Chisels are classified in different shapes according to different uses:
Flat chisel: the cutting edge is flat, the cutting edge and the chisel body is an inverted isosceles triangle, mainly used for opening square holes or repairing some square holes;
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First, the split arrester uses a disconnection method to quickly disconnect the power supply during lightning strikes to protect the equipment. Advantages: simple engineering. Disadvantages: Lightning strike time is very short (calculated in nanoseconds), sometimes it is too late to completely disconnect, lightning pulse current has caused heavy losses to electrical equipment, and at the same time, people's lives and work also do not allow electrical equipment to be powered off; Obviously, it is not able to prevent lightning, and the effect can be imagined.
Second, the grounding arrester is the use of ground discharge method, the principle: the lightning current directly into the earth, to avoid electrical lightning, but the need for a sound buried line engineering. Advantages: There is almost no technical component. Disadvantages: It will cause great construction inconvenience to the installation of high-rise buildings, households with unsatisfactory discharge of high mountains and loess, etc. Under this kind of environment, the effect of releasing lightning is also unsatisfactory. Will be eroded. No one will always check whether the ground wire is corroded. Sometimes the environment is not allowed. To achieve the national standard (resistance ≤ 4 ohms), the fully qualified cost is almost several times, or even several times, the cost of the arrester itself. If there is a drawback that can solve the above problems at the same time, it is ideal.
Oblique chisel: the blade is 45° Angle, the blade and chisel body is an inverted right triangle, mainly used for repair, most of the dead corners for carving and carving repair;
Gouge: the cutting edge is semicircular, mainly used for opening circular or elliptical holes;
U type chisel: the cutting edge is U-shaped, which is rare now, mainly used for carving and repair;
At present, although there are many kinds of lightning protection technology in our country, the principle is nothing more than two methods of lightning protection.