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Power cable quality detection method

A quality inspection method and power cable technology, applied in the direction of testing dielectric strength, etc., can solve the problems of high degree of freedom of detection means, inflow of power lines, and difficulty in unifying standards, so as to improve internal management level, complete detection coverage, and operation The effect of step specification

Inactive Publication Date: 2016-06-08
STATE GRID CORP OF CHINA +1
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AI Technical Summary

Problems solved by technology

[0002] At present, in the process of power grid construction, general industrial and mining enterprises or civil power supply, the quality of power cables is an important factor directly related to the quality and safety of power supply, so whether it is a power cable manufacturer or a power cable user, all There are strict requirements on the quality of power cables. In practical applications, due to the influence of various factors such as raw materials, production equipment and personnel, the performance parameters of cables produced in the same batch often exist. Therefore, it is necessary to carry out strict quality inspection for each batch of power cables produced or newly purchased and used. However, the current quality inspection of power cables mainly depends on the manufacturer through large-scale equipment. Detection, the detection cost is high, and the detection method is relatively single and fixed, which cannot effectively cover all aspects of the parameters of the cable. The user's detection of cables and cables mainly stays in the simple detection of the diameter of the cable core and whether there is an open circuit or short circuit, and cannot effectively detect the main parameters of the cable flexibly and effectively, resulting in a large number of low-quality power lines flowing into In the power supply grid, the safety of power supply is seriously threatened. At the same time, due to the illegal operation, dereliction of duty or work mistakes of individual personnel, the probability of inferior cables being mixed into the grid is further increased. Therefore, it is necessary to develop a new, A convenient method for quality inspection of cables

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment 1: a kind of power cable quality detection method, comprises the following steps:

[0020] The first step is sample selection. Randomly select 6 cables from the same batch of production cables as the cables to be tested, and randomly intercept 5 detection sections from each cable to be tested, a total of 30 detection sections, and the length of the detection section is 10 centimeters, and in the detection section cut off from the same cable, the insulation layer is reserved for a section, and the rest only retains the cable core conductor;

[0021] The second step is the resistivity detection. The resistivity of the 24 cable core conductors that have been stripped off the insulation layer is tested using the resistivity detector in turn, and the detected resistivity is compared with the national standard, and then according to good, qualified Classify and summarize the unqualified and unqualified, and count the numbers of each group, and mark on the conductor...

Embodiment 2

[0027] Embodiment 2: a kind of power cable quality detection method, comprises the following steps:

[0028] The first step is sample selection, randomly select 10 cables from the same batch of production as the cables to be tested, and randomly intercept 5 detection sections on each cable to be tested, a total of 50 detection sections, and the length of the detection section is 15 centimeters, and in the detection section cut off from the same cable, the insulation layer is reserved for a section, and the rest only retains the cable core conductor;

[0029] The second step is the resistivity detection. The resistivity of the 40 cable core conductors that have been peeled off the insulation layer is sequentially detected by the resistivity detector, and the detected resistivity is compared with the national standard, and then according to good, qualified Classify and summarize the unqualified and unqualified, and count the numbers of each group, and mark on the conductor at th...

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Abstract

The invention discloses a power cable quality detection method comprising the following seven steps: sampling, resistivity detection, conductor strength detection, insulation detection, cable overall strength measurement, cable thermal resistance and fire resistance measurement, and percent-of-pass measurement. The method is characterized by standardized steps, easy implementation, easy mastery, full detection coverage and high accuracy. Through the method, the quality of newly produced or purchased power cables can be conveniently and comprehensively evaluated, which, on one hand, prevents inferior power lines from being mixed into a power transmission and transformation grid to threaten safe operation of the grid, and on the other hand, helps power cable production and utilization enterprises to improve the level of internal management and reduce quality decrease of power cables due to human factors.

Description

technical field [0001] The invention relates to a power cable quality detection method, which belongs to the technical field of power cable detection. Background technique [0002] At present, in the process of power grid construction, general industrial and mining enterprises or civil power supply, the quality of power cables is an important factor directly related to the quality and safety of power supply, so whether it is a power cable manufacturer or a power cable user, all There are strict requirements on the quality of power cables. In practical applications, due to the influence of various factors such as raw materials, production equipment and personnel, the performance parameters of cables produced in the same batch often exist. Therefore, it is necessary to carry out strict quality inspection for each batch of power cables produced or newly purchased and used. However, the current quality inspection of power cables mainly depends on the manufacturer through large-s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/12
Inventor 李玉峰张立志薛建政
Owner STATE GRID CORP OF CHINA
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