Why Is Ground Wire so Important in Power Protection Systems?

Ground Wire, also known as lightning arrester, has the core function of safely introducing current into the earth. When electrical equipment leaks electricity, the ground wire can ensure that the current passes smoothly through it into the earth, thereby ensuring the safety of people and equipment. The symbol of the ground wire is E (Earth), and it has many types, such as power ground wire and circuit ground wire. In my country's current standard GB2681, the color of the wire is clearly specified: phase A in the phase line is yellow, phase B is green, and phase C is red; the neutral line is light blue; and the ground wire, especially the ground wire in the three-hole socket, is usually yellow and green, and in the socket, the left is zero and the right is live, and the middle (or top) is the ground wire.

In short, Ground Wire is an important means of electrical protection. Its core function is that when electrical equipment leaks electricity or is induced to be charged, it can quickly introduce current into the earth, thereby ensuring that the equipment casing is no longer charged and ensuring the safety of personnel and equipment.

Ground Wire, an indispensable safeguard in the power system, has the core function of preventing human body from harm caused by leakage accidents. By directing the current on the metal shell that may be charged to the ground, the ground wire effectively avoids the risk of electric shock to the human body. If it is not grounded, once the electrical equipment leaks, the human body may come into contact with the charged body, which may cause an electric shock accident. Therefore, using an electrical ground wire is an important means to ensure personal safety. It can prevent the risk of electric shock caused by electrical leakage. However, it should be noted that the ground wire cannot be used for lightning protection.

Specifically, due to poor insulation performance or humid use environment, the shell of household appliances may carry static electricity, and in severe cases, electric shock accidents may even occur. In order to avoid such accidents, we can connect a wire to the metal shell of the appliance and connect the other end to the ground. In this way, once the appliance leaks, the Ground Wire can lead the static electricity into the ground for release. In addition, for electrical maintenance personnel, when using a soldering iron to solder the circuit, it is also necessary to pay attention to the fact that the soldering iron may be charged and break through the integrated circuit in the appliance. At this time, the ground wire is particularly important. Similarly, grounding the computer mainframe is also one of the necessary measures, which can effectively prevent the occurrence of computer crashes.

In the power system, Ground Wire is an indispensable safeguard. It can provide important safety protection for workers when voltage unexpectedly appears on the equipment and lines that have been powered off. In addition, the ground wire also has its unique role in electrical appliances. It can timely guide the unsafe charge or leakage current generated by various reasons to ensure the safe operation of electrical equipment. In layman's terms, the ground wire is an important tool to prevent static electricity or leakage on the surface of electrical equipment from causing harm to people, especially when using high-power electrical appliances.

In practical applications, there are two main grounding methods for Ground Wire: system grounding and protective grounding. System grounding aims to establish a zero potential reference point, while protective grounding focuses on ensuring personal safety. The specific functions of protective grounding include: providing a low-impedance connection between the equipment and the grounding body, thereby reducing the risk of electric shock; at the same time, it can also provide a low-impedance return path for the ground fault current, so that the fuse or circuit breaker can be operated in time, further ensuring the safety of people and equipment.