What is grounding, or just about simple
Kind time of the day, readers.
I read a resource for a long time, a good thing. I decided to bring a little clarity to our life, namely - to a seemingly simple thing - grounding.
Inspired by the article , but after reading the comments, I had doubts crept in - is it clear to everyone about the essence of grounding? I wanted to add something from myself, in simple words, without any PUE. After all, grounding is protection, and therefore - it is important.
So:
')
Why not be content with machine guns alone? Yes, because the response time is not zero for any supercar. Earth is faster than any RCD!
An important role in this is played by grounding (I will not write the word “well-executed according to all GOST” - the topic is designed for a simple understanding of the basis of grounding, and not for studying standards). Here the circuit looks different: the potential accumulates in the clouds relative to the earth and when it reaches a certain value, it is discharged (and here, yes, the current goes into the earth, equalizing the potentials of heaven and earth, for such a circuit). Through conductive materials. Here it is important not through people and equipment. Lightning rods are made, and they are connected to the circuit. Thick pieces of iron to reduce resistance, so that the maximum current flows through the least resistance. But all the same - on extended wires and cables a current will be induced - and not a few volts. The current with volts can burn everything. Here are the help of SPDs. There are arresters, which, when triggered by an increased voltage / current, close all cable conductors to earth.
Such is the brief topic of the basics.
ZY There are great illustrations here.
I read a resource for a long time, a good thing. I decided to bring a little clarity to our life, namely - to a seemingly simple thing - grounding.
Inspired by the article , but after reading the comments, I had doubts crept in - is it clear to everyone about the essence of grounding? I wanted to add something from myself, in simple words, without any PUE. After all, grounding is protection, and therefore - it is important.
So:
')
Grounding - 2 kinds of functioning
one.
Electrically conductive parts of the equipment enclosure (cabinets, etc.) are connected to zero. This, as is rightly suggested, is called “zeroing”. It works in this way: the equipment case is connected to zero, and when a phase hits the case, a short circuit occurs and the automatic knock out. No harm done.2
If there is a ground loop, then the electrically conductive parts of the equipment case and etc. that a person can touch (and any reader of this topic) are connected to this circuit. How does it work? The current does not “leak” and does not “absorb” into the ground, does not leak into the middle point of the transformer windings, little happens to it. In case of a breakdown on the case, everything, incl. and the contour of the building becomes under the same voltage as the building. The contour is connected to the ground (the one we walk by), which means that the person will not be hit by the current - the potentials are equalized in the circuit. Everything becomes under phase.Why not be content with machine guns alone? Yes, because the response time is not zero for any supercar. Earth is faster than any RCD!
About lightning protection
An important role in this is played by grounding (I will not write the word “well-executed according to all GOST” - the topic is designed for a simple understanding of the basis of grounding, and not for studying standards). Here the circuit looks different: the potential accumulates in the clouds relative to the earth and when it reaches a certain value, it is discharged (and here, yes, the current goes into the earth, equalizing the potentials of heaven and earth, for such a circuit). Through conductive materials. Here it is important not through people and equipment. Lightning rods are made, and they are connected to the circuit. Thick pieces of iron to reduce resistance, so that the maximum current flows through the least resistance. But all the same - on extended wires and cables a current will be induced - and not a few volts. The current with volts can burn everything. Here are the help of SPDs. There are arresters, which, when triggered by an increased voltage / current, close all cable conductors to earth.
Such is the brief topic of the basics.
ZY There are great illustrations here.
Source: https://habr.com/ru/post/363217/
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