Abstract
The on-line monitoring of power transmission line mainly refers to the observation of load parameters such as wind speed and ice coating thickness, and not many researches about monitoring and safety status are conducted directly targeting their stress states; however, through when calculating the stress status of structure via load, the simplified assumptions in calculation model and load model introduce some errors. This thesis realized real-time monitoring to stress states of main stress poles of iron tower based on the 36 strain monitoring points distributed on the power transmission iron tower; in addition, based on the analysis on monitoring data, this thesis evaluated the safe using performances of the iron tower.
Highlights
The traditional main on-line monitoring objects include wind speed, equivalent icing thickness, image/video, pole tower inclination, aeolian vibration, conductor temperature, conductor sag, circuit windage yaw, conductor galloping, field pollution grade, etc
Along with the constantly increased attention of power grid to the essential safety of iron tower, the observation only to external load of iron tower cannot meet requirements for high reliability performance index any longer, and the power grid system inner has gradually started the research on monitoring of in-service stress of iron tower, and has obtained some achievements[5]
Huang Xinbo[6] and Ji Xiangke[7] have implemented monitoring to the stress of power transmission iron tower based on the strain measurement technology of optical fiber, and has obtained relatively good test data
Summary
The traditional main on-line monitoring objects include wind speed, equivalent icing thickness, image/video, pole tower inclination, aeolian vibration, conductor temperature, conductor sag, circuit windage yaw, conductor galloping, field pollution grade, etc. Zhang Xuan[8] has monitored the iron tower stress with vibrating wire strain gauge, and relatively speaking, the price of resistance type strain gauge is lower, and it can be installed on the surface of steel structure conveniently, and will not damage the iron tower members[9-12]. According to the sort descending, the top 18 poles with relatively high stresses were taken out as measuring points to arrange poles (see Table 1) This tower refers to angle steel tower, and all poles refer to angle steel.
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