WHY NEED TO INSTALL surge protection devices?
I. The Dangers of an Overvoltage Pulse
An unwanted overvoltage spike, especially a propagating lightning impulse, on the power line can have serious consequences for any business or vehicle or device. To fully visualize the overvoltage surge losses caused by the absence of a surge protection device, it is necessary to include equipment replacement/repair costs, data recovery costs, and downtime losses. due to failures and lost opportunity costs. In addition, human life can also be put in danger if the safety systems fail to function due to overvoltage pulses.
According to the Insurance Information Institute, NY, (NY Press Release, August 11, 1989): Lightning surges and other overvoltage surges can cause damage to property, electrical-electronic, and telecommunications equipment. is estimated at more than $1.2 billion per year in the United States alone. This amount represents approximately 5% of insurance costs across the United States.
According to Holle et al., Journal of Applied Met, Vol 35, No.8, August 1996: The premium for damage due to surge surges and other overvoltage surges is $332 million annually in the United States, but many organizations still don't cover this type of property damage. On average, only 1 in 57 lightning strikes are insured in the United States.
In Vietnam, according to 2001 statistics, there were 400 incidents in the electricity industry, 50% of which were caused by lightning (Tien Phong Newspaper, 08/08/02). As for the Post and Telecommunications industries, there are 53 incidents caused by lightning (27.13% of telecommunications incidents), causing a loss of 4.119 billion VND, and the total time of loss of communication due to lightning is 716 hours (lightning protection for telecommunications networks. Vietnam Communications – Inadequacies Le Quoc Tuan Telecommunications Department, Pham Hong Mai – TTTTBD)
Loss from overvoltage surge damage for systems not fitted with overvoltage surge arresters (especially surge arresters) includes the following:
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II. Why is it necessary to install surge protection devices?
Xung sét lan truyền là một trong những nguồn gây quá điện áp được biết đến nhiều nhất. Các nguồn khác gồm có chuyển mạch nguồn và thiết bị vận hành của các nhà máy lân cận, vận hành của các thiết bị điều chỉnh hệ số công suất, chuyển mạch và xử lý sự cố trên đường dây truyền tải và các trạm biến áp. Một lưu ý quan trọng là tia sét không cần phải đánh trực tiếp lên đường dây nguồn mới gây hư hỏng; một tia sét đánh cách xa vài trăm feet cũng có thể gây xung cảm ứng lan truyền lớn có khả năng phá huỷ, thậm chí đến đường cáp ngầm. Do đó thiết bị chống sét lan truyền cũng không kém phần quan trọng so với direct lightning protection.
Thiết bị chống sét lan truyền
Other overvoltage pulses are generated inside the devices themselves, due to switching on and off electrical loads such as lights, heating systems, motors, and the operation of laser printers, photocopiers, etc.
Modern industry relies heavily on automated electrical equipment for increased productivity and safety. The economic benefits of these devices have been widely recognized. Microcomputers are very common, and microprocessor-based programmable controllers (PLCs) are used in most manufacturing equipment. Microprocessors can also be found built-in in many industrial machines, security and fire alarms, timekeeping equipment, inventory tools, etc.
Judging by the wide range of sources of overvoltage surges (due to lightning propagating, generated in equipment) and the potential for large losses caused by power interruptions, the initial installation costs of protective devices Overvoltage impulses, especially surge protection devices, are reasonable for any vehicle or device. The cost of surge arresters is usually approximately 10% of the economic risk cost of the equipment to be protected.
For effective protection, ERICO's six-point comprehensive lightning protection solution should be followed. Points 5 and 6 in this solution meet the needs of surge protection for power lines and surge protection for signal lines. At point 5, the first layer of protection is the primary surge arrester at the input, followed by the secondary surge protection device at the distribution switchboard or at other necessary points.
A 6-point lightning protection solution
Nguồn: WWW.ERICO.COM