Featured Paper by O. Craciun, V. Biagini, G. Mechler, G. Stengel, C. Reuber & A. van der Linden
Introduction: Medium voltage reclosers are representing nowadays an important link between transmission power systems and low voltage grids. With a high level of renewable energy penetration, the medium voltage networks are becoming bidirectional. Therefore, the associated switching devices must ensure the protection of newer types of power systems as well as new types of loads. The optimal design of medium voltage reclosers is therefore important in order to enable high level switching capabilities. GriedShield recloser is a well know medium voltage protection device where the single coil actuators are being successfully used. GriedShield recloser has the ability to perform as a recloser, sectionalizer or automated load break switch. Proven design rated for 10.000 full load operations [1]. One pole of such device can be considered as being composed of two main subsystems: power and actuation. The first is represented by the power connections and the key element that ensures the arc extinguish - the vacuum interrupter [2]. The second subsystem can be either mechanical or an electromagnetic-based actuation unit. The electromagnetic solution presents several advantages compared to the mechanical approach, such as fewer components, higher reliability and less maintenance. The dynamic characteristics of electromagnetic actuators are strongly influenced by their shape, material proprieties, electric and mechanical elements. The magnetic, electric and mechanical dynamics are actually mutually dependent, with each affecting the others. Therefore, in order to ensure a fast and efficient design it is important to consider the Finite Element modeling and simulation enabling electromagnetic actuators virtual prototyping. This paper focuses on modeling, simulation and optimization of the electromagnetic actuators integrated in ABB’s reclosers. In the next section, this paper gives an overview regarding the operating principle of a single phase recloser. The third part focuses on the set-up of a steady-state 2D finite element simulation including materials non-linearity. The fourth section illustrates the coupling of the 2D model with an optimization software, modeFrontier [3] as well as an optimization case study. The next section introduces the challenges related to the actuator’s modeling and simulation in 3D Transient. The final part of this paper presents the contribution of this work as well as the perspectives.
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