Abstract:
Background The compact pulsed power source has a complex internal structure and high operating voltage. There may be local breakdown discharge inside the sealed cavity of a pulsed power source, which can degrade the system's performance and even cause equipment damage. It is necessary to study an online partial discharge monitoring method for the pulsed power sources.
Purpose This study aims to improve the health management level of the system, therefore an invasive real-time online monitoring and optical diagnostic positioning method was proposed. A small-sized high-pressure sealed rotating lens with strong electromagnetic pulse protection has been designed to solve the adaptability problem of invasive lenses in a closed cavity under high voltage, high pressure, and strong electromagnetic pulse environment.
Methods By utilizing the partial discharge luminescence law, internal discharge monitoring and directional positioning were achieved. A system for real-time online monitoring and diagnosis of high-voltage insulation failure has been developed, consisting of an invasive exploration lens, a power conversion module, and a display storage terminal. Optical monitoring signals can be transmitted over long distances through optical fibers and connected to a health management system.
Results Based on a lightweight and miniaturized pulsed power source, real-time monitoring experiments were conducted inside the pulse forming line cavity to verify the feasibility of partial discharge diagnosis and positioning technology. The experimental results show that the proposed method is suitable for monitoring high-voltage insulation failure in pulsed power sources. It can intuitively detect partial discharge phenomena and use optical rotating lenses to locate discharge positions.
Conclusions It can be applied to dynamic health management of pulsed power sources and also helps to detect and improve the verification of design defects in newly developed pulsed power sources.
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