What is a step voltage and what is a step voltage

If people or livestock stand within 8 10 meters of the landing point of the power line. An electric shock accident may occur, and this electric shock is called a step voltage electric shock. When a person is subjected to a stepping voltage, although the current is along the lower body of the person, from the feet through the legs, crotch and then to the feet and the earth to form a pathway, it does not pass through the vital organs of the human body, it seems to be relatively safe.

But that's not the case! Because when a person is subjected to a higher stride voltage, his feet will cramp and his body will fall to the ground. This not only increases the amount of electrical current acting on the body, but also changes the path of the current through the body, making it entirely possible for it to flow through vital organs such as head to hands or feet.

Experience has proved that after a person falls to the ground, the electric current continues to act in the body for 2 seconds, and this electric shock will be fatal.

Step voltage electrocution generally occurs when the high-voltage wire lands, but the low-voltage wire should not be paralyzed when it lands. According to the test, when the cow stands in the paddy field, if the stride voltage between the front and back spans reaches about 10 volts, the cow will fall, and the current will often flow through its heart, and the electrocution will be carried out for a long time, and the cow will die.

When a person perceives a threat from a stepping voltage, he or she should quickly put his feet together or jump out of the danger zone with one leg as soon as possible.

Close to the position where the high-voltage line falls to the ground, every step and two steps is different, and the voltage at the position is different, and it is easy to be electrocuted.

Man is standing on the earth where there is an electric current flowing through it, and there is an electric voltage between the two feet.

The so-called step voltage refers to the voltage between the feet of a person walking in the potential distribution area around the ground current entry point when the electrical equipment has a ground fault.

When the electrical equipment touches the shell or the power system is grounded and short-circuited, the current flows out from the grounding electrode in all directions, forming different potential distributions on the ground.

The voltage difference between a person's feet.

What is Step Voltage? Star Awareness Project

Step voltage refers to the voltage between the feet of a person walking in the potential distribution area around the point of ground current entry when a ground fault occurs in electrical equipment.

The principle of stepping voltage: when a live wire of the overhead line falls on the ground, the potential of the landing point is the same as that of the live wire, and the current will be dispersed from the landing point of the wire to the earth, so the ground is centered on the landing point of the wire, forming a potential distribution area, the farther away from the landing point, the more dispersed the current, and the lower the ground potential.

When the stepping voltage is 40-50 volts, the human body is at risk of electric shock. Specifically, the step voltage will cause a person to fall, and then increase the electric shock voltage of the human body, and may even cause electric shock death.

Experimental verification: The verification of the cattle into the dregs shows that when the amplitude of the impulse voltage mode is kilovolts, the step voltage and the contact voltage do not cause any damage to the internal body of the cattle. For example, when the amplitude of the step voltage is increased to 40 70 kV, and the amplitude of the contact voltage is increased to 42 56 kV, the central nervous system and blood circulation function of cattle are affected.

This is a temporary effect that can be fully recovered after rest and is not life-threatening.

Hazards: When the stepping voltage reaches 40 50V, it will make people have the risk of electric shock, especially the stepping voltage will make people fall and then increase the electric shock voltage of the human body, and even make people electrocuted.

What does step voltage mean is introduced as follows:

When the two feet of the person step on the two points of the two potentials are very different, there is a great voltage between the two feet of the person, and the person is a conductor (although not a good conductor), so that there will be a current, the current flows from a point with a high potential to a point with a low potential, and causes an electric shock accident through the human body. It's not just walking, it's not enough to stand on the ground with your feet far apart.

Generally, in the event of a short-circuit accident to the ground, there will be a sharp drop in the potential of the radial radiation around the grounding point near the grounding point, which is a very short distance The potential difference will be very large, and it is easy to have a step voltage electrocution accident.

Step voltage electrocution, that is, near the ground where the high-voltage line touches, a ring-shaped electric field is generated. That is, with the high-voltage line contact point as the center of the circle, there is a radial voltage decreasing voltage distribution from the contact point to the surroundings. It can be understood that the voltage at the center of the circle is equal to the voltage on the high-voltage wire, and the farther away from the center of the circle, the lower the voltage.

