High voltage electricity is very harmful to the human body, why is the bird standing on it safe

Because the bird is on it, no matter how high the voltage is, but it does not touch the other level, there is no potential difference, there will be no lethal current, so there is no danger to life, hehe.

Because the wire is divided into two wires, the zero wire and the fire wire, which can be regarded as the positive and negative poles, one of them when the bird touches it, the current cannot flow back and forth on the bird.

The high voltage is in a certain area, and the voltage is in a circle around the center of the voltage, a bit like a mosquito coil. The loops closer to the center have a higher voltage, so the voltage varies from turn to circle.

The reason for the formation of the current is that the voltage at both ends of the wire is not equal, the reason why the high voltage will cause people to be electrified is because the current passes through the human body, the person walks with two legs alternately one before the other, when entering the high-voltage area, it is like stepping on the two inner and outer rings of the mosquito coil, and the human body makes a wire to make the current pass through, of course, electric shock. Just like a battery has positive and negative poles, we are like wires, two legs are connected to two ends, and we are naturally electrocuted.

The bird, on the other hand, is jumping and walking, with both legs stepping on the same wire, and the voltage is the same. It's as if both ends of the wire are connected to the negative pole, so no current is generated.

We all know that electricity is divided into positive and negative poles. When a conductor is connected between the positive and negative poles, an electric current flows through the conductor. Similarly, wires are also divided into positive and negative wires.

The human body is a conductor, the human body is larger, when it touches the wire, the two wires are connected together, forming a short circuit, and there is a large current flowing through the human body, which is the reason for the electrocution. Due to the small size of the bird, it only touches one wire, its body is equipotential to the wire it is standing on, and no current is passing through its body (it only touches one wire and there are no other conductors or earth connections), so they will not be electrocuted.

However, if the snake climbs on the power line, it is dangerous, its body is long, and when it climbs on the high voltage line, it will connect the positive and negative two together, causing electrocution. Rats that burrow into power distribution rooms are also often electrocuted to death.

We also know that the live operation of electrical workers on high-voltage lines is the same as that of a bird standing on a wire, so it can be operated safely.

The reason why the bird did not have an electric shock accident when standing on the high-voltage power line is because; Feet when the bird stands on the wire.

There is no large voltage formed at both ends. So the little bird stood on the high-voltage power line and did not have an electric shock accident.

If a person stands on a high-voltage power line with two feet like a bird, he will not be electrocuted; Coincidentally, even if a person stands on a single wire, the clan branch will not be electrocuted. The reason is very simple, and one of the necessary conditions for electric shock is to be part of the current loop.

Because the bird's body is small, usually the bird's two paws stand on the same wire, without touching the earth, which is equivalent to the bird's body and the wires between the two feet in parallel, and will not hook two wires at the same time, will not constitute a current loop, the current through the bird's body is almost zero, so the bird's will not be electrocuted.

High-voltage lines. Precautions and key points to note:

There are many heated discussions and rumors caused by high-voltage lines on the Internet, causing childhood leukemia.

Induces cancer. Causing miscarriages, fetal malformations, etc., the high-voltage line has become a "man-eating tiger". So, is the high-voltage line really a "radiation monster"? The answer, of course, is no, high-voltage line substations do not produce harmful radiation.

China's power industry frequency (referred to as power frequency) is 50 hertz (Hz) and the wavelength is 6000km. It is characterized by low frequency and long wavelength. When conductors such as high-voltage lines and power distribution devices in substations are operating, there will be power-frequency electric fields and power-frequency magnetic fields around the conductors.

Therefore, the high-voltage line substation does not produce harmful radiation, and only the power frequency electromagnetic field exists around.

The above content reference: Encyclopedia - high-voltage wires.

Theoretically, if the stool is firmly fixed on the high-voltage line, the distance between the feet is small enough, and the distance between the feet is large enough to keep a large enough distance from other objects, the person can also stay on the high-voltage line.

Of course, it must be used to fly up, and there must not be any non-equipotential objects in contact. This is because the impedance of the line between the two feet is much smaller than the impedance of the human body (or bird), just like a wire with an electrical appliance - the electrical appliance (human bird) is shorted.

A few years ago, Shandong produced the first person to work on ultra-high voltage live electricity, that is, under the premise of equipotential operation, he climbed the transmission tower (more than 60 meters high) of the 660kV DC transmission line to install a pin.

In this strong electric field environment, machine operation cannot be realized, and there is no other way but manual operation. Even if it is an equipotential operation, the slightest carelessness can be explained, and the result is that the maintenance work is successfully completed.

Equipotential, i.e., equal potential. If two test points are selected in a live line of Zaoqingqiao, and there is no voltage between them, that is, there is no potential difference, then we determine that the two test points are equal potential, and there is no resistance between them.

