Lightning protection of the substation   For the line lightning protection, only partial lightning protection is required, that is, according to the importance of the line, only a certain level of lightning resistance is required. And for the power plant, substation required complete lightning resistance.   Lightning accidents in power plants and substations come from two aspects: lightning strikes directly at power plants and substations; Lightning strikes on transmission lines generate lightning waves that invade power plants and substations along the way.   To protect the substation from direct lightning strikes, you need to install lightning rods, lightning rods, and well-laid grounding nets.   The installation of lightning rods (wires) should make all equipment and buildings in the substation within the protection range; There should also be enough space between the protective object and the lightning rod (wire) in the air and the underground grounding device to prevent counterattack (reverse flashover). The installation of lightning rod can be divided into independent lightning rod and framed lightning rod. The power frequency grounding resistance of the vertical lightning rod should not be greater than 10 ohms. The insulation of power distribution units up to and including 35kV is weak. Therefore, it is not appropriate to install a framed lightning rod, but an independent lightning rod. The electrical distance between the underground connection point of the lightning rod and the main grounding network and the ground point of the main transformer must be greater than 15m. In order to ensure the safety of the main transformer, lightning arrester is not allowed to be installed on the transformer door frame.

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Post time: Dec-05-2022