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This paper proposed a new method to locate the source loads experience a production outage if the voltage sag of voltage sag from the measurements taken at the point of magnitude and duration are outside the load ride-through common coupling (PCC) which is the point of connection capabilities. between utility and customer in a power distribution system. The proposed method uses the RMS current and power factor angle, Locating ie source of voltage sag is important before any which are the measured parameters at the PCC. The product of voltage sag mitigation technique is done to eliminate te sag. A the RMS current and the power factor angle at the PCC is then wrong mitigation solution can aggravate the voltage sag used to locate the source of voltage sag. A graph of this product problem because only after information about a voltage sag against time is plotted and by examining the value of the product source location is available, can power-quality troubleat the beginning of the sag, the voltage sag source location is shooting, diagnosis and mitigation be carried out. The determined. A positive value indicates the source of voltage sag is advantage of locating the source of voltage sag is that any from the customer side and a negative value indicates the source disputes among the major responsibility party can be resolved of voltage sag is from the utility side. The proposed method has fairly [5]. been verified by simulations and the results are proven to be accurate.To date only two references cite the methods to locate the sources of voltage sags from the literature. A method using the Keywords-Voltage sag, power quality, distribution system, real disturbance power and disturbance energy to determine which current component) side ofa recording device the voltage sag originates is based on the concept that active power tends to flow away from a nonlinear load [6]. This concept is translated in terms of disturbance power and disturbance energy to determine on I. INTRODUCTION which side of a recording device the voltage sags originate. The directions of the disturbance energy as well as the disturbance Voltage sag is a temporary decrease in the RMS voltage of real power flow are used to locate the voltage sag source. magnitude between 0.1 -0.9 p.u and with duration of mostly The method will rely on the degree of confidence of both the less than I second. Its frequency of occurrence is between a disturbance power and disturbance energy. Thus, the degree of few tens and several hundreds times per year [1]. It is the most confidence will be reduced if results from disturbance energy important power quality problem facing many industrial and disturbance power do not match. Another most recent customers since equipment used in modern industrial plants technique to locate the origin of voltage sag is by employing such as process controllers and adjustable speed drives is the slope of the line fitting parameters of current and voltage becoming more sensitive to voltage sag. The causes of voltage during voltage sag [5]. T...

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