Hello friends, today’s article is about how earthing works and how many types of earthing work.
What is Earthing:
When there is a fault in the machine or any electrical system, with the help of earth, the surge current goes to the ground, thus with the help of earth, we and Machi get protection.
How The Earthing System Works.
We can understand this very easily.
Example: Anyone is a motor. Understand that we have not earthed it and there is an electrical fault in this motor. Will pass through the body and suppose this time someone touches the body even by mistake then he feels terrible grief.
But if we had earthed the body properly, this current would have easily gone into the ground with the help of earthing wire.
Why Don’t We Feel Current By Doing Earthing?
There is no rule for the current to pass through the low resistance side. Our body’s resistance is 1000 ohms or more.
But the resistance of the earthing we do is from 1 ohm to 5 ohms. Suppose that the current in the state of fault does not pass through our body and passes through this earthing. Why is the resistance of our body 1000 ohms and the current always? The lower side flows.
How Earthing Is Done.
Earthing is a very simple task involving the body of a motor or any equipment attached to the ground,
Understand By Example: We know that the body of a motor is made of a substance like iron or steel. To do earthing we attach this body to the ground. If a fault condition touches the body of the motor then the current will go to the ground with the help of this earthing wire instead of going through the body.
Types of Earthing:
Earthing is usually done in 5 ways which are as follows.
- Strip And Wire Earthing.
- Rod Earthing.
- Pipe Earthing.
- Plate Earthing.
- Coil Earthing.
- Chemical Earthing
Strip and Wire earthing:
Strip and Wire earthing This etching is done in a place where the ground is rocky which means there is more rock in the ground. This earthing is widely used in long-distance transmission lines.
This type of earthing is done by digging very deep in the sandy area as the moisture content is high across the sandy place. That’s why we use Pipe Earthing in this.
This is the most commonly used earthing in which we put a pipe 5 to 10 feet into the ground.
Plate Earthing is considered to be the best earth. This is used in substation and power station Plate Earthing Nose. Such earthing is used in places where a large number of current flows.
Coil earthing is used in the smallest amount. This earthing uses a coil made of G.I wire. Such earthing is mostly used for electric poles.
What should be the earthing resistance?
Earthing is used to protect us and our equipment. The lower the resistance of the earth, the better. The best earthing is 0 ohms but this is not possible.
Earthing resistance of power plant. 0.5 ohms or less is kept
The earthing resistance of the substation is kept at 2 ohms or less
The earthing of the L.T pole is kept at 5 ohms or less.
The air resistance of the house is considered to be 8 ohms or less.
How to reduce Earthing resistance:
1. Maintain Moisture of earth: Water is used to retain soil moisture so water is poured into the earthing point from time to time.
2. Increase Contact Area of Electrode: Earth resistance can also be maintained by increasing the thickness of the rod used in earthing.
3. Increase Depth of Electrode: Earth resistance can be reduced even if this electrode is placed at a greater depth while earthing.
4.Use of Salt and Coal in Earthing: Salt and coal can be applied to the place where the electrode is inserted in the soil to maintain soil resistance for a long time.
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