Why do you have to unplug the closed circuit of the TV when it thunders? Can you pull it out? Do I have to unplug the power?

Lightning stroke caused by lightning is a common natural phenomenon in summer. The harm of lightning to human beings is generally divided into three types: direct lightning, lightning wave intrusion and induced lightning strike. Direct lightning refers to lightning directly hitting buildings, trees, the earth, lightning protection devices or human bodies. Direct lightning is accompanied by sound and light, which is aggressive and well known to all ages. Lightning wave intrusion refers to the action of lightning on overhead lines and metal pipelines, which may invade houses along these pipelines, endanger personal safety or damage equipment; However, induced lightning occurs quietly and the consequences are serious. Direct lightning strike is different from inductive lightning strike. Direct lightning mainly damages buildings and power lines on the discharge path, causing human and animal deaths, while inductive lightning mainly damages electronic equipment. Recently, nearly 100 cases of computer users and televisions being struck by lightning in our oilfield were all caused by inductive lightning and the invasion of lightning waves. Experts remind that induction lightning is on the rise and 80% of lightning accidents are caused by it. But at present, people have a poor understanding of this hidden lightning disaster, and many people don't realize how to protect it. In particular, many residential areas are basically lightning protection blind areas. In the past, the traditional concept of lightning protection that lightning rods can be installed on buildings should be changed, and the focus of lightning protection in cities and towns should be on preventing "induced lightning".

Induced lightning is due to the electrostatic induction or electromagnetic induction of thunderstorm clouds, so that metal objects on buildings, such as pipes, steel bars, wires, reaction devices, etc., induce charges opposite to those of thunderstorm clouds, resulting in discharge.

There are three channels for an electronic device to attract induced lightning: 1, antenna and feeder introduction; 2. Introduction of power lines; 3. Introduction of signal lines.

For the electronic equipment group in the building, there are mainly six channels for introducing induced lightning: 1, and the antennas, feeders, power lines, signal lines and grounding lines of all electronic equipment in the building are the lightning entry channels of the building; 2. Connect various power lines and "long" distance signal lines in the building; 3. Lightning shock wave induced by magnetic field eddy current around all metal pipes in buildings with public grounding when direct lightning current flows; 4. Lightning shock wave induced on the metal surface during lightning discharge: 5. Lightning high impact of direct lightning shooting down buildings at lightning strike points; 6. Lightning recoil current when direct lightning strikes down buildings with lightning spots. This kind of current can enter the electronic equipment through the grounding wire of the adjacent building, which will cause discharge between the shell and the movement of the electronic equipment and damage the electronic equipment.

Brother Lu specially reminded residents to turn off household appliances such as computers and televisions as much as possible when it thunders, and unplug power plugs, signal wires and computer network cables to prevent lightning from invading from power wires and signal wires, damaging electrical appliances and causing fire or electric shock death. Try not to make phone calls in rainy days to reduce the damage caused by induced lightning current along telephone lines; Don't use the outdoor antenna of the TV. If lightning strikes the TV antenna, it will spread into the room along the TV antenna, threatening electrical appliances and personal safety. When it thunders, people should not stand under the electric light; Do not open the window in thunderstorm weather to prevent spherical lightning from entering the house; Stick your head out of the window or touch the metal frame of the window with your hand, and you may be struck by lightning; Don't pull the wires for drying clothes and bedding to windows, doorways and lightning protection downlead, so as not to lead the wires into the room. If the lightning protection measures are proper, the losses caused by lightning will be greatly reduced.