In the power system, the equipotential is represented by a downward hollow triangle symbol, which actually means grounding.

Equipotential bonding in construction is to connect the exposed metal and conductive parts of electrical installations and other devices in the building with conductors with artificial or natural grounding bodies to reduce potential differences.

Equipotential bonding includes total equipotential bonding, partial equipotential bonding, and auxiliary equipotential bonding.

The power supply is divided into positive and negative poles. When a conductor is connected between the positive and negative poles, an electric current flows through the conductor. The human body is a conductor, the human body is larger, when it touches the live wire and the neutral line, the two wires are connected together, forming a short circuit, and there is a large current flowing through the human body, which is the reason for the electrocution of the person.

Why is it that if the voltage on the conductor is almost 0 when using a voltmeter to measure the voltage on the conductor when doing electrical experiments? Because the resistance of the wire is basically 0, the voltage of the wire is very small and almost 0 from Ohm's law. Due to the small size of the bird, it only touches one wire, and its body is connected in parallel with the wire it is standing on, and it can also be considered that the wire has shorted the bird, and there is no current passing through the body, so they will not be electrocuted.

Security. Generally speaking, the effects of high-voltage electricity on the human body are electric shocks and electromagnetic waves. When working around the high-voltage electricity, there should be appropriate protective measures and keep a safe distance, otherwise the high-voltage electricity should be cut off first before construction, so as to avoid death by electric shock.

The overhead power line protection zone is a safety area that must be set up to ensure the safe operation of the overhead power lines that have been built and ensure the normal electricity consumption of people's lives. In densely populated areas such as factories and mines, towns, market towns, villages, etc., the overhead power line protection zone is the area within the two parallel lines formed by the sum of the horizontal distance of the conductor edge after the maximum calculated wind deviation and the horizontal safety distance from the building after the wind deviation.

The above content reference: Encyclopedia - High Voltage.

76.The moment the woodpecker touched the high-voltage electricity, it disappeared directly out of thin air, and its body disappeared.

<> high-voltage power lines are so dangerous, why can't a bird get electrocuted when standing on it? Modern power transmission systems are the result of painstaking calculations and designs by scientists to ensure the efficiency of power energy delivery, and the principles are mainly based on high school physics. High efficiency means that the loss of power through the transmission process is minimized, and this loss is mainly due to the presence of resistance in the transmission line, the loss of power due to the thermal effect of the current.

There are two main measures to reduce heat loss in the power transmission process, firstly, the power generated by the power station is raised to a very high transmission voltage, and for the transmission of a certain power, the higher voltage will produce a smaller current due to p=iu. Secondly, the material selection of the transmission line mainly considers the conductor with excellent resistance, copper and aluminum are the most commonly used metals in the transmission line, and further reduce the resistance of the wire by thickening the wire and increasing the cross-section, because the power loss in the wire is proportional to the resistance r of the transmission line, p loss = i square r, the lower the resistance, the smaller the power loss.

First of all, what is an electric shock? An electric shock is when an electric current flows through a person's or animal's body and causes harm to the body. Well, the most effective way to prevent electric shock is to avoid the current passing through the body.

Secondly, how is the current generated? The two conditions for generating the current are: the first circuit must be closed, and the second must have a potential difference, i.e., electromotive force.

Finally, the swallow stands on the wire with both legs, which can be seen as the swallow forming two parallel circuit branches with the wires between the swallow's legs. Depending on the characteristics of the parallel circuit, the greater the resistance on the branch, the smaller the current flowing. If the resistance on one branch is much smaller than the resistance on the other, then there is almost no current flowing through the high-resistance branch.

This is the tendency of the current to be impedient.

Now, we can analyze why swallows standing on the same high-voltage power line will not be electrocuted according to the above three points. Because, the same high-voltage wire, its phase is the same phase, there is no phase difference, which is why the swallow will be electrocuted if it stands on two wires. The resistance of high-voltage wires is very small, while the resistance of humans or animals (including swallows) is much larger.

In addition, the distance between the two feet of the swallow is small, and the resistance of the wire between the two feet on which it stands is even smaller, and the resistance ratio of the swallow's body can almost be ignored. Therefore, the current will only flow through the wire between the feet, not through the swallow's body.

The reason why the bird will not be electrocuted when standing on a high-voltage line is because the bird is small and stands on a wire, which does not generate a current loop, so the current does not pass through the bird's body. Generally, the premise of electric shock is to generate a certain current, and the current generation must have a complete circuit

The size of the bird is relatively small, which will not cause the current loop of the wire, and there is an insulator on the surface of the high-voltage wire.

The size of the bird is very small, and it does not generate an electrical loop, nor does it generate electricity in the bird's body.