Therefore, when a person strides from near the center of the circle to a position away from the center of the circle, the voltage on the two feet is different. In this way, this voltage will generate an electric current through the human body, causing the person to be electrocuted. And the magnitude of the voltage between these two feet is related to the distance of the step:

The larger the pace, the greater the voltage difference.

Stride voltage, as the name suggests, refers to the voltage between the two legs.

When a live wire of the overhead line falls to the ground, the potential of the landing point is the same as that of the live wire, and the current will flow from the landing point of the wire to the earth, so the ground is centered on the wire landing point, forming an electric potential distribution area, the farther away from the landing point, the more dispersed the current, and the lower the ground potential. If people or livestock stand within 8 10 meters of the landing point of the power line. An electric shock accident may occur, and this electric shock is called a step voltage electric shock.

The schematic diagram is as follows:

The influencing factors of this voltage are as follows:1. According to the China Physical Network, the voltage size: the larger the voltage, the greater the step voltage.

2. The grounding mode of the human body: the grounding mode of the human body is different, which has different effects on the stepping voltage. For example, when the two feet of the human body are grounded, the stepping voltage will be greater than when one foot is grounded.

3. Foot distance: The greater the foot distance, the greater the voltage across the step.

4. Ground resistance: Ground resistance has a great impact on the step voltage. When the ground resistance is higher, the step voltage will be correspondingly higher.

5. Soil moisture content: Soil moisture content also has a great impact on the stepping voltage. When the soil contains a higher amount of buried water, the stepping voltage will also be correspondingly higher. Balance and simplicity.

When the electrical equipment has a grounding fault, the grounding current is dispersed to the ground through the grounding body, forming a distributed potential on the ground. At this time, if people are walking around the ground short-circuit point, the potential difference between their feet is the step voltage. An electric shock to the human body caused by a step voltage is called a step voltage electric shock.

When the human body is subjected to the action of stepping voltage, although the human body is not in direct contact with the live conductor, there is no arcing phenomenon, but the current is along the lower body of the person;

From one foot through the crotch to the other, caution forms a pathway with the earth. When you are electrocuted, you will feel numb in your feet first, and then you will fall. When a high step voltage is touched, your feet cramp and you fall to the ground.

After a fall, due to the large distance between the head and feet, the voltage acting on the body increases, and the electric shock current increases accordingly, and it is also possible to change the path of the current through the human body to pass through the vital organs of the human body, such as from head to toe or head to hand.

Therefore, the hazard of electric shock is increased. After the human body falls to the ground, the voltage lasts for 2 seconds, and the person will be in mortal danger. The size of the step voltage is determined by the distance of the human body from the grounding point, the farther the distance, the smaller the step voltage value, and the closer the potential is close to zero at a distance of 20 meters from the grounding point, the higher the step voltage.

The difference between step voltage and contact voltage.

In the system where the distribution transformer is not grounded at the low voltage and neutral point, when a single-phase grounding fault occurs, the grounding current spreads to the surrounding earth through the grounding device and the earth with the grounding point as the center, and at this time, a potential distribution area is formed on the surface of the earth. Obviously, different locations in this distribution area have different pitches for the electric cavity ridges. If there is a grounding fault in electrical equipment such as switches, when the human hand touches the grounding fault equipment shell (or structure, etc.), a potential difference will occur between the hands and feet of the human body, and this potential difference is called the contact voltage.

If the overhead conductor is broken and falls to the ground, when a single-phase grounding fault occurs, if a person walks around the grounding point (in the potential field shooting area), the two feet will be on the ground with different potentials, and the potential difference between the two feet is called the stepping voltage.

The magnitude of the contact hail voltage is related to the distance of the equipment leaving the underground grounding body in the event of a grounding fault. The closer it is to the grounding body, the smaller the contact voltage; Conversely, the contact voltage is greater.

The magnitude of the step voltage is also related to the distance of the person from the grounding body (point); The closer the person stands to the grounding body (point), the greater the lack of stepping voltage; Otherwise, the smaller it is.

What is Step Voltage? Star Awareness Project

The color TV scene is the voltage between the feet when stepping on the wire.

What is Step Voltage? Star Awareness Project

It is when you step a certain distance in a high-voltage environment, so that the electric potential (voltage) difference is formed between your feet, so that the current flows through the body, thus electrocution! Serious contempt for the replicants upstairs!