Comparative analysisof grounding systems formed by MV cable lines with either uninsulated or insulated metal sheath(s) |
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| Authors: | Ljubivoje M Popović |
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| Affiliation: | 1. Golder Associates Inc., 500 Century Plaza Drive, Suite 190, Houston, TX 77073, USA;2. Fugro Consultants, Inc., 6100 Hillcroft Ave, Houston, TX 77081, USA;3. Department of Civil Engineering, IIT Hyderabad, Yeddumailaram, Telangana 502205, India;4. School of Civil Engineering, Purdue University, West Lafayette, IN 47907-1284, USA;1. State Key Laboratory of Power Transmission Equipment & System Security and New Technology, The Electrical Engineering College, Chongqing University, Chongqing 400044, China;2. State Grid Henan Electric Power Research Institute, Zhengzhou 450052, China;1. School of Electrical Engineering, Southeast University, Nanjing 210096, China;2. State Key Lab of Power System, Dept. of Electrical Engineering, Tsinghua University, Beijing 100084, China;1. Faculty of Engineering, Multimedia University, Malaysia;2. Faculty of Computer Science and Electrical, University of Maribor, Slovenia;1. Department of Electrical and Electronic Engineering, Universiti Teknologi Brunei (UTB), Brunei Darussalam;2. Berakas Power Management Company, Brunei;1. TUBITAK MRC, Energy Institute, Ankara Branch, Ankara, Turkey;2. Baskent University, Department of Electrical and Electronics Engineering, Ankara, Turkey |
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| Abstract: | It is well known that medium-voltage (MV) paper-insulated cables essentially reduce the potentials appearing during a ground fault in substations located in urban surroundings. This is explained by the fact that these cables usually (normally) have an uncoated metallic sheath. Due to this, MV cable lines leaving a high-voltage/middle-voltage (HV/MV) substation act as long external grounding electrodes and spontaneously form one very large and complex grounding system around this substation. Cables with an insulated metallic sheath however, are progressively being more applied in contemporary power distribution practice. Consequently, the following quite logical question arises: how will a cable with such constructive characteristic influence the general conditions for solving the grounding problem of distribution substations, especially of those working in high-voltage (HV) networks with directly grounded neutral(s)? The analysis performed in this paper shows that, when applied these cables spontaneously form a grounding system which also exhibits excellent grounding performances. |
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