Switching Arc and Current Limiting Technology of Low-Voltage Circuit Breakers (New Series of Low-Voltage Electrical Apparatus Technology)

Author: Chen Degui
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Features: Supported by six research fundings including the National Natural Science Foundation of China, the National Machinery Industry Technology Development Fund, and the Special Research Fund for Doctoral Programs of the Ministry of Education, the author has compiled this work based on multiple research achievements and integrated the latest international research findings in this field. Combining the interruption process of low-voltage circuit breakers, it comprehensively describes the physical characteristics of switch arcs in various stages, including the arc stagnation phenomenon at the initial interruption stage, the gas blow and magnetic blow during the arc movement process, the repulsion process of the moving contact, and the coordination of mechanism actions. It also covers new content such as the back-arc phenomenon after the arc enters the arc-quenching grid, and analyzes the influence of various factors on these physical phenomena as well as measures to improve the interruption performance of circuit breakers. While analyzing the basic physical characteristics of air-medium arcs, it proposes a new research and development method for low-voltage circuit breaker arc-quenching systems based on modern testing technology. This method uses an oscillating circuit as the power source and focuses on detachable arc-quenching structures as the research subjects. Modern testing techniques such as high-speed arc movement cameras and various sensors are employed to analyze the macro and micro performance of different arc-quenching chamber structures. This approach is of great significance for accelerating the research and development speed of low-voltage electrical products and reducing development costs. This book serves as a reference for engineering technicians engaged in the design, manufacturing, testing, and operation of electrical equipment, and can also be used as a teaching and research reference material for relevant majors in higher education institutions and postgraduate studies.