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Special tool for elbow end cable test

A technology of cable testing and special tools, applied in the direction of testing dielectric strength, etc., can solve problems such as difficult for testers to judge cables, waste of materials, construction period, and low dielectric strength, so as to reduce labor intensity and operation risks, shorten workflow time, Guaranteed safety and effectiveness

Active Publication Date: 2012-01-11
HUAIBEI POWER SUPPLY COMPANY OF STATE GRID ANHUI ELECTRIC POWER +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The previous test method is to connect the iron wire with the pressure wire nostril in the elbow, and then lead the conductive part out of the elbow to carry out the pressure test. Moreover, the insulation distance between the iron wire and the elbow is not enough, so we use heat shrinkable insulation Tubes solve insulation problems
Therefore, there are many shortcomings and troubles in the past test methods:
[0004] First of all, it is very difficult to fix the iron wire on the cable head. Not only does it take a long time, but the contact is not reliable. Due to poor contact, it directly affects the accuracy of the test data.
Secondly, the insulation distance between the iron wire and the wall of the elbow-shaped casing is not enough. Simply installing an insulating sleeve on the iron wire cannot fundamentally solve the insulation problem, because due to the low insulation strength of this insulating sleeve, the leakage current during the test Larger, the safety of the trial and the accuracy of the data are still not guaranteed
[0005] Due to the existence of the above problems, when conducting handover or preventive tests on elbow cables, if the test data is unqualified, it is difficult for the test personnel to judge whether it is the problem of the cable itself or the production of the cable head, or the problem of our test tools and test methods.
In order to avoid misjudgments, testers often have to test repeatedly several times, which is time-consuming and laborious, and once misjudgments occur, it will lead to waste of materials and even delays in the construction period

Method used

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  • Special tool for elbow end cable test
  • Special tool for elbow end cable test
  • Special tool for elbow end cable test

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Such as figure 1 , Take a copper rod with a diameter of 3mm and a length of 125mm to make an extension rod, fold a right-angle elbow with a length of 12mm at the head of the extension rod, and set an M2.5×12mm external thread at the tail.

[0028] Such as image 3 , Figure 4 , Take a copper rod with a diameter of 12mm and a length of 30mm to make a clamp, set an internal thread hole of M2.5×12mm longitudinally at one end of the clamp, and set a through hole with a diameter of 8mm horizontally at the other end.

[0029] Such as Figure 5 , Tightly screw the external threaded end of the extension rod tail into the internal threaded hole of the clip.

[0030] Such as Image 6 , Figure 7 , take an insulating rod with a diameter of 35 mm, a length of 145 mm, and an insulation withstand voltage greater than 28,000 volts to make an insulating tube, process the insulating rod into an insulating tube with an inner diameter of 17 mm, and process one end of the insulating t...

Embodiment 2

[0032] Such as figure 2 , Take a copper rod with a diameter of 3mm and a length of 125mm to make an extension rod, fold a right-angle elbow with a length of 12mm at the head of the extension rod, and bend the extension rod toward the right-angle bending direction of the head at a distance of 38mm from the tail , form an angle of 30° with the centerline of the head of the extension rod, and then bend the extension rod back 30° at a distance of 30mm from the tail so that the centerline of the tail is parallel to the centerline of the head.

[0033] Such as image 3 , Figure 4 , Take a copper rod with a diameter of 12mm and a length of 30mm to make a clamp, set an inner hole with a diameter of 3mm and a depth of 12mm longitudinally at one end of the clamp, and set a through hole with a diameter of 8mm horizontally at the other end.

[0034] Such as Figure 5 , Insert the end of the extension rod into the inner hole of the clip and weld it firmly.

[0035] The making of the ...

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Abstract

The invention relates to a special tool for an elbow end cable test, which consists of a lengthened bar (1), a fastening piece (2) and an insulating tube (3); the head part of the lengthened bar (1) is provided with a quarter bend, the tail part thereof is connected with the fastening piece (2), and the insulating tube (3) is a tubular high-performance insulator; when in use, the quarter bend at the head part of the lengthened bar (1) is inserted into a round hole at the middle of an elbow end conducting rod (4) in a socket joint way, and the insulating tube (3) is sheathed outside the elbow end conducting rod (4) and inserted into a cable elbow end (5). The special tool for the elbow end cable test is portable and flexible, safe and reliable, and convenient for operation, can greatly reduce the labor intensity and operational risk of operating personnel, improves the efficiency of the elbow end cable test, and guarantees the safety of the test and the accuracy of the test data.

Description

technical field [0001] The invention belongs to the technical field of electric power transmission, and in particular relates to a special tool for elbow cable test. Background technique [0002] Due to the increasingly widespread application of box-type transformers and high-voltage branch boxes, the test of elbow cables in high-voltage branch boxes and box transformers has become an important task for high-voltage tests. Due to the special structure of the elbow cable and the lack of special test tools, the test of the elbow cable has become a new problem in the high-voltage test work. [0003] The previous test method is to connect the iron wire with the pressure wire nostril in the elbow, and then lead the conductive part out of the elbow to carry out the pressure test. Moreover, the insulation distance between the iron wire and the elbow is not enough, so we use heat shrinkable insulation The tube solves the insulation problem. Therefore, there are many shortcomings a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/12
Inventor 桑梅黄纲要常征
Owner HUAIBEI POWER SUPPLY COMPANY OF STATE GRID ANHUI ELECTRIC POWER