High-voltage electricity is considered particularly dangerous due to its relatively strong discharge levels. However, there are still a lot of people who still don’t really understand this current. So what is high voltage? Let’s learn more about high voltage electricity through the article below.
What is high voltage electricity? High voltage is known as high voltage, is an electric current with a high voltage level that can be harmful to living organisms and humans, and can even cause death. Many people wonder “how many volts is the high voltage”? The answer is the power line with power supply from 110kV-220kV-500kV. Therefore, manufacturers must ensure equipment and conductors with high safety in accordance with industrial processes, in order to meet high voltage current transmission. In addition, high-voltage electricity also plays an important and necessary role in heavy industries, especially production activities that require large amounts of electricity. This current is delivered in a cathode-ray tube (physical electrode), producing X-rays and particle beams that create an electric arc.

In which, the arc creates electric shock, in the photomultiplier lamp, the electronic lamps inside the high-energy amplifier. Today, high voltage is widely applied in the fields of science and technology.

High voltage safe distance

Knowing about high voltage and safe distance will help ensure the safety of people and creatures around. Electricity law has its own requirements to ensure safe discharge distance for other currents. How to calculate the safe distance through the electrical conductor when in the state of maximum deflection to the highest point of the object to be protected.

The regulated levels for safe distances of high voltage are clearly stated in the Law:

For voltages up to 35kV

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The distance when discharge to the highest point is 4.5m of road vehicles is 2.5m. The safe distance for 4.5m high railway or 7.5m high electric railway traffic works will be about 3m. The technical clearance height of inland waterways will have a safe distance of 1.5m.

For voltages up to 110kV

Discharge safety distance for 110kV voltage up to the highest point of about 4.5m of road vehicles will be 2.5m. The safety distance of the high-voltage grid to the highest point of 4.5m high railway traffic, or 7.5m high electric railway traffic works will be about 3m. The technical clearance height of inland waterways will have a safe distance of 2m.

For voltages up to 220kV

The safe distance for 220kV voltage up to the highest point of about 4.5m of road vehicles will be 3.5m. The safe distance of 4.5m high rail traffic, or 7.5m high electric rail traffic works will be about 4m. The technical clearance height of inland waterways will have a safe distance of 3m.

For voltages up to 500kV

Discharge safety distance for 220kV voltage up to the highest point of about 4.5m of road vehicles will be 5.5m. High voltage electricity, the safe distance when discharging electricity to the highest point of 4.5m high railway traffic, or 7.5m high electric railway traffic works will be about 7.5m. The technical clearance height of inland waterways will have a safe distance of 4.5m.

Answer some questions related to high voltage

Concerned about high voltage current, there are many different questions that people want to be answered in detail. Here are some typical questions that readers can refer to to find the correct answers for themselves.

How far is the house from the high voltage power line?

Pursuant to Clause 3, Article 51 of the Electricity Law, which stipulates: “Article 51. Safety protection of overhead power lines”

“It is not allowed to exist in houses and works where people regularly live and work in the safety corridor of overhead power lines with voltage of 500 kV or more, except for specialized works serving operate that grid”. Accordingly, in the safety corridor of overhead power lines with voltage of 500 kV or more, it is not allowed to build houses.

In case of building houses and works in the safety corridor of overhead power lines with voltage up to 220kV, the conditions specified in Article 13 of Decree No. 14/2014/ND-CP must be satisfied.
If you are looking to find out how many meters high voltage insulation to build, do not ignore the regulations on the distance of the work to the nearest electrical conductor: Voltage Up to 35 kV 110kV 220 kV Distance 3.0 m 4.0 m 6.0 m In addition, when building a house, it is necessary to ensure that the roof and wall are made of non-combustible materials. At the same time, the location of the house does not obstruct the way in and out for inspection and maintenance of parts of the high-voltage grid. Along with that, the metal structures of the house must be grounded according to the regulations on grounding techniques. What material is the high voltage wire made of? The manufacturer uses aluminum wire as a high voltage conductor but must ensure purity to 99.5% to increase the durability of the electrical conductor. Aluminum wire is light weight with low cost, especially less susceptible to corrosion in the air, helping to reduce the weight of high voltage wires by 30%. This is the answer to the question of what high voltage wire is made of? Does high voltage attract people?

According to the electrical engineer, the high-voltage current is not capable of attracting people. If it happens, it may be because the person is standing too close to the high voltage wire, so it is affected by the attraction of the magnetic field.

People who are sucked will have paralysis of limbs, loss of orientation, etc., leading to contact with electrical wires causing shock. Therefore, unauthorized persons must absolutely not approach the area with high voltage currents, to avoid possible unfortunate consequences.

Is the high voltage wire sheathed?

Normally, electrical wires are covered with an insulating layer, but at high voltage there is no sheath. So why is the high voltage wire unsheathed? That is because this current has a large enough discharge distance, so the sheathed conductor does not work.

This process of installing power lines is usually placed very high and no one should get close to the high voltage poles. Air does not conduct electricity under normal environmental conditions. Therefore, high voltage wires without sheath still help insulate from the surrounding environment.

Moreover, the amperage of the high voltage is very large, so the insulation sheath will melt, unable to withstand the impact of extremely large currents. Therefore, the high voltage lines will be in the state of bare wires, mounted on high poles by insulating porcelain chains, keeping a safe distance. High voltage power poles can be centrifugal concrete poles or very tall iron towers.

From the information above, surely you have a better understanding of what high voltage is, right? Hopefully, through this, readers will understand better and keep a safe distance from high voltage currents to protect themselves and their loved ones.