Take you to understand the principle and use of intermediate relay, thermal relay, time relay and solid state relay
Release Time：
2022-10-20 17:09
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A relay is an electrical control device that can give a specified input and hold it long enough to cause a predetermined step change in the controlled quantity in the electrical output circuit. When the input is reduced to a certain level and maintained for a long enough time, it can be restored to the initial state.
Back in the 18th century, scientists thought that electricity and magnetism were two separate physical phenomena. In 1820, Danish physicist Oster discovered the magnetic effect of electric current, and in 1831, British physicist Faraday discovered the phenomenon of electromagnetic induction. These discoveries proved that electrical and magnetic energy could be converted into each other, laying the foundation for later electric motors and generators; With these inventions, human beings entered the age of electricity. In the 1830s, American physicist Joseph Henry invented the relay using the phenomenon of electromagnetic induction while studying circuit control. The earliest relay is electromagnetic relay, which uses the phenomenon of magnetic force generation and disappearance of electromagnet under power on and power off to control the opening and closing of another circuit with high voltage and current. Its appearance enables the remote control and protection of the circuit to be carried out smoothly. Relay is a great invention in the history of human science and technology. It is not only the basis of electrical engineering, but also the important basis of electronic technology and microelectronic technology. A relay is an electrical control device that can give a specified input and hold it long enough to cause a predetermined step change in the controlled quantity in the electrical output circuit. When the input is reduced to a certain level and maintained for a long enough time, it can be restored to the initial state.
Back in the 18th century, scientists thought that electricity and magnetism were two separate physical phenomena. In 1820, Danish physicist Oster discovered the magnetic effect of electric current, and in 1831, British physicist Faraday discovered the phenomenon of electromagnetic induction. These discoveries proved that electrical and magnetic energy could be converted into each other, laying the foundation for later electric motors and generators; With these inventions, human beings entered the age of electricity. In the 1830s, American physicist Joseph Henry invented the relay using the phenomenon of electromagnetic induction while studying circuit control. The earliest relay is electromagnetic relay, which uses the phenomenon of magnetic force generation and disappearance of electromagnet under power on and power off to control the opening and closing of another circuit with high voltage and current. Its appearance enables the remote control and protection of the circuit to be carried out smoothly. Relay is a great invention in the history of human science and technology. It is not only the basis of electrical engineering, but also the important basis of electronic technology and microelectronic technology.
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The relay coil is represented in the circuit by a long box symbol, and if the relay has two coils, two long boxes are drawn side by side. At the same time, mark the relay word symbol "J" in or beside the long box. There are two ways to represent the contacts of relays: one is to draw them directly on one side of the long box, which is more intuitive.
