Work grounding is also called system grounding, is based on the normal operation of the power system needs to be a point of the network grounding. For example, the neutral point of the three-phase system grounding, its role in stabilizing the grid to the ground potential, which can make the insulation to the ground to reduce, but also to make the insulation flashover or breakdown of the ground is easy to find, as well as the implementation of relay protection measures.
2. Protective grounding
Protective grounding, also known as safety grounding, the metal casing of the electrical device, the frame of the distribution unit and the line towers, etc., due to damage to the insulation may be energized, in order to prevent it from endangering the safety of persons and equipment and the establishment of the grounding.
3. Lightning grounding
This is in order to allow a strong lightning current into the ground safely, in order to reduce the potential rise caused by lightning current flow through, such as lightning rods, lightning lines and lightning arrester grounding.
4. anti-static grounding
In order to prevent static electricity on flammable, explosive substances such as fuel, natural gas storage tanks and pipelines and the dangerous role of grounding.