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Method for detecting minimum bending radius of cable

A technology of bending radius and detection method, applied in the direction of mechanical diameter measurement, etc., can solve problems such as the inability to detect the minimum bending radius of cables

Active Publication Date: 2021-04-20
STATE GRID BEIJING ELECTRIC POWER +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The main purpose of this application is to provide a method for detecting the minimum bending radius of cables, so as to solve the problem that the minimum bending radius of cables cannot be detected in the prior art

Method used

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  • Method for detecting minimum bending radius of cable

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Select a cable with an outer diameter of 50mm as a sample and use the above detection method for the minimum bending radius of the cable to detect. When the cable is wound to a disc with a radius of 510mm, the sheath will be damaged. When the cable is wound to a disc with a radius of 530mm, the sheath will be damaged. If the sheath is not damaged, take a disk with a radius of 520mm and wind the cable onto the disk. If the cable sheath is damaged, the minimum bending radius of the cable is 515mm.

Embodiment 2

[0034] Select another cable of the same batch with an outer diameter of 50mm as a sample and use the above detection method for the minimum bending radius of the cable for detection. When the cable is wound to a disc with a radius of 540mm, the sheath will be damaged. The sheath is not damaged when the disc is used. Take a disc with a radius of 550mm and wrap the cable on the disc. If the cable sheath is not damaged, take a disc with a radius of 545mm and wrap the cable on the disc. If the cable sheath is damaged, the minimum bending radius of the cable is 542.5mm.

Embodiment 3

[0036] Select another cable from the same batch with an outer diameter of 50mm as a sample and use the above-mentioned detection method for the minimum bending radius of the cable to detect. When the cable is wound to a disc with a radius of 620mm, the sheath is damaged. The sheath is not damaged when the disc is used. Take a disc with a radius of 630mm and wrap the cable on the disc. If the cable sheath is not damaged, take a disc with a radius of 625mm and wrap the cable on the disc. If the cable sheath is not damaged, take a disc with a radius of 622mm and wind the cable onto the disc. If the cable sheath is damaged, the minimum bending radius of the cable is 621mm.

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Abstract

The invention provides a method for detecting the minimum bending radius of a cable, and the method comprises the steps that a to-be-detected cable is sequentially wound on a plurality of cylinders with the radiuses from large to small till the to-be-detected cable is broken, and a first radius which is the radius of the cylinder corresponding to the broken to-be-detected cable is obtained; the to-be-measured cable is wound on a cylinder with the second radius, the second radius is the average value of the first radius and the third radius, and the third radius is the minimum radius of the non-broken cylinder of the to-be-detected cable after winding; wherein the minimum bending radius of the to-be-detected cable is the average value of the first radius and the second radius under the condition that the to-be-detected cable is broken; and under the condition that the to-be-detected cable is not broken, the step S102 is repeated until the to-be-detected cable is broken, and the minimum bending radius of the to-be-detected cable is the average value of the first radius and the second radius. The method solves the problem that the minimum bending radius of the cable cannot be detected in the prior art.

Description

technical field [0001] The present application relates to the technical field of minimum bending radius measurement, in particular, to a method for detecting the minimum bending radius of a cable. Background technique [0002] Since the smooth aluminum sheathed cable does not need the corrugation process, the outer diameter of the cable with the same conductor cross-section is smaller than that of the corrugated aluminum structure, which means that the outer structure requires fewer raw materials and lower costs. The cable will inevitably bend during transportation, laying and operation, which will cause the aluminum sheath to squeeze inward; at the same time, as the external temperature changes and the current carrying capacity of the conductor changes, thermal expansion and contraction will occur inside the cable. The phenomenon makes there is a certain pressure between the aluminum sheath and the insulation. Cables with a smooth aluminum sheath structure are more prone t...

Claims

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Application Information

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IPC IPC(8): G01B5/08
Inventor 赵雪骞钱梦迪陈平门业堃任志刚郭卫于钊滕景竹潘泽华
Owner STATE GRID BEIJING ELECTRIC POWER