Supply voltage temporarily falls is one of the causes of the problems encountered by the industrial power quality needs and cause losses as inevitable. That is what is causing huge damage. Especially with the industry with a load that is sensitive, such as load voltage inverter or inverter is for pay are granted to industrial motors. The computer in the Office is important: around the factory cars, semiconductor equipment, industrial relay. Office buildings and hospitals or medical centers that survey in the United States found that pressure falls while 92% of the electric power quality problems, which is worth about losses of four trillion dollars per year, and although no impact study due to Western pressure on countries of Thailand, but it is estimated that there are several million baht per year.
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