The main uses of the grounding resistor include personal safety, static electricity, and lightning protection. ‌ ‌
‌ Personal safety ‌ : The grounding resistance plays a key role in the electrical system. When the metal shell, concrete or pole of the electrical equipment is charged due to insulation damage, the grounding resistance can introduce current to the ground to prevent electric shock accidents and protect human safety.
‌ Prevent electrostatic hazards ‌ : In easy fuel oil, natural gas storage tanks and pipelines, electronic equipment and other places, the accumulation of static electricity may cause danger. Grounding resistance Connects the device to the ground to eliminate the accumulation of static electricity and prevent explosions or device damage caused by static electricity.
‌ lightning protection ‌ : During the thunderstorm season, lightning and lightning can cause serious damage to buildings and electrical equipment. Ground resistance protects buildings and equipment from lightning overvoltage by introducing lightning into the ground, ensuring personal and property safety.
Method of measuring ground resistance
There are many ways to measure ground resistance, including two wire method, three wire method, four wire method, single clamp method and double clamp method. These methods are suitable for different environments and conditions, ensuring the accuracy and reliability of the measurement.
Specification requirements for grounding resistance
Grounding resistance requirements vary according to application scenarios. For example, the independent lightning protection grounding resistance should be less than or equal to 10 ohms, the independent safety protection grounding resistance should be less than or equal to 4 ohms, and the independent AC work grounding resistance should also be less than or equal to 4 ohMs. These specifications ensure the effectiveness and safety of the grounding system.