Study the Overcurrent Protection of Railway Electric Traction Substation and the Faulted Location of Power Supply Feeder

• Main Authors: Mu-Ming Shen, 沈牧民
• Other Authors: Jyh-Cherng Gu
• Format: Others
• Language: zh-TW
• Published: 2016
• Online Access: http://ndltd.ncl.edu.tw/handle/q8y99w

碩士 === 國立臺灣科技大學 === 電機工程系 === 104 === Railway electric traction is an important tool for long way transportation in our country. It plays a key role not only for people daily life but also for military purpose. Hence, both the security and dependability of electric railway power supply system are well noted. However, due to such as the natural disasters, human error and devices malfunction, the system fault may occasionly happen and is unpredictable and unavoidable. To guard the operator and systems safely a coordinated protection system is required. The main purpose is to minimize the fault duration and losing power zone once the fault occurs. As the railways running through the urban and suburban areas, the locomotive of trolley wire may interrupt because of the different reasons. It is the way to guarantee the reliability and the security of the power supply system by quickly fault detection and isolation. First of all, the tranditional overcurrent protection scheme is intensively reviewed. Then, an improved protection scheme and relay setting are proposed mainly by aid of IED which enbed with IEC 61850 communication capability. The logic programming, Zone Selective Interlocking(ZSI) and Breaker Failure Protection(BFP) functions will all present. Next, there are several methods aim to different locomotive power fedding scheme have been introduced to identify the fault location of trolly wire. Finally, an innovation intelligence double-ended method is proposed for direct power feeder scheme. The fault resistance and the traction load condition may impact the estimation of fault location. However, our innovation method can handle the mention possibility. The simulation shows that the fault location estimation error not more than 0.07%.