What are some typical power quality events experienced by manufacturing operations?
Manufacturers are confronted by a broad range of potential power quality disturbances, many of them specific to the production process, product line and industry represented. Notwithstanding the individuality of each manufacturing operation, a number of potential power quality problems are possible. Among them are the following examples of typical problems and solutions. • Severe Voltage Sag A manufacturing process shutdown at a large industrial manufacturing plant was caused by the failure of a company-owned 2,000 kVA transformer in another part of the plant. The failure shorted the line for five cycles before the fault recloser restored normal voltage. Although the incident was isolated, it affected the entire facility. The solution centers on supplying power to the controller through a UPS or a motor/generator with sufficient flywheel inertia to rid through the sag. • Failure of Variable Speed Drives Intermittent shutdowns of 5hp variable-speed drives at a manufacturing plant result
