Is it dangerous for people to touch the ground wire of the lightning rod during a thunderstorm?

Summary. lightning rods, lightning cables and lightning arresters, etc.), which are used to eliminate or mitigate lightning hazards and damage to equipment caused by lightning to the earth. This type of grounding is protective grounding, because it belongs to lightning protection grounding.

Are lightning rods and lightning wires working grounding or protective grounding and why?

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lightning rods, lightning cables and lightning arresters, etc.), which are used to eliminate or mitigate lightning hazards and damage to equipment caused by lightning to the earth. This type of grounding is protective grounding, because it belongs to lightning protection grounding.

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Is it possible that the lightning rod and lightning cable are working grounding?

No, it's basically protective grounding.

When you hear thunder on a rainy day, it means that lightning has occurred, and you need to take quick steps to ensure your safety. In thunderstorms, the farther away people are from the site of the thunderstorm, the safer it is, but there is no definite safe distance.

It is generally accepted that when the distance between the lightning bolt and your location is less than 30 seconds of walking time (about 5 kilometers), you should take the necessary precautions, such as hiding indoors or in a car as soon as possible. If there is no place to take shelter, stay away from conductors such as tall trees, metal objects, tall buildings and water, find low-lying places or gentle terrain to take shelter, do not lie on the ground or near metal objects, avoid contact with any conductors connected to the ground, and keep your heels on the ground.

It should be noted that this is only a basic reference distance, and the specific safety distance also needs to be judged according to the specific weather conditions and on-site conditions to ensure the safety of individuals. In the filial piety of the thunderbolt model, do not take it lightly, and should always be vigilant to avoid unnecessary risks.

OK. When the direct lightning grounding down conductor adopts the building structure steel bar, it must not share the down conductor with other grounding systems, so that the ground potential counterattack will occur, and the lightning damage equipment will be introduced by the grounding wire of each system. However, the ground grounding device can be shared, as long as the grounding point of the down conductor is staggered at a certain distance.

Is it right to connect the ground wire and the lightning rod wire together? Today is a long time to see.

The lightning rod should be equipped with its own separate grounding device, and then connected with other external ground wires, rather than relying on another ground wire to discharge. Because when lightning hits the lightning rod, the current flowing through the lightning rod is very large, if there is no lightning rod's own separate grounding device equalization, the stepping voltage around the lightning rod is very high, which will endanger personal safety. Therefore, be sure to set up a separate closed grounding device in the lightning rod.

The lightning rod of the building is used to protect lightning, but it is actually lightning, and the professional name of lightning rod is: lightning receiver. It is a method of guiding lightning to avoid lightning strikes on surrounding buildings.

Therefore, it is generally at the top of the building, and the construction is very high. And there are tips. When lightning strikes, there will be a strong magnetic field near the bottom line, which can easily cause induced lightning and cause damage to household appliances.

The lightning rod of the building is grounded.

The grounding resistance of the wire.

The value is generally very low less than 1 ohm, according to this requirement, the socket grounding and sharing is also possible. However, considering that the grounding wire of the lightning rod may be damaged, or the resistance value becomes high, it is not safe for others to reconnect it.

Is it dangerous for people to stand under the needle of the thunder when thunder? Will there be dead people? (The lightning rod is well grounded) - If there is lightning hitting this lightning rod directly, it will form a strong electric field on the grounded ground.

If you stand with two feet in a step, there will be a high voltage between the feet, which is called the step voltage. Enough to knock people down.

Is it dangerous for a human hand to touch a lightning rod during thunder? (lightning rod is well grounded) can it kill people?

A great way to commit suicide. Touch it with your hands, not only knock down, 9 into hang up.

Yes! bai

In a thunderstorm, when there are charged clouds over high-rise buildings, the thunderbolt and the top of the high-rise buildings are sensed in large quantities.

The electric charge, which is accommodated by the lightning rod needle, is pointed, and when electrostatic induction, the tip of the conductor always gathers the most charge In this way, the lightning rod gathers most of the charge The lightning rod forms a capacitor with these charged clouds, because it is sharper, that is, the area of the two pole plates of this capacitor is very small, and the capacitance is very small, that is to say, it can hold very little charge And it gathers most of the charge, so when there is more charge on the clouds, the air between the lightning rod and the clouds is easy to be broken down and become a conductor In this way, the charged cloud layer forms a passage with the lightning rod, and the lightning rod is grounded again The lightning rod can guide the charge on the cloud layer to the earth, so that it does not pose a danger to the high-rise building, and ensures its safety

If the lightning rod is touched by human hands during thunder, the electric charge will pass through the human body and lead to the earth, causing **.

Yes, if there is only a little grounding, then the stepping voltage generated by a lightning strike in an instant is enough to kill a person in the vicinity of the grounding point.

However, most of the current buildings are framed buildings (I don't care about the 2 or 3 floors of brick and concrete), and there are many grounding points, which are enough to form a Faraday cage in the building (Note 1). Keeping people from harm.

However, the building still has a stepping voltage near the grounding point on the surface of the land, so if it is outside the house, do not get too close.

Note 1: A Faraday cage is a cage made of metal or good conductors. It is named after the British physicist Michael Faraday, the founder of electromagnetism, and is a device used to demonstrate the principles of equipotential, electrostatic shielding, and high-voltage live operation.

It is composed of a cage, a high-voltage power supply, a voltage display and a control part. Its cage is connected with the earth, and the high-voltage power supply delivers 100,000 volts DC high voltage to the discharge rod through the current limiting resistance, when the tip of the discharge rod is 10 cm away from the cage body, a discharge spark appears, according to the condition of the electrostatic balance of the grounding conductor, the cage body is an allitope, the internal potential is zero, the electric field is zero, and the charge is distributed on the outer surface close to the discharge rod.

