Risk Cost Analysis and Impact of Dip Voltage, Case Study of The Food and Beverage Industry in East Java

Power quality and voltage stability are the main indicators of customer satisfaction because it influences business operations. Based on the results of the 2016 customer satisfaction survey by Markplus.inc, some industrial customers complain of voltage stability, especially related to dip voltage. Industrial customers complained about this dip voltage due to the loss of the company's operational tools. Dip voltage is a problem that must be resolved by industrial customers and electric utility companies. For electric utility companies, dip voltage greatly affects the sale of electricity that is not optimal because the dip voltage has an impact on the operation failure in industrial machinery. In addition, the dip voltage also has a negative effect on the service image of the electric utility company on the priority customer side. For this reason, the voltage dip needs to be handled seriously. According to IEEE 1159-1995, Dip voltage of 20 kV is a decrease in AC voltage of 2 kV up to 18 kV for 0.01 seconds until 60 seconds (for a frequency of 50 Hz). This dip voltage is caused by lightning, network interference, the effect of switching, motor operation, and sudden load changes. Dip voltage causes a huge financial impact on industrial consumers. In this paper, a dip voltage case study will be evaluated at The Food and Beverage Industry in East Java. The financial loss of industrial customers reaches 328,000 USD or 4.7 billion Rupiah in one dip voltage event. This is because customers have suffered a production failure so they have to restart their production process. They also have to dispose of large quantities of raw materials due to product failure due to the dip voltage. For this reason, it is necessary to formulate a proposed management model in solving this dip voltage problem. This paper also offers proposed steps that can be taken by electric utility companies in suppressing the amount of dip voltage so that the electricity supply becomes more qualified. In accordance with the evaluation of priority and risk management matrices, the results show that the steps are appropriate and can be implemented in reducing the number of dip voltages.