铁路电力架空线路常见故障的原因及查找方法（Causes and finding methods of common faults in railway power overhead lines）.doc

铁路电力架空线路常见故障的原因及查找方法（Causes and finding methods of common faults in railway power overhead lines） Causes and finding methods of common faults in railway power overhead lines Abstract: This paper mainly analyzes the probability of short circuit grounding fault in the railway overhead power line, and makes a systematic analysis of the causes and finding methods of these faults according to the work practice. Key words: overhead lines Short circuit grounding fault Reason Search method Electric power is an important energy in the production of railway transportation. It is closely related to improving transportation efficiency and ensuring traffic safety. The automatic block electric circuit, the power through circuit, the railway substation and the power distribution station form the power supply network, which is the important driving equipment of the railway. In power system, short circuit fault is the most serious and the most serious one in various system faults. The so-called short circuit, is the power system in all the abnormal phase, phase or phase (or neutral point direct grounding system) between the channel. For example, in transmission lines, insulators are broken down for some reason, and the insulation between the conductive phase and the ground is destroyed to form a pathway, which results in short circuit between phases. After short circuit fault happens, because the network total impedance is greatly reduced, it will produce short circuit current in the system several times even several times as much as the normal operating current. The strong short circuit current will cause serious consequences to the power supply circuit and power supply equipment. 1. Classification of short-circuit faults (1) inter phase short circuit fault: one is transient short-circuit fault (usually circuit breaker reclosing is successful); two is permanent short circuit fault (usually circuit breaker reclosing is not successful). Common faults are: short circuit fault of metal