The purpose of the work is to improve mathematical models and algorithms computer modeling multiphysics processes in electromagnets actuators vacuum switching devices by taking into account contact interaction structural elements when changing their stress-strain state. In design modern circuit breakers contactors, there a significant use electromagnetic based on high-coercive hard magnetic rar...

Circuit breakers for residential branch circuits must trip at or below 135% of rated current. A breaker that fails requirement is defective. Samples two brands, purchased from retail sources, are tested basic calibration. Both brands were 4 years ago. Previous samples one brand 50% defective, and new manufactured in 2021 28% The second brand, previously defect-free, again defect-free. test resu...

In electrical transmission grids, it is common to observe the states of circuit breakers. While they are known at irregular times, system modeling and grid state estimation highest importance ensure secure operations. This paper proposes a richer method estimate over its reference configurations based on temporal evolution breakers’ states. The first contribution consists in developing general ...

High voltage DC grid is developing towards more terminals and larger transmission capacity, thus the requirements for circuit breakers (DCCB) will rise. The conventional methods only use faulty line DCCB to withstand fault stress, while this paper presents a coordination method of multiple DCCBs protect system. As many adjacent are tripped interrupt current, energy shared, requirement reduced. ...

Vacuum circuit breaker becomes more and more complicated, integrated, high-speed and intellectualized. To insure vacuum circuit breaker in its good conditions, the function of fault diagnosis gets more important than before in the process of repairing. This paper is addressed a modelbased fault detection framework for vacuum circuit breaker by trip coil analysis. At first, the electromagnetic m...