Signal relays that you do not understand

Relays are commonly used electrical appliances in automatic control systems. They are used to turn on and off circuits, to issue control commands and to reflect the status of equipment to form automatic control and remote control circuits. They are important components in railway signals. It plays an important role regardless of whether it is the core component of a relay signal system or an interface component of an electronic or computerized signal system.

With the rise of the railway automation internet of things, the relay, a common electrical appliance, has once again entered everyone's discussion topics. What role does it have?

The role of signal relay 1) to expand the control range. For example, when the multi-contact relay control signal reaches a certain value, the multi-circuit may be switched, disconnected, and connected at the same time according to the different forms of the contact group.

2) Zoom in. For example, sensitive relays, intermediate relays, etc., can control very large power circuits with a very small amount of control.

3) Integrated signal. For example, when a plurality of control signals are input to a multi-winding relay in a prescribed form, after a comparison and synthesis, a predetermined control effect is achieved.

4) Automatic, remote control, monitoring. For example, relays on an automatic device, together with other electrical appliances, can form a program control circuit for automated operation.