2. Use galvanized steel pipe to make the tip, the thickness of the wall should not be less than 3mm, and the tin length of the tip should not be less than 70mm.
3. The lightning protection tower should be installed vertically and firmly. Permissible deviation of verticality is 3/1000.
4. Welding requirements Welding should be lap welding, the lap length must meet the following requirements:
5. Flat steel is 2 times its width (and at least 3 edge welds).
6. Round steel is 6 times its diameter. 7. When the round steel is connected with the flat steel, its length is 6 times the diameter of the round steel.
8. The lightning protection tower is generally made of round steel or steel pipe, and its diameter should not be less than the following values: a. The independent lightning protection tower generally adopts a galvanized round steel with a diameter of 19mm. b The roofing tower uses 25mm diameter galvanized steel pipe. c The top tower of the water tower is made of galvanized steel pipe with a diameter of 25mm or 40mm. D The top of the chimney is a lightening tower with a diameter of 25mm. Galvanized round steel or a galvanized steel pipe with a diameter of 40mm. e Lightning protection ring with a diameter of 12mm Galvanized round steel or a section of 100mm2. Flat steel, its thickness should be 4mm.
9. The arrester tower should be made of round steel or welded steel pipe, and its diameter should not be less than the following values: The needle length is less than 1m: round steel 12mm, steel pipe 20mm, needle length 1-2m: round steel 16mm, steel pipe 25mm On the top of the chimney, the round steel is 20mm and the steel tube is 40mm.
The importance of grounding in substation lightning protection
The rationality of the substation grounding system is an important issue that directly affects the safety of people and equipment. As the scale of power systems continues to expand, the design of grounding systems becomes more and more complex. Substation grounding includes working ground, protective grounding, and lightning protection grounding. The working ground is the grounding provided for the operation needs in the electrical system of the power system; the protective grounding is the metal casing of the electrical device, the structure of the power distribution device, and the wiring pole tower, etc. The insulation damage may cause electrification, so as to prevent it from endangering the human body. Grounding is provided for the safety of the equipment and the grounding of the lightning protection is grounding for the discharge of the lightning current from the lightning protection device to the earth. In addition to the requirement for grounding impedance, substation grounding network safety also imposes higher requirements on the structure, service life, step potential difference, contact potential difference, and transfer potential hazard of the ground network.
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