An Electromagnetically Actuated Vacuum Circuit Breaker Developed by Electromagnetic Analysis Coupled with Motion

Abstract

A new electromagnetically actuated vacuum circuit breaker (VCB) has been designed and developed on the basis of the transient electromagnetic analysis coupled with motion. The VCB has three advanced bistable electromagnetic actuators, which control each phase independently. The VCB serves as a synchronous circuit breaker as well as a standard circuit breaker. In this work, the flux delay due to the eddy current is analytically formulated using the delay time constant of the actuator coil current, thereby leading to accurate driving behavior. With this analytical method, the electromagnetic mechanism for a 24 kV rated VCB has been optimized; and as a result, the driving energy is reduced to one fifth of that of a conventional VCB employing spring mechanism, and the number of parts is significantly decreased. Therefore, the developed VCB becomes compact, highly reliable and highly durable.

Development of Mechanical CBM System for Electromagnetically Actuated Vacuum Circuit Breaker

“…3) was achieved by solving the problem of the discontinuity of the contact pressure spring force and the mass of movable contact using the law of conservation of momentum [2]. Here, the delay of magnetic flux and electromagnetic force by eddy current are expressed as the Eqs.…”

“…In spring operating equipment often used in conventional high voltage breakers, the CBM method with trip electromagnet to release latching has been proposed [4]. By arranging constituting parts in respective phase in line, the number of parts, such as latches and rotation levers used in conventional spring operating type VCB, can be reduced, thereby the minimization of driving energy can be realized [2,3]. We further report the effectiveness verification of this function using a prototype of 24 kV-rated VCB.…”

“…On the other hand, we have developed the electromagnetically actuated vacuum circuit breaker (VCB) for the improvement of reliability by reducing the number of parts and planned to launch it into market [2,3]. To achieve CBM for the VCB, a monitoring device to monitor state of device and a system to diagnose monitoring result are indispensable.…”

“…By supplying current to one operating coil, either opening or closing operation is carried out. By arranging constituting parts in respective phase in line, the number of parts, such as latches and rotation levers used in conventional spring operating type VCB, can be reduced, thereby the minimization of driving energy can be realized [2,3].…”

A Three‐Position Swing Electromagnetic Actuator with an Integrated Eddy Current Brake for Suppression of the Operating Time and Improvement of the Stopping Accuracy

“…In the recent years, electromagnetic actuators generating high output torque have been used in transportation equipment, electromagnetic switches, and other devices [1][2][3][4][5][6][7]. Besides, multistable electromagnetic operation devices capable of stopping at multiple positions are needed for switches in electric power systems, solenoid valves, and so on [8][9][10][11].…”