What is grounding? What is zero connection? Why grounding and zero connection?

In the power system, making a good electrical connection between the neutral point, shell or bracket of equipment and electrical devices and the grounding device using conductors is called grounding.

Connecting the metal casing of electrical equipment and electrical devices to the system zero line is called zero connection.

The purpose of grounding and zero connection is to ensure the normal operation of electrical equipment, such as working grounding; The second is for personal and equipment safety, such as protective grounding and neutral connection. Although in terms of the nature of grounding, there are also repetitive grounding, lightning protection grounding, and electrostatic shielding grounding, their functions are not limited to the above two.