The design of the grounding system of the customized power distribution cabinet is crucial and directly related to the safety of equipment operation and personnel life. The following are the design points to ensure its safety and reliability.
First, clarify the purpose of grounding. Grounding is mainly to prevent the risk of electric shock when electrical equipment leaks electricity, and also to ensure the stable operation of the electrical system and prevent interference such as lightning and static electricity.
When designing the grounding system, it is necessary to determine the appropriate grounding method. Common ones are working grounding, protective grounding and lightning protection grounding. Working grounding is to ensure that the potential reference point of the electrical equipment is stable under normal working conditions; protective grounding is to connect the metal shell of the equipment to the earth, and once the equipment leaks electricity, the current can quickly flow into the earth; lightning protection grounding is to introduce lightning into the earth and protect the equipment from lightning damage.
The selection of grounding resistance should be determined according to relevant standards and actual needs. The smaller the grounding resistance, the faster the leakage current or lightning current can be introduced into the earth. Generally, the grounding resistance value should meet the requirements of national and industry standards. The grounding resistance can be reduced by increasing the number of grounding electrodes and using low-resistance grounding materials.
The design of the grounding electrode is also critical. The grounding electrode can be in the form of metal rods, metal plates, etc., buried at a certain depth underground. The length, diameter and number of the grounding electrode should be reasonably selected according to the capacity of the distribution cabinet, the use environment and other factors. At the same time, to ensure that the grounding electrode has good contact with the soil, you can use resistance reducing agents to improve the grounding effect.
Inside the distribution cabinet, all metal parts that need to be grounded, such as the cabinet body, cabinet door, metal casing of electrical components, etc., should be connected to the grounding busbar through a dedicated grounding wire. The grounding busbar should be reliably connected to the external grounding system.
In addition, the grounding system should be inspected and maintained regularly. Check whether the grounding resistance meets the requirements and whether the grounding wire is loose or corroded. If there is a problem, it should be repaired and replaced in time.
In short, the grounding system design of the customized power distribution cabinet needs to take into account a variety of factors, strictly follow the standard specifications for design and construction, and conduct regular inspection and maintenance to ensure its safety and reliability. Only in this way can we effectively prevent the occurrence of safety accidents such as electric shock and lightning strikes during the operation of electrical equipment, and provide strong guarantees for the stable operation of equipment and the safety of personnel.