Grounding Safety Analysis of Indoor Extra High Voltage Substations Under Raft Foundation

• Main Authors: CHENG,MING-FANG, 鄭茗方
• Other Authors: CHO,MING-YUAN
• Format: Others
• Language: zh-TW
• Published: 2019
• Online Access: http://ndltd.ncl.edu.tw/handle/p9s8ak

碩士 === 國立高雄科技大學 === 電機工程系 === 107 === Substation is a very important part of Power Supply System. To ensure of the quality of the supplied power and safety of the staff member, it is necessary to have a well-designed grounding system. If the actual mesh voltage and step voltage generated by the electrical substation is lower than the permissible touch and step voltage, and tolerable shock duration is higher than the fault clearing time, it means the grounding system of the electrical substation is safe. This thesis is based on the following standard and software to run the calculation and simulation:IEEE Std.80,2000 - IEEE Guide for safety in AC substation grounding、Finite Element Analysis of ETAP and MATLAB . And then to analyze that the actual mesh voltage and step voltage generated by the electrical substation is lower than the permissible touch voltage with/without ground grid and ground rod under Raft foundation for an Extra High Voltage Substation. Furthermore, by comparing with soil resistivity, surface layer resistivity, depth and range interval of ground grid conductors, quantities of ground rod and shock duration affect permissible touch to simulate effort of safety under two kind grounding type. This study can provide a reference for the Taipower on dealing with similar cases.