时间继电器工作原理（Time relay operating principle）.doc

时间继电器工作原理（Time relay operating principle） Time relay First, the time relay of the electrical control system is a very important component. Generally divided into two types of power delay and power delay. From the principle of action, there are electronic, mechanical and so on. Electronic is the use of capacitor charging and discharging, and then with the principle of electronic components to achieve delayed action. There are many mechanical styles, such as airbag, spring airbag, clock escapement, and small cap synchronous motor drive cam, and now more new time relays will appear. The use of time relay is to meet the technical requirements, the implementation of delayed instructions. Two, relay An automatic electrical device whose electrical output circuit is switched on or blocked when the amount of physical input reaches a specified value. Widely used in the production process automation devices, power system protection devices, various types of remote control, remote control and communication devices, is the modern automatic control system, one of the most basic electrical components. Generally, the relay is composed of two parts, an input sensing mechanism and an output actuator. The former is used to reflect the change in the amount of input, the latter to complete the contact split action (to the contact relay) or the semiconductor component of the on-off (for non-contact relay). The relay has hopping input - output characteristics. When the relay accepts an input signal X, only if it reaches the action value of Xd, the relay moves, and the output jumps from zero to Ymax. The input signal continues to increase, and the output signal remains unchanged at Ymax. After the relay is operated, if the input signal is reduced, the relay moves only when the input is reduced to Xf, returns to the starting position, and the output signal jumps back to zero. This property is called relay characteristic. Here, the relay began to input the value of actions (action value), th