Why don't birds afraid of high voltage electricity

The high -voltage line conveys the power supply for us to save electricity loss and facilitate our lives, but it will also cause the danger of electric shock. In recent years, the safety accident caused by electric shock occurred from time to time, but there was a phenomenon that made us very curious. Why is the bird standing on the high -voltage line but nothing? First of all, high -voltage lines and zero lines (ground lines). Only when fire lines and zero lines (or ground lines) form a closed circuit, the circuit is passed through the circuit. If a person comes into contact with a fire line without other insulating, one part of the body and the earth will form a conductive circuit with the earth, and the current flows through the human body to shock; The zero line allows a certain current to flow from the body, causing an electric shock accident.

The physical quantity that indicates the strength of the current is current, which is represented by I, the unit of the unit; and to allow a section of the circuit to have a current, the two ends must have voltage and form a closed circuit. Indicates that the unit volts; the resistance is used to represent the size of the conductor to the current obstacles. The larger the conductor resistance, the greater the conductor the current obstacle to the current, the resistance of the resistor, the unit Ohm. The voltage on the wire is zero. Birds standing on the high -voltage line are standing on a wire, and they do not contact the ground. It is equivalent to connecting the wires between the birds through the wires between the two claws and the paws, so the bird can stand on the rod safely and soundly.

However, the birds are not absolutely safe. If the bird's wings, tails or mouths touch the transmission iron tower, it will become very dangerous, that is, the birds will also contact the neutral line and the fire line at the same time, which will form a circuit current The current passes from the bird's body, then the electric shock dies. Because the voltage between the wires and the tower is very high, when the bird is touched by the tower, the high -voltage arc will burnt it. At the same time, it will cause power outage due to a short circuit, causing economic losses.

And if the snake climbing to the wire is different, the snake's body is relatively long. When it crawl to the high -voltage line, it will connect the two fire lines and the zero line to cause electric shock to die.

Author: Zhao Sheng

Source: Shaanxi Science and Technology News

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