High-voltage power transmission line construction stringing early warning method based on precise positioning

Abstract

The invention relates to a high-voltage power transmission line construction stringing early warning method based on precise positioning, in particular to a method for giving an early warning signal when the real-time sag in the extra-high-voltage wiring construction stringing operation process exceeds a safety value range. A set of high-voltage power transmission line stringing early warning method is designed on the basis of a stress sag curve. In the method, a tension sensor is used for monitoring the conducting wire stress in the wire drawing process; the real-time conducting wire sag in the wire pulling process is analyzed through a stress sag relationship curve; the safety judgement is made through the comparison with the sag safety value given by relevant regulation requirements; and early warning signals are given out under the condition that the real-time sag exceeds the safety value range. Meanwhile, sensors arranged at the head and tail ends of the system can transmit real-time axial tension data to an upper computer; differences between the two tension data horizontal components are calculated; and an early warning signal can also be given out if the condition that tension change differences at the two ends are great is found.

Description

technical field [0001] The invention relates to an early warning method for high-voltage transmission line construction tightness based on precise positioning. It specifically relates to such a method, which sends out an early warning signal when the real-time sag exceeds the safe value range during the tightening operation of ultra-high voltage stringing construction. Background technique [0002] During the design of ultra-high voltage transmission lines and the construction of tight lines, the stress and sag of the conductors are crucial to the safe power supply and operation of the transmission lines. If the stress of the overhead line is too large, it will generate excessive tension on the tower, cross arm and insulator string. When the maximum allowable stress is exceeded, the line may be broken or the tower may collapse; If some conductors or other objects are in contact, a phase-to-ground short circuit will occur and cause a power outage. It can be seen that the sa...

AI Technical Summary

Problems solved by technology

Although this is convenient and quick, the consequences of misjudgment are very serious, because the sag value of overhead lines in transmission lines is very important, too large or too small sag will cause serious consequences

If the sag during the pulling process is not accurately monitored, it is very likely that the pulling wire will break, causing safety problems for the tower, wires and personnel

[0007] The second is that in the process of tensioning the wires of conventional tension stringing projects, the size of the stringing stress is controlled by setting up observation points to calculate the observed sag, but there are inevitable errors in observation or calculation, and in some cases it is even impossible to observe

[0008] The third is that the existing research lacks accurate simulation of ultra-high voltage transmission lines, and it is impossible to accurately calculate the tension at each point of the overhead line during the construction process of the transmission line tension wire in a specific construction project

Therefore, in a specific engineering project, the wiring construction is mainly carried out according to the experience of the construction personnel, which brings many hidden dangers to the quality and safety of the wiring project

[0009] Fourth, in the current stringing construction, there is a lack of analysis of the relationship between the stress values ​​at the line setting and the tightening position. If the middle sliding clamp is blocked, the stress value change at the line setting and the stress value at the tightening position will not be synchronized, resulting in The thread tightening process has been going on, and finally a thread breaking accident occurred

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