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2016China International Conferenceon Electricity Distribution (CICED 2016) XianSep. 2 Analysis of voltage sags causes and case analysis based on on-site data 1 LI WANG ,WENBO CHEN , CHAOJIE DING2, XUEYI ZOU1 1. 2. 1 Golden Cooperate Information & Automation Tech Co.,Ltd – China State Key Lab of Control and Simulation of Power Systems and Generation Equipment (Department of Electrical Engineering, Tsinghua University) Abstract: Voltage sag and short interruption are increasingly hot spots for the concern of power quality. This paper presents the application over ten years of more than a thousand sets of voltage-sag protection equipment by Golden Cooperate in China,covering power plant, petrochemical, coal chemical, chemical fiber and semiconductor industries. From the original data from on-site equipment and by data mining method, main causes of voltage sag are analyzed. The analysis results are presented according to various industries and geographical regions as well as case analysis are discussed. Finally conclusions are given. 1 Introduction 2 Main causes of voltage sag 2.1 Statistic method 2.2 Procedure of data collection 2.3Statistic results and analysis The main cause of voltage sags of thermal power plants and industrial users in each province are shown in figure 1-2. Fig 1 The main cause of voltage sags of thermal power plants in each province Fig 2 The main cause of voltage sags of industrial users in each province CICED2010 Session x Page1/2 Paper No xxx 2016China International Conferenceon Electricity Distribution (CICED 2016) XianSep. 2 3 Cases analysis 3.1 Case of coastal area 3.2Case of inland area 3.3Comparison of connecting to various voltage levels 3.4 Influence of voltage sag in distribution grid 4 Conclusion Voltage sags seriously influence the operation of sensitive industrial loads. This paper analyzes the main causes of voltage sags in different industries and different areas in China, by the original data and on-site survey. The result shows that the main causes of voltage sags in power plants is high-voltage transmission line faults, given the fact that the configuration and the protection of distribution network in the power plant are generally rather reliable, while in other industries the causes of voltage sags is mostly natural disasters and followed by the line faults of their distribution network. In addition, relevant natural disasters are mainly strong winds and severe snow in northwest and northeast in China, and lightning, typhoons and other severe convective weather in the southeast coastal region in China. Moreover, the reliability of distribution network significantly influences their industry users. The analysis results may offer a reference for sensitive industrial users particular in China to the treatment strategy of voltage sags. Key words: voltage sags, short interruption, cause of voltage sags, case analysis Author’s brief introduction and contact information Li Wang, (1987- ), master degree, Golden Cooperate information& automation technology Co., Ltd, research direction is power system relay protection and safety automatic device. Wenbo Chen, (1974- ), bachelor, engineer, Golden Cooperate information& automation technology Co., Ltd, research direction is DC power distribution, AC/DC hybrid microgrid, voltage sag protection. Chaojie Ding, (1991- ),master degree student in Department of Electrical Engineering, Tsinghua University. Research directionsare DC power distribution and demand response integration. Li Wang Mobile: 18921408752 Email: [email protected] Fax: 025-52103128-816 Address: No.28, Shengli Rd., Jiangning Economic Development District, Nanjing, China P.C.: 21110 CICED2010 Session x Page2/2 Paper No xxx