n\n
        15. What standards exist for measuring the physical properties of EC-Grade Aluminum?<\/strong>
          Standards from ASTM, IEC, and IEEE set benchmarks for conductivity, strength, and durability, ensuring uniformity across products.<\/li>\n\n
        16. How is the performance of EC-Grade Aluminum validated in the lab?<\/strong>
          Laboratory tests such as tensile tests, conductivity measurements, and microstructural analysis are used to validate performance.<\/li>\n\n
        17. How do field tests confirm laboratory results for EC-Grade Aluminum?<\/strong>
          Field tests monitor energy losses, durability, and overall performance in real-world conditions, confirming laboratory data.<\/li>\n\n
        18. What are common failure modes in EC-Grade Aluminum electrical components?<\/strong>
          Failures may include corrosion, mechanical fatigue, or degradation of conductivity due to impurity buildup over time.<\/li>\n\n
        19. How is microstructural analysis used to assess quality?<\/strong>
          Techniques such as scanning electron microscopy (SEM) examine the grain structure and detect any defects or impurity clusters.<\/li>\n\n
        20. How does EC-Grade Aluminum compare to copper in terms of conductivity?<\/strong>
          While copper offers 100% IACS, EC-Grade Aluminum provides a competitive balance of cost, weight, and performance, making it a preferred choice in many applications.<\/li><\/ol>

          Application-Specific Questions<\/h2>
          1. In which electrical components is EC-Grade Aluminum most commonly used?<\/strong>
            It is used in overhead conductors, underground cables, busbars, transformer windings, and various connectors.<\/li>\n\n
          2. How does EC-Grade Aluminum improve the performance of overhead conductors?<\/strong>
            Its high conductivity reduces energy losses, and its strength and light weight simplify installation and improve durability.<\/li>\n\n
          3. What advantages does EC-Grade Aluminum offer in underground cables?<\/strong>
            The material\u2019s low resistivity and high purity result in minimal power loss and reduced heating, which are critical in densely populated urban areas.<\/li>\n\n
          4. How is EC-Grade Aluminum utilized in busbars?<\/strong>
            Busbars made from EC-Grade Aluminum ensure efficient current distribution with low voltage drop, enhancing overall system performance.<\/li>\n\n
          5. What role does EC-Grade Aluminum play in transformer windings?<\/strong>
            Its excellent electrical conductivity improves transformer efficiency and reduces energy losses during operation.<\/li>\n\n
          6. How does EC-Grade Aluminum contribute to renewable energy systems?<\/strong>
            It increases the efficiency of power transmission in solar panels, wind turbines, and energy storage systems by lowering resistive losses.<\/li>\n\n
          7. What benefits does EC-Grade Aluminum provide in solar panel installations?<\/strong>
            Its high conductivity and durability maximize energy output and extend the lifespan of the electrical components in solar systems.<\/li>\n\n
          8. How is EC-Grade Aluminum used in wind turbine electrical systems?<\/strong>
            It is employed for cabling, connectors, and interconnection components, where its reduced weight and improved performance are critical.<\/li>\n\n
          9. Can EC-Grade Aluminum be applied in electric vehicle charging stations?<\/strong>
            Yes, its reliability and high conductivity make it ideal for wiring and busbars in EV charging infrastructure.<\/li>\n\n
          10. How does EC-Grade Aluminum enhance the efficiency of smart grids?<\/strong>
            Smart grids benefit from its consistent performance and low energy losses, which contribute to better load management and reduced maintenance needs.<\/li>\n\n
          11. What are the installation requirements for EC-Grade Aluminum components?<\/strong>
            Installation requires careful handling to avoid contamination, precision in connections, and adherence to industry-standard practices to maintain purity.<\/li>\n\n
          12. How does EC-Grade Aluminum affect the overall reliability of electrical networks?<\/strong>
            Its stable conductivity and mechanical durability lead to fewer outages and improved system uptime in power transmission and distribution.<\/li>\n\n
          13. How is EC-Grade Aluminum integrated into modern electrical infrastructure?<\/strong>
            It is incorporated into both new installations and retrofits using standardized components such as cables, busbars, and conductors.<\/li>\n\n
          14. What maintenance practices are recommended for EC-Grade Aluminum installations?<\/strong>
            Regular inspections, cleaning, and the periodic reapplication of protective coatings are advised to preserve performance.<\/li>\n\n
          15. How does EC-Grade Aluminum perform in high-voltage applications?<\/strong>
            It maintains excellent conductivity and resists thermal stress, making it well suited for high-voltage transmission lines.<\/li>\n\n
          16. What are the safety benefits of using EC-Grade Aluminum in electrical systems?<\/strong>
            Lower energy losses reduce the risk of overheating, and its robust mechanical properties enhance system integrity, contributing to overall safety.<\/li>\n\n
          17. How does the lightweight nature of EC-Grade Aluminum benefit installation?<\/strong>
            The material\u2019s lower density reduces the load on support structures and simplifies handling, which can lead to faster and more cost-effective installations.<\/li>\n\n
          18. What role does EC-Grade Aluminum play in reducing energy losses?<\/strong>
            Its low electrical resistance minimizes Joule heating, directly reducing energy losses during transmission and distribution.<\/li>\n\n
          19. How does the use of EC-Grade Aluminum impact system longevity?<\/strong>
            Improved durability and resistance to corrosion extend the service life of electrical components, resulting in lower maintenance costs and fewer replacements.<\/li>\n\n
          20. How do urban infrastructure projects benefit from EC-Grade Aluminum?<\/strong>
            Enhanced efficiency, easier installation, and reduced energy losses contribute to the reliability and sustainability of urban electrical networks.<\/li><\/ol>

