Cable curvature measuring method

Abstract

A cable curvature measuring method comprises the following steps: S1: acquiring the distances between any three adjacent points and an observing points on a cable curve, and calculating the initial curvature rho' on the cable curve by utilizing a three-point method according to the three distance information; S2: acquiring the image information of the cable curve, and obtaining the compensation curvature rho'' according to the image information; and S3: obtaining the accurate curvature rho according to the initial curvature rho' and the compensation curvature rho''. According to the cable curvature measuring method, the cable curve information is extracted from a cable curve image. According to the cable curvature measuring method, the cable curve information is extracted from the cable curve image, the cable curvature obtained by a laser ranging method can be compensated according to the information, the all calculations are implemented in a digital processing unit, so that the cable curvature measuring method has the advantages of high precision, strong instantaneity, high processing speed, and long-distance measurement under the complicated topography.

Description

technical field [0001] The invention relates to a method for measuring the bending degree of a cable. Background technique [0002] At present, cross-linked polyethylene insulated cables are commonly used in power transmission cable projects. When the cables are installed and laid, tensile forces in different directions will be generated at each curve of the bending section, resulting in pressure that causes damage to the cables. The smaller the bending radius of the cable, the stronger the compression and stretching of the cable core, and the greater the damage to the insulation of the cable core. Especially high voltage cables may cause irreversible damage. The cable design regulations have clear regulations on the bending radius. For example, when laying 110KV cables, the bending radius is required to be 20D (D is the diameter of the cable body), and the bending radius is required to be 15D during operation. [0003] During the construction process of transmission cable...

AI Technical Summary

Problems solved by technology

In order to obtain the bending degree of the cable, a traditional method is to measure manually with a measuring ruler, but some construction areas have complex terrain and many pipelines, and there are limited occasions where manual hand-held measuring rulers can be used for measurement; another method is to use laser ranging The instrument measures the points on the curved surface of the cable, and calculates the obtained length and angle data to obtain the bending value. This method is easy to implement and widely used, but many factors will affect the accuracy of this method, such as sensors The initial zeroing error of the sensor, the random error of the sensor, and the accuracy of reading the sensor data; another method is to use the image processing method, but the image processing method has high hardware requirements on the one hand, and on the other hand, the algorithm is complex and generally in Realized on PC, low immediacy

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