Power quality issues generated from incoming grid are one of the prevalent problems of power quality. Any disturbance on the grid in the form of huge load variation will affect entire grid. Voltage dips, sags, swells, under voltage and interruptions are still quite common in Indian grid.
Digital electronics, computers and other microprocessor based equipment are more sensitive to power line disturbances than other electrical equipment depending on the quality of their power supply and how they are interconnected.
The circuits in electronic equipment operate on direct current (DC) power. The source is an internal DC power supply which converts, or rectifies, the AC power supplied by the utility to the various DC voltage levels required. Variations in the AC power supply can therefore cause power quality anomalies in computers and power electronic components.
If there are heavy loads connected on the same grid as of a sensitive process driven manufacturing facility, any variation in the heavy load at the grid will cause voltage disturbances at the manufacturing facility.
In modern and state of the art automatic food processing industries, any disturbance in supply voltage parameter in the form of voltage dip, sag, swell or interruption can result in stoppage of the manufacturing process.
The Case study below presents problems faced by a beverage facility due to above mentioned reasons. The power quality issues were generated due to traction load connected on the same grid as of the industry. The case study also analyses monetary loss due to each event of voltage disturbance and mitigation measure adopted by the industry.