Sag observation method for power transmission line engineering construction

Abstract

The invention relates to a sag observation method for power transmission line engineering construction. A mechanical model of sag control by a tension force in a tension state is established and applied forces on overhead lines of all towers are calculated based on formulas; and according to to-be-tightened-up zone, an observation grade is determined and a wire tightening-up field is arranged, a tension force value displayed by a tightening-up end tension measurement device corresponding to the designed sag by the observation grade is calculated, winching is started, the tension measurement device is observed; and the sag is controlled. According to the invention, from the perspective of the relation of the tension force, the stress, and the sag, the tension force is introduced into the overhead line tightening construction, so that the circuit stress control becomes simple and direct. Meanwhile, a problem that the sag can not be observed from the top or bottom of the overhead line tower at special areas like the high mountain areas can be solved.

Description

technical field [0001] The invention relates to a sag observation method for transmission line engineering construction, which relates to the field of transmission line monitoring. Background technique [0002] Traditionally, there are four commonly used methods for observing the conductance and ground sag of overhead transmission lines, generally including anomaly method, equal length method, angle method and head-up method. Generally, the equal-length method or the abnormal method is preferred. When the equal-length method or abnormal method cannot be used due to objective conditions, the angle method can be used. Only when the above three methods cannot be used, the head-up method is used. Before observing the sag, you should refer to the horizontal section diagram of the line to understand the terrain and sag conditions, select the appropriate sag observation method based on the actual situation, and calculate the initial elongation according to the line pole tower pos...

AI Technical Summary

Problems solved by technology

[0012] (1): In special areas such as mountains and jungles, no sag can be observed on the tower and under the tower of the overhead line, which brings challenges to the safety of the operating stress of the overhead line, and the traditional method is no longer applicable

[0013] (2): The essence of the traditional sag observation method is to directly observe the sag. There is alrea

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