| With the wide application of modern power electronics equipments, more and more attention from both electrical engineers and customers are increasingly paid to the voltage sag as one of the power quality problems. As the most important load of Xing Shikou substation, Shougang NEC Electronics Co. (SGNEC), manufactures Semiconductor Devices, celled for strict electric power quality. Based on some voltage sag accident happened on Xing Shikou substation and the basic concept of voltage sag, this paper presents the cause of the voltage sag and identifying information. Some calculating method of voltage sag are compared after calculating the characteristic value of voltage sags. Finally combined with the results some measures of suppressing probability of voltage sags in Xing Shikou substation are proposed.
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