Analysis and Suppression of Switching Transient in Underground Cable Systems
| Autor: | Chen-Han Wu, 吳承翰 |
|---|---|
| Rok vydání: | 2013 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 101 Following the development of urbanization in recent years, underground cables have gradually replaced overhead power cables. This is primarily because overhead cables obstruct cityscapes, are easily affected by natural disasters, and occupy substantial space in areas with numerous buildings. However, when compared to overhead cables, the capacitance to ground for underground cables produces comparatively more severe transients when switching. These intense transients tend to influence the cable equipment beyond it’s tolerance level, causing failure. Based on an existing underground cable system located in Taiwan, numerous case samples were developed in this study for performing simulations and analyses. Electromagnetic transient analysis software (ATPDRaw) was used to establish a model of a comprehensive underground power cable system. Actual system parameters were then entered into the simulation program to determine the completeness of the model and the correctness of the outcomes. Subsequently, simulations were conducted based on different operation cases and system conditions, including the engagement time of the circuit breaker and whether line potential transformers were installed in the cable. The simulation results were then observed and analyzed. Finally, this study discuss three methods for reducing switching transients, including choosing the best switching angle, installing line potential transformers in all three phases and installing closing resistor. These methods endeavor to reduce the impact of overvoltage caused by switching, preventing damage to underground cables and other relevant equipment, thereby prolonging the cable lifespan. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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