Research on the failure and fracture factors of spring in high voltage circuit breakers

The failure of the operating spring stress in high-voltage circuit breakers, along with fatigue fracture, can result in inadequate opening and closing speeds, exceeding the specified opening and closing times, and the inability to close, seriously affecting the safe and stable operation of equipment and the power grid. In the actual production and maintenance processes, neglecting the operating conditions of the high-voltage circuit breaker spring, such as temperature, loading position, preload, motor vibration, and other factors, leads to poor estimation accuracy of the spring's fatigue state and remaining life. Additionally, the inability to accurately judge the creep and relaxation characteristics of the spring during use results in phenomena such as spring creep deformation and relaxation, leading to problems of missing maintenance opportunities. This paper focuses on studying the influence of external operating conditions, as well as creep and relaxation characteristics, on the properties of the spring. It aims to provide relevant support for the design and operation of springs in subsequent applications.