Large amusement equipment, lightning protection and grounding

Of the problem, in recent years, China's newly built many large play equipment amusement parks, park, concentrated install a different type of play equipment, many of which are tall, type Electric Equipment. Also in some park or city square, also equipped with several high or several large electric amusement equipment, such as roller coasters, space shuttle, falling tower, Ferris wheel, etc., some of them highly, at 30m or 60m, and some more high. These tall large play equipment, although different shapes, the game features different, but have the following characteristics:
① device body mostly metal structure;
② electric drive, or electric - pneumatic drive, electric - hydraulic drive;
③ modern large play equipment controlled by computer. The device is mounted at different heights on the number of electronic sensors, such as pressure, velocity, position sensors, in order to ensure the safety of operation;
④ crowded participate in the game, during the game, the human body mostly with the various forms of metal objects;
⑤ large play equipment, space and equipment itself, with CCTV surveillance, broadcasting, communications and other information systems on-site management. Because of these characteristics, in order to ensure the safety of equipment and personnel, lightning protection and grounding measures have to be thoughtful and reliable. However, for this problem seriously enough in the past. Although the occurrence of lightning assault case has not been reported yet, but the occurrence of lightning damage to electrical components that there is an appearance.
Through a large amusement park amusement equipment engineering and research has built a large amusement park and playground equipment high monomer lightning protection and grounding conditions with reference to our existing norms, especially foreign professional firms, lightning protection and grounding equipment for the electric amusement basic rules and requirements, should pay attention to this issue.
Specifications and requirements of the electric amusement equipment lightning protection, our existing norms "amusement machines and children's play equipment safety" (GB8408-2000), the main provisions of the following points:
a. Lightning directly stroke: Ferris wheel, sliding class recreation facilities and other tall, taller than 15m, shall be equipped with lightning, lightning protection grounding resistance less than 10n.
b. Lightning invasion wave: the use of low-voltage cable power, low-voltage cable into the household at the end of the cable metal sheath, metal trough should be grounded and grounding and lightning protection device is connected. When using low voltage overhead power lines, the overhead line arresters should be installed into the client. And should be grounded. Grounding resistance less than 10n.
c. Ground: Electric Equipment Grounding should be used in low voltage distribution TN-s system; electrical equipment, electric amusement equipment normally uncharged metal shell and metal structure must be grounded. Protection of low voltage distribution system grounding and repeated grounding grounding resistance less than 10n.
d. Game machines and children's play equipment, should not be set in the high-voltage distribution overhead lines within the channel.