接觸網(wǎng)受電弓系統(tǒng)的一個新的非接觸式故障診斷方法外文翻譯、中英對照、英漢互譯-文庫吧
2024-10-14 00:43 本頁面
【正文】 f contact line. For an efficient wear measurement of contact wire, a new multicamera based optical inspection system was proposed. Different cameras were mounted at different positions of the roof of the vehicle and overhead contact was visually inspected from different angles. Abrasion on pantograph slide was detected by using edge detection algorithm. Discrete wavelet and Hough transform based method was applied to image of pantograph slide and abrasion related features were extracted. The five kinds of edge detection algorithms were evaluated for the examination of the pantograph slipper images. The results show that Canny edge detection algorithm gives better results than other algorithms. The contact performance between pantograph and overhead line affects the current collecting performance. An image processing based method was proposed to monitor the contact performance. In recent years, there is more relevance about using contact less condition monitoring of railway systems. However, the developed system is suitable for laboratory applications. In this paper, a new method is proposed to monitor the contact between pantograph and catenary system. The proposed method takes one frame from a video in each step and then the Canny edge detection algorithm extracts edges from image frame. The position of overhead wire is determined in the edge image. This position is used to detect the contact force between pantograph and overhead wire. The obtained signal from position of contact wire is analyzed by two statistical parameters and anomaly in the position is detected. SLIDING CONTACT BETWEEN PANTOGRAPH AND OVERHEAD WIRE The contact between pantograph and overhead wire, which is found on the roof of an electrified train, allows the collecting current from overhead feeding conductor. Contact wire takes the electric from feeder station that connected at regular space. The contact wire is connected to the messenger wire using dropper wires. The continuity of contact wire is important to ensure better electrical performance. One way to maintain contact is to increase the uplifting force. However, it increases the resonance of overhead wire and this causes the loss of the contact and wear of contact wire. When the contact has been lost or a gap has been occurred, the power of train will be interrupted. The loss of the contact also 3 causes the arcing between contact wire and pantograph. For high speed train, current collection is based on good contact performance. On a straight way, the contact wire moves slightly to the left and right corner of pantograph. The contact wire applies an impression to different points of the pantograph. Such a system extends the life time of a pantograph. The sliding contact between pantograph and overhead wire consists of three layers. These layers are copper wire, layer of oxide and carbon, and thin film of water. The conduction mechanism is realized by using thin film of water. The gap between two electrodes should be maintained. However, the thin film of water can get frozen in winter and the sliding contact may extend. The sliding contact is affected from weather condition. The harsh winter condition affects lifting force of pantograph and this leads to appearance of arcing. Thereafter, the contact wire and pantograph can cause damage. CONTACTLESS FAULT DIAGNOSIS APPROACH FO
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