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Wang H.-P.,XJ Electrical Co. | Shi Z.-H.,XJ Electrical Co. | Zhao H.,Henan Yanjin Power Bureau | Tian E.-S.,XJ Electrical Co. | And 2 more authors.
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control

As 110 kV power supply system of submerged arc furnace is generally supplied by duplex winding transformers, some problems like low power factor, serious harmonic and unbalanced three-phase voltage appear. Currently, concentrated compensation at HV side or on-site automatic compensation at LV side is adopted to solve these problems in project. While concentrated compensation at HV side cannot solve serious harmonic and three-phase power unbalance problems and reactive power will severely loss; on-site automatic compensation at LV side will cause the problems of controller sampling error, serious radiation interference, insufficient capacitor output, and so on. This essay analyzes reactive power compensation problems at HV/LV side of submerged arc furnace and gives some suggestions as follow: reactive power compensation should be made at both HV side and LV side or tertiary winding of 110 kV submerged arc furnace transformer should be used as specific compensation filtering windings. Source

Li M.-C.,Shangqiu Electrical Power Supply Company | Wang Y.-P.,Shangqiu Electrical Power Supply Company | Li X.-W.,XJ Electrical Co. | Wang F.,Shangqiu Electrical Power Supply Company | Cai W.-F.,Shangqiu Electrical Power Supply Company
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control

Smart substation is an important foundation and pillar of strong smart grid. This paper describes the main differences between smart substation and digital substation, and simply introduces the system basic structure of smart substation, the function of intelligent primary equipment and the characteristics of intelligent devices and sequence control. The corresponding advanced application function of smart substation is emphasized. Suggestions for smart substation equipment maintenance, on-line monitoring and real-time analysis and diagnosis techniques, working ticket automatic management system and intelligent auxiliary control system are proposed according to the operation maintenance and emergency accident handling characteristic of smart substation. All of them are of certain reference significance for the development of smart substation and the stable operation of smart grid. Source

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