The core objective of current research on porcelain insulators is to improve their electromechanical performance, reliability, environmental adaptability, and intelligence to support the construction of modern power grids such as ultra-high voltage (UHV) transmission lines.
Materials Research and Modification
Research focuses on developing high-strength alumina-based porcelain composite materials. By optimizing the proportions and preparation processes of raw materials such as industrial alumina powder and reinforcing powder, the flexural strength and electrical breakdown strength of the porcelain body can be significantly improved. The development of industrial alumina formulations is also an important direction for improving the anti-aging performance of rod-shaped support products. Semiconductor glaze technology is a research hotspot. By adding semiconductor properties to the glaze layer, leakage current and heat are generated during insulator operation, effectively solving the problems of icing and flashover in extremely cold and polluted areas. Domestic companies have already achieved industrial-scale production of second-generation semiconductor glaze products. In addition, the development of special glazes such as blue-gray glaze also meets specific market demands.
Structural Design and Optimization
Utilizing numerical simulation methods such as finite element analysis to optimize the structure of key components of insulators is an important research direction. To address the issue of easy breakage at the head of large-tonnage suspension porcelain insulators in ultra-high voltage applications, research has been conducted to optimize the head structure parameters through mechanical and electric field analysis, effectively improving its electromechanical destructive performance. Structural optimization aims to achieve a more uniform stress distribution and a more rational electric field strength, thereby enhancing overall mechanical strength and operational reliability.
Manufacturing Process Innovation
Refined and intelligent manufacturing processes are key to improving product consistency and performance. By controlling raw material quality, introducing sand milling to eliminate the influence of large particles, optimizing glaze formulas, and improving sand milling, glaze coating, and firing processes, the problem of large strength dispersion in porcelain components can be solved. Optimization of injection molding processes and online monitoring methods have also been applied to the production of new hybrid post porcelain insulators. Innovative drying processes, such as changing from "lying flat for natural air drying" to "vertical electric air drying," can significantly improve the uniformity of body moisture and production efficiency. Continuous optimization of the firing process is also a research focus. The industry is actively promoting the automation, informatization, and intelligent transformation of production lines, such as applying fully automatic trimming machines and establishing intelligent production management platforms, to achieve a significant increase in production efficiency. Meanwhile, by upgrading thermal equipment and tapping into the potential of waste heat utilization, energy consumption can be significantly reduced, promoting green manufacturing.
Functionalization and Intelligent Enhancement
To cope with harsh environments such as icing and pollution, in addition to semiconductor glazes, active anti-icing technologies such as "solar thermal + semiconductor coating" and passive protective coatings such as superhydrophobic and dustproof coatings have been developed. Developing advanced online detection technologies is an important direction for ensuring power grid safety. For example, "vibration acoustic flaw detection" technology analyzes the vibration feedback waves of insulators, enabling rapid and accurate detection of hidden defects such as internal cracks without power outages.
Future Development Trends
Porcelain insulator technology is developing towards higher performance, greater intelligence, greater environmental friendliness, and wider application. Higher performance is reflected in adapting to higher voltage levels, withstanding greater mechanical loads, pursuing longer service life, and higher operational reliability. Greater intelligence refers to integrating sensing and monitoring functions to achieve real-time perception and intelligent diagnosis of operating status. Greater environmental friendliness requires optimizing manufacturing processes, reducing energy consumption, and developing environmentally friendly materials and coatings. The wider application is reflected in the fact that domestically produced high-end porcelain insulators have broken the international monopoly and are widely used in major domestic power grid projects, and are accelerating their expansion into overseas markets.