Yes, otherwise, the grounding wire of the first-level lightning protection will not require that it must be three meters away from the building.

Yes, the grounding resistance of the lightning rod must meet the requirements, so that it can only reduce the step voltage, but not eliminate the step voltage, so it is forbidden to stand under the lightning rod when thundering.

There will be danger, under the lightning rod used in the lightning protection system, there will generally be a strong lightning grounding network, which is not a factory or power station. And the grounding network is generally set in a relatively hidden place, and most people will not go to the **.

A stepping voltage will be formed, so the grounding body is generally 3 meters away from the pedestrian crossing, if less than 3 meters1. The insulator will be wrapped in the grounding body locally, and the asphalt layer 2 of 50-80mm can be used, and the local buried depth of the horizontal grounding body should not be less than 1m

3。Asphalt gravel flooring is used.

If exposed, there is a certain danger.

During thunderstorms, you should not stop at the following places: mountain tops, ridges, open fields, various open-air parking lots, sports fields and the tops of buildings; near lightning rods and their down wires, under isolated trees, in pavilions; Iron fences, near overhead lines.

A lightning arrester is actually a type of lightning arrester. When there is a lightning high voltage, it is broken down (shorted), introducing the high voltage (lightning) into the ground, thus protecting the line from the attack of high voltage. It has both electrical breakdown and thermal breakdown.

It can be recovered when an electrical breakdown occurs. However, it cannot be recovered in the event of a thermal breakdown. After the occurrence of thermal breakdown, it can not play a protective role, and the arrester must be replaced.

The main types of arresters are tubular arresters, valve-type arresters and zinc oxide arresters. The main working principle of each type of arrester is different, but their working essence is the same, all of which are designed to protect communication cables and communication equipment from damage.

Tubular lightning arrester.

The tubular arrester is actually a kind of protection gap with high arc extinguishing ability, which is composed of two series clearances, one gap is in the atmosphere, called the outer clearance, and its task is to isolate the working voltage and avoid the gas production pipe from being burned out by the power frequency leakage current flowing through the pipe; The other is installed in the trachea, called the internal clearance or arc extinguishing gap, and the arc extinguishing capacity of the tubular arrester is related to the size of the power frequency freewheel. This is a kind of protection gap type lightning arrester, which is mostly used in power supply lines for lightning protection.

Valved surge arrester.

The valve-type arrester is composed of a spark gap and a valve resistor, and the valve resistor is made of special silicon carbide. Die resistors made of silicon carbide can effectively protect against lightning and high voltage, and protect equipment. When there is a lightning high voltage, the spark gap is broken down, and the resistance value of the valve resistor decreases, which introduces the lightning current to the earth, which protects the cable or electrical equipment from the harm of lightning current.

Under normal circumstances, the spark gap will not be broken down, and the resistance value of the valve plate resistance is high, which will not affect the normal communication of the communication line.

Zinc oxide arrester.

Zinc oxide arrester is a lightning protection equipment with superior protection performance, light weight, pollution resistance and stable performance. It mainly uses the good nonlinear volt-ampere characteristics of zinc oxide to make the current flowing through the arrester at normal operating voltage very small (micro-ampere or milliampere level); When the overvoltage acts, the resistance drops sharply, dissipating the energy of the overvoltage to achieve the effect of protection. The difference between this arrester and the traditional arrester is that it has no discharge gap, and uses the nonlinear characteristics of zinc oxide to play the role of discharge and breaking.

The above introduces several lightning arresters, each of which has its own advantages and characteristics, and needs to be used for different environments in order to have a good lightning protection effect.

When the arrester is intact and there is no inrush current in the power system, it will not cause the line to be grounded. And when the arrester fails, for example by a permanent breakdown, the line is grounded. Of course, when the arrester discharges the inrush current, it is essentially grounded, and the lightning and inrush energy are discharged into the ground for dissipation, which is allowed.

In the event of a breakdown fault in the arrester or when the voltage used by the arrester exceeds the threshold voltage, it will be directly grounded and discharged; The surface of the arrester is seriously dirty, which will reduce the ground resistance of the line and make it unbalanced. For example: a construction site 10kV power supply system, the cable together with the ring network switchgear insulation resistance test, the test results are low and unbalanced, according to this result does not meet the power transmission conditions, into the ring network switchgear lightning protection surface cleaning and wiping, the final test results meet the requirements.

Therefore, the arrester will not be to the ground under normal circumstances.

Terminology version: Grounding wire refers to the connecting conductor from the down conductor disconnection card or changeover to the grounding body, or from the grounding terminal, equipotential connection belt to the grounding body.

Speaking version: The lightning protection device is composed of two parts: the external lightning protection device and the internal lightning protection device, so the grounding wire is divided into two situations

Outside the building, lightning flows into the ground through the lightning receiver (lightning rod, belt, net, wire, metal object) - down conductor - grounding device, and the surface-mounted down conductor is provided with a disconnect card, then the section from the flash connector to the disconnect card is called the down wire, and the section from the disconnect card to the grounding device is called the grounding wire.

Inside a building, the metal wire from the local or total equipotential connection plate to the grounding device is called a grounding wire. For example, a copper bar will be set up under the anti-static floor of the computer room, which is the total grounding in the computer room, and the metal wire from this copper bar to the grounding flat steel in the electrical shaft, or directly to the grounding body, is the grounding wire.

To put it simply, the grid on the roof is composed of round steel or flat steel, and the part used to withstand direct lightning strikes is the lightning protection net, and a piece of metal wire drawn from the grounding device in the soil is called the grounding wire. PS: The term lightning net has disappeared and is now called a lightning net.