What are the common errors in grounding technology?

The link between the classification of grounding

In a building, the best way to ground is to create three separate grounding systems. The first category is lightning protection grounding. It is a protection ring around the building connected to a grounding rod. This protection ring is also used as a terminal of the lightning arrester feeder. The second type is the grounding of the power supply system. The system is entering the building. The entrance should be grounded safely and reliably, and most relevant regulations require that the grounding resistance should not be greater than 3 ohms.

A third type of grounding system should be established in buildings that use sensitive electronic equipment, communications equipment, computer systems, and control systems—signal loops or instrument grounds. This separate instrument grounding facility should be individually connected to a dedicated instrument grounding network with a ground impedance of no more than 3 ohms as the reference electrical plane for the electronics signal loop. Separating the ground of the power supply system from the ground of the instrument or electronic equipment is often difficult. The separation depends on the structure of the equipment, the isolation of the instrument or electronic equipment from its housing and other conductors connected to the safety fuse circuit. Sometimes the separation of the signal loop ground and the power supply system ground can be achieved by using a radio frequency choke coil in the safety ground loop. It is also possible to use a delta-Y power conversion device and a safety zone to rebuild a safety grounding facility. It is important to prioritize safety standards in the equipment area, and any design should strictly comply with safety technical requirements and standards.

In the past people had misunderstandings about grounding

In past projects, people have misunderstandings and deficiencies in grounding technology. It is often simply considered that the function of grounding is nothing other than lightning protection and ensuring the safe operation of the power system, providing circuits and the like. Think of the earth as a big filter and everything will be fine when the equipment is grounded. Every engineering and technical personnel involved in power, electronics, and electronics are dealing with grounding all day. If you ask a technician: Do you understand grounding technology? He may think that grounding technology is pediatrics. Ask yourself a question. If you ask again: What is the characteristic frequency? What is the critical length of the grounding electrode? I am afraid that most engineering and technical personnel cannot answer it.

Electromagnetic interference is often related to grounding technology

In recent years, from the construction and operation of leading organizations at all levels and domestic large-scale enterprises, the author has learned that this humble “pediatrics” has become a difficult subject. Grounding technology has become abstract. Through repeated research and digestion of various grounding technologies obtained over the past few years, it was found that filters that suppress common-mode and differential-mode conduction interference in power supply lines and shielding measures against radiation interference are closely linked to grounding technologies.

Some large state-owned enterprises have introduced a whole set of production lines, and the products they produce have become the country's top-quality products, creating enormous wealth for the country. It is these international-level production lines that also have electromagnetic interference from time to time, affecting production safety. In the past few years, foreign manufacturers have come to dozens of times to hundreds of electromagnetic compatibility experts to carry out a network-style inspection of the equipment. Some experts have turned all equipment wiring up and down several times.

Some hospitals use electric knives to accidentally burn patients. In fact, the manufacturing of these equipment is very sophisticated and the safety measures are very strict. How could these accidents occur?

How to solve electromagnetic interference problems

More importantly, the occurrence of such anomalies often leads to no reason, or nowhere to find the root of the problem. It is just a headache and a cure. What equipment was damaged and what equipment was replaced. Who knows when the next interference will come out ... ..., can not say that these problems are caused by grounding technology. Because electromagnetic compatibility is more complex, it can be said that grounding technology plays an important role in electromagnetic compatibility.

Is the problem of electromagnetic interference a problem? Not! The author is foolish to see that everything has its own internal laws of science. The reason that the problem of interference is not essential for a long period of time is a description of our lack of knowledge in this subject area. As long as we have a firm grasp of professional knowledge, especially wave theory, to understand the transmission laws and characteristics of electromagnetic interference in these buildings, the problem can be easily solved.

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