Three-fracture double-acting type high-speed permanent magnet repulsion switch and method thereof

Abstract

The invention discloses a three-fracture double-acting type high-speed permanent magnet repulsion switch and a method of the three-fracture double-acting type high-speed permanent magnet repulsion switch and belongs to the field of direct-current switches. The three-fracture double-acting type high-speed permanent magnet repulsion switch comprises a switch body, high-speed electromagnetic repulsion mechanisms, permanent magnetic operating mechanisms, contact springs, insulation pull rods, opening driving circuits, closing driving circuits, a detecting unit and a control unit. Each moving contact is connected to one end of one insulation pull rod through one contact spring, the other end of each insulation pull rod is connected with a driving rod, and each driving rod penetrates through a metal disc in one high-speed electromagnetic repulsion mechanism and is connected with a moving iron core; the control unit is respectively connected with a detecting circuit, the opening driving circuits and the closing driving circuits; each opening driving circuit is connected with an opening coil and each closing driving circuit is connected with a closing coil. According to the three-fracture double-acting type high-speed permanent magnet repulsion switch, a fracture with a large opening distance is formed at a short time and the opening speed of the switch is increased; meanwhile, according to the switch, the two moving contacts and two fixed contacts are in contact in sequence, so that when opening operation is conducted, the problems of movement dispersibility generated when multiple switches are independently driven and the like are solved.

Description

technical field [0001] The invention belongs to the technical field of DC switches, and in particular relates to a three-fracture double-action high-speed permanent magnet repulsion switch and a method thereof. Background technique [0002] With the continuous increase of the capacity of the DC power supply system, the short-circuit current level of the system is also increasing, which puts forward higher requirements for the working performance of the DC circuit breaker. The solid-state switch can cut off the fault current at the time level of microseconds, and has the advantage of no arc in the breaking process. However, its on-state loss is large, its load capacity is poor, and its withstand voltage level is low. The traditional contact mechanical circuit breaker has high insulation level and strong load capacity, but its action time is generally tens to hundreds of milliseconds, and is limited by the inherent action time of the mechanism, so the response speed is slow. ...

AI Technical Summary

Problems solved by technology

[0004] The response speed of traditional circuit breaker operating mechanisms, such as hydraulic mechanisms and spring mechanisms, is slow, and it is difficult to meet the action time requirements of high-speed mechanical switches in DC circuit breakers

Most of the high-speed mechanical switch design schemes currently proposed adopt the single-action butt-joint contact form. Even if the operating mechanism has a high opening speed, it is difficult to form a large opening distance in a short time. It is also the main reason why the current fast electromagnetic repulsion mechanism is only studied in the medium and low voltage field; while the disconnection method using multiple switches in series can realize multi-fracture voltage division, but it brings the dispersion of individual actions of the switch and the gap between switches. Problems such as instability of movement coordination

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