The editor of this article introduces an overview of protective grounding for graphite based flexible grounding bodies. What is protective grounding? The so-called protective grounding is the practice of tightly connecting the metal shell of electrical equipment, the structure of distribution equipment, and the line tower to the grounding body deeply buried underground through a protective grounding wire to prevent the electrical equipment from being charged and endangering personal and equipment safety. Below, the editor of graphite based flexible grounding body will lead you to understand it together.

Grounding protection is generally used in power supply systems where the neutral point of distribution transformers is not directly grounded (three-phase three wire system), to ensure that the ground voltage generated when electrical equipment leaks due to insulation damage does not exceed the safe range. The so-called graphite based flexible grounding body reminds you that protective grounding is a protective wiring method that reliably connects the metal parts of electrical appliances (i.e. the metal structural parts insulated from the live parts) that are not charged under normal circumstances but may be charged in the event of insulation material damage or other situations to the grounding body with wires. This is what the editor of China Security Network introduces to you about protective grounding.

Measures to ground the metal casing of electrical equipment. It can prevent strong current from passing through the human body when the metal shell is electrified due to insulation damage or unexpected situations, ensuring personal safety.

Example of application principle:

If household appliances do not use grounding protection, when a part of the insulation is damaged or a phase line touches the casing, the casing of the household appliance will be charged. If the human body touches the insulation damaged casing (structure) of the electrical equipment, there is a risk of electric shock. On the contrary, if electrical equipment is grounded for protection, a single-phase grounding short circuit or leakage fault will generate a large short-circuit current or leakage current in the line, causing the higher-level protection device (circuit breaker or leakage circuit breaker) to trip and automatically cut off the power supply of the faulty line for timely inspection and maintenance. This avoids the threat posed to personnel (or equipment) by the leakage state operation of electrical equipment.

The above is an overview of what protective grounding is introduced by the editor of graphite based flexible grounding body. We hope that if you encounter similar problems in future applications, you will know their theoretical knowledge.