When the grounding is good, a low-resistance channel is formed, and a lightning current is discharged, both the conventional arrester and the “equipotential†arrester will satisfy the need for discharge first, and a channel for the lightning current to leak into the ground first is advocated. In this way, overvoltage and overcurrent will not flow into the device as much as possible. Make the device protected.
However, when the equipment system is not equipped with a grounding condition, that is, when there is no ground discharge, the conventional arrester will not work after the grounding path is obstructed, and only the lightning current flowing in the equipment will be damaged and the equipment will be damaged.
The design of the "equipotential" arrester has a distinctive mindset. Firstly, a mechanism for limiting the pressure and current limiting is set up on each path leading to the equipment, and the system is clamped on the arrester's various paths to form a horizontal and vertical all-round “isopotential†state, and excessive lightning current inflow is blocked. equipment. At the same time, it can provide a low-resistance channel to the grounding grid, so that when the grounding is good, it is given priority to discharge through the grid to reduce the impact of lightning current on the equipment and on the relevant lines. If there is no ground discharge or the ground net is changed to a straight high-impedance state and cannot be discharged, we will make other relatively low-resistance or low-voltage lines or metal bodies connected to the lightning arrester bypass circuit and the arrester. The location, that is to force the lightning current to pass through the path allowed by the arrester to the low impedance, low voltage port circuit, or part of the metal object with “equipotential†connection to form a lightning current path, allowing the lightning current to flow outside the device. In places or locations, they may leak part of a grounded network that is well grounded when they are routed elsewhere, or they may be consumed as heat when other metal bodies and resistors pass through.
The anchor drilling rig is mainly used in hydro power stations, railways and highways, in order to prevent and control various geological disasters, anchoring operations are carried out on landslides and dangerous rock masses.It is mainly used in landslide and dangerous rock anchoring projects in tunnels, railways, highway slopes and other kinds of geology, especially for high slope rock anchoring projects. Drilling operations consume less manpower and material resources, have high construction efficiency and high safety factor. It is also suitable for the construction of deep foundation pit support, reinforcement hole for anti-float anchor and foundation grouting, blast-hole in blasting project, high pressure sprinkling stake and tunnel pipe support hole, etc..
The drilling technology with casing of anchor drilling rig is designed to solve the problem that complex rock layers cannot be holed. The drill bit impacts rock continuously, and the broken rock is blown to the ground by the air pressure discharged from the gap between the casing and the drill pipe. The drill pipe and bit can be lifted after punching the hole, and the casing is placed in the middle of the rock layer, so that the rock layer doesn't collapse.
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