Analysis of Characteristics of Induction Circulating Currents on 345kV GIS and Their Affections Assessment

• Main Authors: Yi-Chang Kuan, 管益章
• Other Authors: 周至如
• Format: Others
• Language: zh-TW
• Published: 2009
• Online Access: http://ndltd.ncl.edu.tw/handle/t3zcwv

碩士 === 國立臺北科技大學 === 電機工程系研究所 === 97 === The modern power equipments require not only reliability and security, but also many other requirements such as the conciseness of structures to minimize the size of substations, the security of operators, maintenance of equipments and that the threat to the environment must be reduced. These requirements are essential topics to be considered so as to provide safe and reliable electric power. The induced circulation current in the case of gas insulation switchgear (GIS) is quite large. If the equipment are not well grounded or the interconnected conductors are not well treated, this induced circulation current will flow, via the earth ground, to other buses or control panels and then lead to the faults of equipments and even pose threat to the maintainers of equipments. This thesis is aimed to analyze the induced circulation current in the cases of 345kV GIS and ground wires. The analysis considers different load patterns, power supply structures, materials of GIS cases and the grounding types. The circuit model eased on the Alternative Transient Program (ATP) is first constructed. Secondly, this thesis analyzes the current in each section of GIS cases and ground wires at different load patterns with different grounding types are analyzed. Besides, the power consumption can be assessed on the basis of different induced circulation current, which can be obtained by changing the materials of GIS cases. Finally, based on these analysis results, this thesis assesses their influence on personnel and equipment. The data in this thesis can provide reference for further studying power supply scheme and design of GIS and protection strategies for GIS.