            Future Trends and Challenges<\/h2>
            1. What innovations are on the horizon for EC-Grade Aluminum production?<\/strong>
              New refining techniques and process automation are expected to further improve purity and reduce production costs while enhancing overall performance.<\/li>\n\n
            2. How might nanotechnology improve EC-Grade Aluminum properties?<\/strong>
              Nanotechnology can refine the microstructure by incorporating nano-reinforcements that reduce impurity clustering and improve electrical conductivity.<\/li>\n\n
            3. What research is being conducted to further enhance conductivity?<\/strong>
              Researchers are exploring novel alloy compositions, advanced heat treatment protocols, and innovative processing methods to maximize purity and conductivity.<\/li>\n\n
            4. How will smart grid technology affect the use of EC-Grade Aluminum?<\/strong>
              Smart grids require reliable, high-performance materials. Integrated digital sensors and real-time monitoring can optimize conductor performance and predictive maintenance.<\/li>\n\n
            5. What environmental trends are influencing the demand for high-purity aluminum?<\/strong>
              Growing emphasis on energy efficiency and reduced emissions drives the demand for materials that lower power losses and support sustainable energy systems.<\/li>\n\n
            6. How will recycling technologies impact the future of EC-Grade Aluminum?<\/strong>
              Enhanced recycling processes can recover high-purity aluminum with minimal degradation, ensuring that recycled EC-Grade Aluminum remains an eco-friendly and cost-effective option.<\/li>\n\n
            7. What are the potential cost reductions with advancements in production?<\/strong>
              Improvements in process efficiency, automation, and scale can lower production costs, making EC-Grade Aluminum more competitive in the market.<\/li>\n\n
            8. How do government regulations affect the production of EC-Grade Aluminum?<\/strong>
              Strict environmental and energy-efficiency regulations encourage manufacturers to produce higher-quality materials that meet rigorous standards.<\/li>\n\n
            9. What global trends are shaping the market for EC-Grade Aluminum?<\/strong>
              The growth of renewable energy, expansion of smart grids, and increased electrification of transportation drive global demand for high-performance electrical conductors.<\/li>\n\n
            10. How might digital monitoring systems improve performance evaluation?<\/strong>
              Real-time data from digital monitoring systems allows for proactive maintenance and fine-tuning of system performance, ensuring that EC-Grade Aluminum components operate at peak efficiency.<\/li>\n\n
            11. What challenges remain in achieving consistent production quality?<\/strong>
              Maintaining uniform purity and microstructure across large production batches remains challenging, with variations in raw materials and process conditions as key obstacles.<\/li>\n\n
            12. How is the industry addressing issues of raw material supply?<\/strong>
              Diversification of supply sources and investment in sustainable mining practices help stabilize the availability of high-quality bauxite for aluminum production.<\/li>\n\n
            13. What are the prospects for reducing the energy consumption of production processes?<\/strong>
