Abstract
The decline in the quality of electric power becomes a serious problem in the industrial sector and affects a significant cost loss. One of the dominant power quality problems is the voltage dip. The use of electric motors in an industry becomes one of the main causes. This paper discusses the investigation on voltage dip problems at a cement factory at Kupang,, Indonesia. The cement factory uses an induction motor as the prime mover and is proven to trigger a voltage dip because of its high starting current. Based on the observed data of the disturbance, a single line diagram was created. The single line diagram was analyzed using an equivalent circuit. It was found out that as the induction motor was started, it created a very significant voltage drop as of 20.43 % to 62.26 %. The voltage dip correlated to the capacity of the induction motor used. The larger the capacity of the induction motor, the larger the voltage dip occured.
Highlights
The availability of qualified electrical energy is one of the important factors for the sustainability of the operation of an industrial estate
The quality of electrical energy is determined by two main factors: The availability of continuous energy or minimal power outages and electrical energy characteristic
The definition of a voltage dip according to IEC (International Electrotechnical Commission) is a brief interruption of a sudden termination of voltage at all phases at a certain point in the power supply system below the threshold disturbance followed by restoration after a short time interval
Summary
The availability of qualified electrical energy is one of the important factors for the sustainability of the operation of an industrial estate. The quality of electrical energy is determined by two main factors: The availability of continuous energy or minimal power outages and electrical energy characteristic. The poor quality of the electric power, can stop the production process, especially in industries using sensitive loads such as control equipments. If this problem is not handled properly, a significant financial loss will be resulted. Based on the observed disturbance data on a regular basis, the cause and effect of the voltage dip was identified. These data were used as parameters in the designated equivalent circuit. Voltage sags is one of the major problems in the industry and has provided significant financial losses [1, 2]
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