Method for making lightning protection grounding grid under geological conditions such as saline-alkali weathered stone in high mountain area

This article adopts the method of making wells and grounding; (mainly for the rock layer) the high mountains of the lightning arrester manufacturers are generally rocky, and it is not impossible to make a grounding grid on the rock. Drill holes φ200*2000-3000mm under the surface soil layer (depending on the environment), use blasting at the bottom to smash the stratum rocks to form gaps, pouring fillers into the non-metal grounding body (sintered type) vertically, and then After adding the polymer resistance reducer, add water appropriately. After adding water for 3-4 hours, add the anhydrous polymer resistance reducer and appropriate amount of filler, then ram it at a distance of 800mm from the surface soil layer. At this point, the vertical grounding body is laid. Begin to lay the horizontal grounding grid; the horizontal grounding grid adopts a copper cable of more than 35 square meters, after pulling the skin, properly paint conductive glue and make a horizontal grounding wire trough at a distance of 500 mm from the ground. The wire trough is 200 mm wide, and no water is placed on the wire trough. State polymer resistance reducer and appropriate amount of filler will lay the cable with conductive glue in the shape of the grid and then bury it in the soil; the grounding distance of the grounding grid can be laid at a distance of 1.5*1.5/3.0*3.0m, each cross The type cross point is used as the connection point of a vertical grounding body, and finally the surface of the ground network is filled with fine soil.

The soil in the saline-alkali area contains high corrosive substances. Therefore, the cold shrinkable cable terminal does not use metal materials as the grounding body in this kind of environment. Non-metallic materials are very suitable for use here. Here is an introduction to the use of expanded graphite in salt. Planting method of alkali weathered fossil geology. The geological conditions of the weathered stone are mainly composed of completely weathered stone, and the other is composed of a mixture of weathered stone and huge granite. The resistivity of the soil is above 2000 ohms. Under such conditions, the production of ground nets is It is very difficult. The construction difficulty of workers has suddenly increased, and many colleagues are discouraged by it.

Here I will introduce to you the methods to improve the difficulty of construction. Before the construction, the excavation should be irrigated with sufficient water. Because the structure of the weathered stone is loose, the water can penetrate the inside of the weathered stone. It is best to let it soak for more than 12 hours. The strength of the weathered stone is only equivalent to the state where the sand is compacted, and it is easy to construct. At this time, dig a trench with a depth of 1.2 meters and a width of 0.2 meters. If you encounter huge granite, you can bypass it and install it. The expanded graphite grounding body is placed horizontally, and the filler is wrapped on the outside. The grounding bodies are connected by flat steel, and the nodes are treated with anti-corrosion treatment. Only a dozen pieces of expanded graphite grounding bodies can meet the technical requirements. Note that it is best to use fine black soil for the backfill. If unconditional, you can also use the excavated weathered stone, but you must be careful not to use large pieces of weathered stone when you just backfill it. Try to use fine weathered stone soil as much as possible, and it must be layered and compacted. . Another type of situation is that the surface of the soil is 10 cm thick black soil, and under the black soil is iron plate sand of the same size. This is a very headache for making ground nets. Remove the black soil on the surface and dig out the iron underneath. For plate sand, each grounding electrode digs a 1.5-meter deep pit. At this time, each pit is easy to collapse due to the looseness of the iron plate sand. It is best if there is a baffle to block the surrounding iron plate sand. The pit can be dug larger. At this time, a 1.5-2m long galvanized iron pipe with a diameter of 30 mm in diameter is drilled at the bottom of the pit perpendicular to the ground. It is easy to construct on the loose iron plate sand. Connect the expanded graphite grounding body vertically to the pipe, and make a horizontal flat iron connection at a distance of 0.5 meters from the ground. The cross points want to be connected to each other, and the nodes are treated with anti-corrosion treatment. The iron plate sand can be directly backfilled, and the connection resistance value can meet the requirements of use.

Yichang Hengyuan Technology Co., Ltd. is a professional manufacturer of European-style cable connectors, plug connectors, cable branch boxes, American elbows, high-voltage vacuum circuit breakers, high-voltage load switches, lightning arresters, zinc oxide arresters, tank arresters, overvoltage protectors, Counters, monitors, heat-shrinkable cable accessories, cold-shrinkable cable accessories, T-heads, wall bushings, European cable accessories, American cable joints, transformer neutral point protection devices, fuses, isolating switches, PT cable heads, elbows Manufacturers of type cable joints, 10kV outdoor terminals, switch cabinets, cable intermediate joints, cable accessories and other products