The introduction of grounding technology was originally designed to prevent lightning strikes on equipment such as electricity or electronics. The purpose is to introduce the lightning strike current generated by lightning into the earth through a lightning rod to protect the building.
At the same time, grounding is also an effective means to protect personal safety. When the phase line caused by some reason (such as poor wire insulation, aging of the line, etc.) and the equipment casing touch, the casing of the equipment will have dangerous voltage. The generated fault current flows through the PE line to the ground for protection. With the development of electronic communication and other digital fields, it is far from satisfactory to consider only lightning protection and safety in the grounding system.
For example, in a communication system, the interconnection of signals between a large number of devices requires each device to have a reference 'ground' as the reference ground for the signal. Moreover, with the complication of electronic devices, the signal frequency is getting higher and higher. Therefore, in the grounding design, electromagnetic compatibility problems such as mutual interference between signals must be given special attention. Otherwise, improper grounding will seriously affect the reliability of the system operation. Sex and stability. Recently, the concept of "ground" has also been introduced in the signal reflow technique of high-speed signals.