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Vacuum circuit breakers are well established in the distribution levels of the electrical power grids. To minimize contact erosion, an RMF-contact design forces the arc to rotate. The performance of the RMF-contact designs is usually evaluated in specific model vacuum chambers with viewing ports allowing high speed cameras to observe the arc rotation. These setups differ significantly from commercial...
The primary purpose of an RMF (radial magnetic field) contact system is to force the constricted vacuum arc to rotate on the contact surface, thereby increasing the interruption level and reducing contact erosion. The ability to detect the movement characteristic of the rotating arc inside a vacuum bottle is an important tool to improve performance and lifetime of the contact system. The conventional...
This research project focuses on developing a measurement system which is able to detect the arc motion in a RMF (radial magnetic field) contact system. The arc movement is measured by analyzing the magnetic field signals of several external induction coils detecting the magnetic field changes from the rotating arc. In this way it is possible to analyze the dynamic characteristics of constricted vacuum...
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