Simply put: the grounding wire is a way of electrical protection. Its function is to quickly introduce current into the earth through the grounding wire when your electrical equipment is leaking or inductively charged, so that the equipment shell is no longer charged, thereby ensuring the safety of the equipment behind the personnel.
For example, due to poor insulation performance of household appliances or humid environment, the shell of household appliances will be charged with static electricity, and electric shock accidents may occur in serious cases. In order to avoid accidents, a wire can be connected to the metal shell of the electrical appliance, and the other end of the wire can be connected to the ground. Once the electrical leakage occurs, the grounding wire will bring static electricity into the ground and release it. In addition, it is more important for electrical maintenance personnel to use electric soldering irons to solder circuits, sometimes because the electric soldering irons are charged and break down and damage the integrated circuits in the electrical appliances. Friends who use computers sometimes ignore the grounding of the mainframe. In fact, connecting a ground wire to the mainframe of the computer can prevent the occurrence of crashes to a certain extent.
The grounding wire in the power system is an important tool to ensure the staff when there is unexpected voltage on the equipment and lines that have been powered off. According to regulations, the grounding wire must be made of bare copper flexible wire above 25mm2.
In electrical appliances: the grounding wire is a line that is connected to the housing of electrical equipment and other places to timely lead out unsafe electric charges or leakage currents generated due to various reasons.
In layman's terms: Grounding can prevent the static electricity or leakage on the surface of electrical equipment from causing electric shocks to people. High-power electrical appliances need special attention.
There are two types of grounding for grounding: system grounding and protective grounding. The task of system grounding is to establish a zero potential reference point; the task of protective grounding is to protect personal safety. For protective grounding, its tasks are:
A) Provide a low-impedance connection between the equipment and the grounding body, thereby reducing the risk of personal electric shock;
B) Provide a low-impedance path for the ground fault current to return to the power source, so that the fuse or circuit breaker can operate.
C) Provide a low-impedance discharge path to the ground for the lightning induced current
WeChat
15388193573