              Innovations in smelting technology and process automation promise significant energy savings, which can lower both production costs and environmental impact.<\/li>\n\n
            14. How will global energy demands drive the evolution of EC-Grade Aluminum?<\/strong>
              Rising global energy needs will accelerate demand for efficient electrical conductors, spurring further technological advancements and higher production volumes.<\/li>\n\n
            15. What are the main challenges in scaling up production?<\/strong>
              Scaling production while maintaining quality, controlling costs, and meeting environmental standards are the primary challenges facing the industry.<\/li>\n\n
            16. How can manufacturers reduce the environmental impact of aluminum production?<\/strong>
              Adopting energy-efficient processes, increasing the use of recycled materials, and adhering to strict environmental guidelines can help reduce the carbon footprint of production.<\/li>\n\n
            17. What role does international collaboration play in advancing aluminum technology?<\/strong>
              Collaboration among researchers, manufacturers, and regulatory bodies across different countries fosters innovation and helps establish universal quality standards.<\/li>\n\n
            18. How might future innovations change the cost dynamics of EC-Grade Aluminum?<\/strong>
              Breakthroughs in production technology and increased automation are likely to reduce manufacturing costs, making high-purity aluminum more affordable.<\/li>\n\n
            19. What are the long-term sustainability prospects for EC-Grade Aluminum?<\/strong>
              High recyclability, improved energy efficiency, and ongoing process innovations support the long-term sustainability of EC-Grade Aluminum in the electrical industry.<\/li>\n\n
            20. What is the overall future outlook for EC-Grade Aluminum in electrical applications?<\/strong>
              The outlook is positive, with continued innovation, growing demand from renewable energy and smart grid projects, and a strong focus on sustainability driving its adoption in electrical applications worldwide.<\/li><\/ol>

              References<\/h2>

              ASTM International. (2020). Standard Specification for Aluminum and Aluminum-Alloy Sheet and Plate<\/em>.
              Electric Power Research Institute (EPRI). (2022). Economic Analysis of Advanced Conductor Technologies<\/em>.
              IEEE Transactions on Power Delivery. (2021). Performance Metrics of High-Purity Aluminum Conductors<\/em>.
              IEC. (2019). Standards for Electrical Conductor Materials<\/em>.
              Jones, M., & Lee, A. (2021). Advances in High-Conductivity Aluminum Alloys<\/em>. Journal of Materials Science, 36(4), 412\u2013430.
              Smith, J. (2018). Case Studies on Electrical Applications of EC-Grade Aluminum<\/em>. Materials Science in Electrical Engineering, 29(3), 255\u2013270.<\/p>","protected":false},"excerpt":{"rendered":"

              Table of Contents General Questions Production and Processing Questions Properties and Performance Questions Application-Specific Questions Future Trends and Challenges References ASTM International. (2020). Standard Specification for Aluminum and Aluminum-Alloy Sheet and Plate.Electric Power Research Institute (EPRI). (2022). Economic Analysis of Advanced Conductor Technologies.IEEE Transactions on Power Delivery. (2021). 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