In engineering, we all need to carry out grounding. What is the purpose of grounding and what are the classifications of grounding? Below, the editor of graphite grounding will introduce them one by one.

What is grounding

Connecting a part of the power system or electrical device to the grounding electrode through a grounding wire is called grounding. The grounding part in the power system is usually the neutral point, or it can be a point on the phase line. The grounding part of an electrical device is a normally uncharged metal conductor, typically a metal casing. Sometimes, for the purpose of safety protection, connecting conductors that do not belong to electrical devices, such as water pipes, air ducts, oil pipes, and metal components of buildings, to grounding electrodes is called grounding; The metal columns of the curtain wall glass are connected to the grounding electrode, also known as grounding.

The role of grounding

The main function of grounding is to prevent electric shock to personnel, ensure the normal operation of the power system, protect lines and equipment from damage, prevent electrical fires, prevent lightning strikes, and prevent static electricity damage.

Classification of grounding

Grounding is generally divided into two categories: protective grounding and functional grounding.

(1) Protective grounding is divided into the following four types:

Protective grounding: Grounding the external leakage conductor of the equipment, which is called protective grounding. The purpose is to prevent electrical equipment from being damaged in insulation or causing leakage, which can cause the normally uncharged external leakage conductor to become electrified and result in electric shock when touched by people.

Lightning protection grounding: Guiding lightning into the ground to prevent lightning currents from causing electric shock to people or damage to property.

Anti static grounding: Introducing static charges into the ground to prevent harm to human body and equipment caused by static electricity accumulation.

Anti corrosion grounding: Metal bodies are buried underground as sacrificial anodes or sacrificial cathodes to protect the connected metal bodies, such as metal oil pipelines.

(2) Functional grounding can also be divided into four types:

Working grounding: In order to ensure the normal operation of the power system, grounding is carried out at an appropriate location in the power system, which is called working grounding. In communication systems, this point is generally a neutral point.

Logical grounding: In order to obtain a stable reference point position, appropriate metal components in electronic devices are used as reference zero potential. Electronic devices that need to obtain zero potential are connected to this metal component, and this grounding is called logical grounding.

Shielding grounding: Grounding a metal shell or metal mesh to protect electronic devices inside the shell or mesh from external electrical interference, or to prevent electronic devices inside the shell or mesh from interfering with external electronic devices.

Signal grounding: The grounding set to ensure that the signal has a stable reference potential is called signal grounding.

The editor of graphite grounding concludes that grounding work cannot be ignored. Doing a good job in grounding work is very convenient for our lives and also provides a certain guarantee for safety issues.