Abstract--This paper presents the results of a case study and survey of 10 industrial customers that investigates the effect of power quality to the industries. The survey also observed factory operation, products, equipment and processes used in production. The paper also described the significant of power quality monitoring system and mitigation strategies by industries. The quality of power supply has caused a direct economic impact to many industrial customers. The effects of power quality can be shown up in many aspects of industrial operations. Index Terms—Economy impact, Industrial zone, Interruption cost, Monitoring, Power quality, Voltage sag, I. INTRODUCTION Power quality has become a very important issue recently due to the impact it creates with an increasing number of power quality concerns for electricity suppliers, equipment manufactures and customers [2]. Nowadays, there are so many industries using high technology for the manufacturing and process unit. These require high quality and high reliability power supply. The industries like semiconductor, computer and business equipment manufacturing unit are very sensitive to the modest change in the power supply [9]. The purposes of the study, this paper presents, is to investigate the effect of power quality to the industries. The benefits are the collection of real site data for use as power quality event examples in future research and the forming of an impression of the level of understanding of power quality in the industry. The other benefit include the education of industry people on power quality issues and the significant of high quality supply to the industry. This case study and survey involving of 10 industrial customers at the industrial zone selected. The survey also observed factory operation, products, equipment and processes used in production. The author also described the significant of power quality monitoring system and mitigation strategies by industries. The quality of power supply has caused a direct Mohd Izhwan Muhamad is with Dept. of Elec. & Elect. Eng, Faculty of Engineering, UPM Serdang, Selangor. (e-mail: ewanmuhamad@gmail.com). Norman Mariun is with Dept. of Elec. & Elect. Eng, Faculty of Engineering, UPM Serdang, Selangor. (e-mail: mariunn@ieee.org). Mohd Amran Mohd Radzi is with Dept. of Elec. & Elect. Eng, Faculty of Engineering, UPM Serdang, Selangor. (e-mail: amranmr@ieee.org). 1-4244-1470-9/07/$25.00 ©2007 IEEE. economic impact to many industrial customers. The effects of power quality can be shown up in many aspects of industrial operations. This case study also involving a monitoring, collecting and analyzing data of power quality problem for the selected period of time. This case study is to observe the effects of voltage disturbance especially voltage sag that occurred to the factories and industries. II. LITERATURE REVIEW The term power quality from [1] refers to a wide variety of electromagnetic phenomena that characterize the voltage and current at a given time and at a given location on the power system. The increasing application of electronic equipment used in the industries that can be sensitive to these phenomena has heightened the interest in power quality in recent years. The increasing emphasis an overall power system efficiency, adjustable-speed motor drives and shunt capacitors for power factor correction to reduce losses [2]. This is results many people concerned about the future impact on system capabilities. Nowadays, many things are now interconnected in a network. Integrated processes mean that the failure of any component has much more important consequences. Power quality monitoring is necessary to characterize electromagnetic phenomena at a particular on electric power circuit [1], [19]. In that case, the objective of the monitoring is to diagnose incompatibilities between the electric power source and the load. It is also to evaluate the electrical environment at a particular location to develop a power quality baseline. Monitoring also may be used to predict future performance of load equipment or power quality mitigating devices [1]. There are several important reasons to monitor power quality. The primary reason is economic; particularly if critical process loads are being adversely affected by electromagnetic phenomena [4]. Effects on equipment and process operations can include misoperation, damage, process disruption and other such anomalies. Such disruptions are costly since a profit-based operation is interrupted unexpectedly and must be restored to continue production. In addition, equipment damage and subsequent repair cost both money and time. Product damage can also result from electromagnetic phenomena requiring that the damaged product either be recycled or discarded, both of which are economic issues. THE EFFECTS OF POWER QUALITY TO THE INDUSTRIES Mohd Izhwan Muhamad, Norman Mariun,Senior Member, IEEE and Mohd Amran Mohd Radzi, Member IEEE The 5 th Student Conference on Research and Development –SCOReD 2007 11-12 December 2007, Malaysia