Relay in Electrical control and power system




Relay 

Relay is a very important device or component used in electrical and electronics systems. Relay is used always everywhere. If this is house hold, Automotive, Industry, Locomotive, plane or any other electrical system; relay will be everywhere.

Relay have different types and shapes. They are basically electro-mechanical or electromagnetic devices used in all electrical or electronics systems. Relay basically acts like a switch which is electrically controlled. In very simple form a relay it can be single pole single through type. In which there could be a pair of contacts making a normally open or normally closed switch which could be activated by an electromagnetic coil and a spring.

How a Relay functions

 A relay is working like a switch. The ordinary switch is activated through your finger whereas a relay is activated through electromagnetic coil and is activated electrically. There is one electromagnetic coil in a relay which activates a switch. The coil is energized or magnetized through electricity. The electricity to the coil can be AC or DC. The voltage value depends upon the relay design. There are different voltage values for relay coil like 5V, 12V, 24V, 48V, 110V or 220V AC or DC depends upon the situation and requirement. This is important to use specific relay with specified coil voltage on that same voltage value otherwise the relay coil may damage.

There is another important parameter for a relay is the relay contact current and voltage rating. This parameters again depends upon relay construction and requirement. There are different ratings like 5A, 10A, 15A, 20A, 50A, 100A, 120A etc. So you should use a relay under the specified current rating for a specific relay to keep it in safe operation condition.

Relay uses

 Relay is used everywhere in electrical systems. Relay is there in your TV, Refrigerator, stabilizer, car, changeover switch, power supply almost everywhere you can think of. The relay is used in all automated systems where switching is occurred. It is a must for everybody to understand a relay. If you understand one relay, others will become easy for you. So it is better to understand any relay so that you will be able to understand many other as well.

Relay price

 Relays are in different price range. You can purchase any relay of your choice or requirement. It starts from 5 relays a $ to $$$ a relay! Good news is household relays are not very expensive. You can get them for very low cost. The one which I used in this project is 1$ relay.
 

Comments

  1. Hudson ElectricalDecember 31, 2019 at 2:07 PM

    There are some interesting points in time in this article but I don’t know if I see all of them center to heart. There is some validity but I will take hold opinion until I look into it further. Good article.
    Sydney Electrician

    ReplyDelete

Post a Comment

Popular posts from this blog

Microwave oven front panel keypad repair and modification

Image
Here is the video on youtube. You must watch it if you are a Urdu to Hindi viewer: Here is the video on youtube. You must watch it if you are an English viewer: The microwave oven is a useful machine to preheat or cook food. The microwave oven is working reliably but now a days Chinese microwave oven have big front panel keypad failure. The keypad is breaking down in one year of less time. The repair is not easy and sometimes the replacement parts are not readily available then it becomes another problem. The solution to such a problem is a modification with existing easily available parts and some wire connections to the main board. The modification is a very robust an reliable work so that will never break down or if breaks down, the repair would be way easy and low cost. Here is a little detail with images is included for such a modification work. Most of the images are from the video associated with this blog post. Anyhow it will further explain the important...
Read more

Sandwich maker or sandwich grill repair and maintenance

Image
Here is a youtube video covering all these details in video: Sandwich maker or sandwich grill is a common house hold electrical appliance used in every house and every facility. They are daily use electrical appliances. They are of different make and model. One thing is common in all of them is the heating element and a sort of temperature controlling switch operated on some preset or selectable temperature range. The heating element are heated by line power and are switched off when the desired temperature is reached. By that way the grill or heating plate is heated and the toast put there is also grilled or heated by that temperature. Sandwich makers or sandwich grill are reliable equipment but some times they develop troubles. The result is no heating grill or heating plates. Normally there are electrical connection problem or temperature controlling switch problem. The heating element failure is also possible but that is a rare fault. So if a grill or sandwich ...
Read more

TP4056 li-ion 3.7v battery 18650 Charging Module Detail, Pinout and datasheet

Image
 In this text I will discuss about the famous TP4056 charging module which is a 3.70V  Li-ion battery 18650 in detail. The pinout, characteristics, setup and calibration for battery value will be covered in this text. TP4056 charger module is a very tiny size module to charge li ion batteries that it can fit anywhere inside any electronic equipment or instrument. TP4056 module consists of a single chip IC TP5640  and a few other supporting components which makes high quality and precision charging module which gives complete solution to automatically charge li-ion batteries of any small size. Using TP4056 module to charge the li-ion battery, it provides full battery life and effective charging to prolong battery life with great efficiency. Using TP4056 battery charging module you can make the line powered equipment less power consuming and the old equipment using dry cell can be converted to rechargeable battery solution. TP4056 Charger or charging module TP4056 Charging ...
Read more