When selecting equipment, full consideration should be given to various normal and abnormal working conditions at the installation site of the lightning arrester, and the selection should be carried out according to the general procedure for lightning arrester selection (see Chapter 5 of the Technical Standards for Lightning Arresters). To prevent accidents such as lightning arrester explosion or internal resistor breakdown, lightning arrester fracture, and lightning arrester pollution caused by improper equipment selection and parameter mismatch with actual operating conditions. New projects should use metal oxide surge arresters, while in operation silicon carbide valve surge arresters should be gradually phased out.
2.When ordering equipment, the manufacturer should be required to provide test reports and certificates of conformity for the sealing materials, insulation jackets, pressure release plates, etc. used in the production of the purchased lightning arrester. When supervising the production of purchased lightning arresters, the manufacturer should be required to conduct random inspections and tests on the sealing materials; Special attention should be paid to the testing of sealing performance during routine or acceptance tests. SF6 surge arresters with a nominal voltage of 110kV or above should be equipped with gas pressure gauges, and sealing performance tests should be conducted during handover. A lightning arrester that has been in operation for 15 years should undergo special inspections, with a focus on tracking changes in leakage current during operation. After shutdown, the pressure release plate should be inspected for any damage. To prevent explosion, internal resistance breakdown or flashover caused by moisture during the operation of lightning arrester equipment.
3.During the supervision of the purchased lightning arrester, special attention should be paid to the partial discharge test during routine or acceptance tests. When necessary, partial discharge tests should be conducted on metal oxide lightning arresters upon arrival and before installation. To prevent debris from entering the lightning arrester equipment and causing explosions. At the same time, it can also prevent the aging of the resistor caused by internal discharge.
4.After the installation or maintenance of lightning arrester equipment is completed, and when the equipment is shut down, the connections of each part should be carefully inspected; When using screw connections, spring washers must be used; Copper aluminum transition is strictly prohibited for the wiring board of lightning arresters with a nominal voltage of 110kV and above. To prevent the occurrence of lead wire, voltage equalizing ring detachment faults, and lightning arrester collapse accidents.