A device and method for making needle point defects for cable testing

Abstract

The invention discloses a device and method for making a needle defect for a cable test. The device comprises a cable clamp, a steel needle and a needle pushing device. The cable clamp is provided with a cable groove in the axial direction. Through holes are formed in the cable clamp and are located on the symmetry line of the cable groove. The axis of each through hole is perpendicular to the axis of the cable groove. The cable clamp is divided into two modules along the symmetry line. The two modules are fixedly connected through screws. The needle pushing device comprises a pushing shaft and a micrometer caliper, wherein the rotatable pushing shaft comprises a rotating nut and a pushing threaded rod which is connected with the rotating nut in a threaded mode, a groove is formed in the front end of the pushing threaded rod, the rotating nut is connected with an adjusting nut of the micrometer caliper in a transmission mode, the rotating nut and the adjusting nut are identical in outer diameter, and the thread pitch of a micrometric threaded rod of the micrometer caliper is identical to that of the pushing threaded rod. The steel needle is stabbed into a cable insulating layer through the pushing device, and the stabbing depth of the steel needle is controlled through reading of the micrometer caliper. The device and method for making the needle defect for the cable test have the advantages that the cable needle defect is conveniently and rapidly manufactured in a high-precision mode.

Description

technical field [0001] The invention relates to a device for making a needle point defect for a cable test, and also relates to a method for making a needle point defect for a cable test, which belongs to the technical field of electric power testing. Background technique [0002] With the advancement of material technology and processing technology, XLPE power cables have been widely used in transmission and distribution lines, and have begun to gradually replace traditional oil-impregnated paper insulated cables, but their test technology lags behind cable manufacturing and application technology. , When selecting test items and test methods, it is necessary to proceed from the actual operation of the power cable, and fully consider the equivalence and reliability of the test methods, as well as the transportation and storage of the test equipment and the flexibility of the test methods. At present, there are many kinds of test methods applied to the insulation detection o...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a device for making a needle point defect for a cable test, which solves the problems of inconvenient manufacture of a needle point defect for a cable test in the prior art, low pass rate, and difficulty in controlling the penetration depth of the needle point leading to test results. inaccurate technical issues

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