Hello everyone, and today we will talk about a bird on a power line wire.
So why doesn't the bird get an electric shock if it sits on a high-voltage power line wire?
We know that voltage is a potential difference. And when the bird is on the same wire with its legs, the potential difference between the legs will be equal to 0. Because there will be the same potential between two adjacent points on the wire.
The above is well illustrated in the figure below. We see the same potential between the two legs equal to 10,000 V. And the potential difference between the two legs (two points) will be equal to: U = 10,000 - 10,000 = 0 Volts. So, according to Ohm's law, the current flowing through the bird's body will also be equal to 0 A: I = U / R = 0 / R = 0, where R is the resistance of the bird's body.
But as soon as a bird touches one and the second wire with a swing of krill, it will immediately fall under the line voltage (in our case, it is 10,000 volts) and immediately die. The figure above also shows this option.
Basically, large birds, for example, storks and eagles, die in this way, which, moreover, with their harmless wingspan, can disrupt the power supply of entire villages and towns and even cities!
To prevent this from happening as much as possible, special bird protection devices are installed (see the figure below), which are not let the birds sit on the power line and connect with their wings the grounded part of the power line structure and the wire and get under voltage.
But what if the bird sat on the wire with only one paw? Will she be electrocuted in this case?
Answer: she will not be electrocuted either!
It seems that in this case, at one point the potential is 10,000 Volts, and at the second, it is as if 0 Volts (the second leg is in the air) - nevertheless, the current will not flow, because there is no path for the current - it has nowhere to flow! In other words, there is no closed circuit. The current will not flow into the air!
But what if a person also wanted to be like a bird and sit on a high-voltage wire?
You will not turn off an entire village or even a city from the power supply in order to carry out the same routine maintenance or repair work on the power transmission line. In Western countries, a specialist is delivered to the power line wires, as far as I know, by helicopter, and in the CIS countries with the help of an insulating stand. That is, people rise in this case from the ground, but the stand itself is isolated from this earth.
The answer here is also simple, a person who, moreover, is in a special suit, will also not be electrocuted if he is on the same principle as a bird sitting on a wire.
But, but there is a but! The person will be affected by an electric and magnetic field. And for the human body - being in such fields has a negative impact on health (there is enough evidence for this in medical journals - he himself was interested in the evidence base this).
And she is a small bird - she sat down, sat down, as they say. And the human body is much larger and it must constantly work in such conditions.
Therefore, a specialist who works in such conditions must wear special shielding suits (for example, as in the picture above).
Everything that is written above for people is true for trained and trained individuals. They themselves know how to sit or hang on a wire if necessary. For ordinary people, I strongly advise against entering the power transmission line security zone at all, let alone "hanging on a wire like a bird"
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