A method for measuring cable insulation thickness and eccentricity and corresponding measuring device

Abstract

The invention relates to a method and a corresponding device for measuring the cable insulation thickness and eccentricity. The method includes the following steps: (1) selecting and manufacturing a testing piece of a cable to be measured; (2) placing the manufactured testing piece on a portable cable measuring device, determining the circle center and fixing the testing piece; (3) rotating the testing piece to determine the thinnest point and recording the smallest thickness values of an insulation layer, an inner semi-conductive layer and an outer semi-conductive layer; (4) rotating the testing piece to determine any other N locating measuring points, and recording four values of the insulation layer, the inner semi-conductive layer and the outer semi-conductive layer of each locating measuring point; and (5) calculating three eccentricity values and three deviation degree values of the insulation layer, the inner semi-conductive layer and the outer semi-conductive layer of the testing piece of the cable according to a formula. The method and the corresponding device can remove manual errors and improve measuring efficiency and measuring result accuracy. By means of the method, the problem in a traditional method that the cable with the insulation layer, the inner semi-conductive layer and the outer semi-conductive layer even in thickness but deviated in circle centers can not be detected is solved, and a gap in the field of cable detecting is filled.

Description

technical field [0001] The invention relates to the field of detection of cable insulation layer thickness, inner and outer semiconductive layer thickness and eccentricity, in particular to a method for measuring cable insulation thickness and eccentricity and a corresponding measuring device. Background technique [0002] At present, when using traditional devices and measurement methods to measure the thickness of the cable insulation layer, the thickness of the inner and outer semiconducting layers, and the eccentricity, the following problems may occur: [0003] 1. There are many manual operations in the process of eccentricity measurement, which lead to large measurement errors caused by human factors, such as manually judging the position of the minimum thickness, manually moving the test piece, manually estimating the position of the center of the circle, and manually delineating the test line of the test piece (Usually 6 lines), resulting in multiple intersections be...

AI Technical Summary

Problems solved by technology

[0003] 1. There are many manual operations in the process of eccentricity measurement, which lead to large measurement errors caused by human factors, such as manually judging the position of the minimum thickness, manually moving the test piece, manually estimating the position of the center of the circle, and manually delineating the test line of the test piece (Usually 6 lines), resulting in multiple intersections between the extension lines of the detection lines, thus proving that the selected detection lines do not pass through the same radius of the center of the circle, resulting in errors in the detection results, reducing detection accuracy and detection efficiency

Moreover, only the six detection lines drawn on the test piece are measured, resulting in relatively large measurement limitations, and it is impossible to measure any point

[0004] 2. The eccentricity measurement results obtained by using traditional methods can only represent the uniformity of the thickness of the cable insulation layer and the inner and outer semiconducting layers, but cannot represent the deviation of the insulation layer and the inner and outer semiconducting layers from the center of the circle. Therefore, for the insulation layer and the inner and outer semiconducting layers The traditional eccentricity measurement method cannot detect the abnormality of the cable with a uniform thickness of the conductive layer but deviates from the center of the circle, resulting in inaccurate test results, products with problematic quality entering the market, and even affecting the safety of power grid operation

[0005] 3. When measuring, it is necessary to manually draw the detection line on the test piece, and then use a measuring tool to measure the corresponding detection line. During the measurement process, a reading microscope or a projector with a magnification of at least 10 times is required as the measurement device. Due to the volume of these two devices It is large, expensive and not portable, so it cannot be carried during the sampling process. It needs to rely on the supplier's laboratory and testing equipment, and cannot guarantee the accuracy and efficiency of the test

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