Characteristic analysis and design of a novel lorentz force driving actuator for a molded case circuit breaker

Abstract

Recently, the demand for a remote controllable actuator for a circuit breaker (CB) has increased because of the trend towards the automation and information technology (IT) of the power system. However, the conventional molded case CB (MCCB) -of which demand is high among CBs -is not only manually controlled, but also liable to breakdown and difficult to find broken components because of the use of the mechanical spring type actuator. To address these problems, a novel Lorentz force driving actuator (LA) is proposed in this research. The LA is suitable for both low-and high-power CBs because of its high power density and the unaffectedness of performance by the stroke. The MCCB equipped with the LA is the first remote controllable low-power CB and low in maintenance cost. The correct and rapid analysis and design method using a twodimensional magneto-static field analysis and a dynamic analysis is proposed for the small size actuator as LA in this research.

Analysis and design of diverse electromagnet type actuators for moulded case circuit breaker

“…(ii) Design results: For the low-voltage CB, the size and cost are the most important factors among characteristics. Thus, the operation time T, the current peak I p , and the height of the coil slot h s are normalised and combined into one objective function f as shown in (13) weighting each parameter as 10, 10, and 80%, respectively…”

Unsymmetrical bistable multimagnetic circuit permanent magnet actuator for high‐voltage circuit breaker application: analysis, design, and dynamic simulation

“…The design method, with the Taguchi method and dynamic characteristic analysis, is presented for the unsymmetrical bistable PMA with magnetic barriers [26]. To increase the long stroke of the PMA, the moving coil unsymmetrical bistable PMA (MCUBPMA) is presented in [27]. The static characteristics, dynamic characteristics, and conduct parameter design of the MCUBPMA are analysed and investigated using a four-order Runge-Kutta method, finite-element method, and Visual Basic [28].…”

“…However, the holding force in the open stage is over the need of HVCB, which increases the wastage and closing time. Thus, the unsymmetrical structure bistable PMA (USBPMA) is proposed, which overcomes some of the disadvantages of the SSBPMA, such as the large retention in the opening state, and large closing current [22][23][24][25][26][27][28][29]. However, the USBPMA also has defects, such as a low initial speed.…”

Simple Analysis Method for the Interrupting Capability of a Contact System in a Molded Case Circuit Breaker

“…For an effective cabinet panel, the MCCB should increase the interrupting capability and satisfy the compact requirement for installation. There is a need for standardization of the smaller sized cabinet panels [1][2][3][4].…”