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Selector switch and universal transfer switch

Time:2018/12/29Author:adminClick: 503
The selector switch is a multi-gear, multi-contact, multi-loop control device, commonly used for closing and opening control of low-voltage line operating mechanisms, conversion of various control lines, and commutation measurement of ammeters and voltmeters. And control the start, reversing, speed regulation, etc. of the small-capacity motor, because it has many control lines and wide applications, it is often called universal conversion switch.
The selector switch is a multi-gear, multi-contact, multi-loop control device, commonly used for closing and opening control of low-voltage line operating mechanisms, conversion of various control lines, and commutation measurement of ammeters and voltmeters. And control the start, reversing, speed regulation, etc. of the small-capacity motor, because it has many control lines and wide applications, it is often called universal conversion switch.

The universal transfer switch is composed of a plurality of sets of contact assemblies of the same structure, and is composed of an operating mechanism, a positioning device and a contact. There are 2 to 12 operating positions, and the base of the contact has l to 10 layers. Each layer of the road and bridge engineering base can be equipped with three pairs of contacts. Each layer of cam can be made into different shapes. When the handle is rotated to different positions, it passes. The cam action can make each pair of contacts turn on or off according to the required law. At present, the most widely used universal transfer switch products are two series of lw5 and lw6.

The contacts of the lw5 series are double-break bridge structures, and the movable contacts are designed to be automatically adjusted to ensure synchronization during switching, and the static contacts are mounted in the contact holders. Each pair of contact blocks pressed by bakelite can be installed with 2 to 3 pairs of contacts, and each group of contacts has an arc-dissipating device. The opening and closing of the contacts is controlled by the cam. In order to meet different needs, the handle can also be made into a signal type, a key type and the like.

The lw5 series universal switch is divided into two types: self-resetting and positioning according to the handle operation mode. The so-called self-resetting method refers to automatically returning to the original position when the hand is released after the handle is pulled by a hand. The positioning type refers to the position of the handle staying in the position after the hand is released by the hand.

The operating position of the universal transfer switch handle is expressed by angle. Different types of universal transfer switches have different operating positions for the handles. They can be found in the “positioning characteristics table of the universal transfer switch” in the electrical equipment manual.

The graphical symbol table of the contact of the universal transfer switch is shown in Figure 2-10, but since the contact state of the contact is related to the position of the operating handle, the contact pattern is drawn in the circuit diagram. In addition to the symbol, there should also be a representation of the position of the operating handle and the state of contact separation. There are two ways to represent it. One is to draw a dotted line and draw a "." in the circuit diagram, that is, the position of the operation handle is indicated by a broken line, and the "·" is used to indicate the closed and open state of the contact, three grids. Universal switch structure.

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