A cable core quality testing method and device thereof

Abstract

The invention discloses a method and a device for detecting the quality of a cable core. The method includes: injecting a first gas into the core of the cable to be tested, and when the gas sensor detects that the detection value of the first gas is greater than or equal to the first preset When the threshold is reached, the gas pump is controlled to close, and the first inflation time is obtained; the gas collection device is turned on, and the second gas is injected into the core of the cable to be tested, and the first inflation time is reached at the inflation time or the gas sensor detects the gas When the detection value reaches the preset condition, control the gas pump to close; close the gas collection device, calculate the volume of the first gas collected by the gas collection device, and calculate according to the volume of the first gas and the single wire area of ​​the cable core to be tested. Equivalent single-wire length: According to the comparison result between the equivalent single-wire length and the actual length of the cable to be tested, it can be judged whether there is a broken strand in the cable to be tested. The invention can realize high-efficiency and accurate non-destructive detection of cable core broken strands.

Description

technical field [0001] The invention relates to the technical field of cable detection, in particular to a cable core quality detection method and device thereof. Background technique [0002] Cable is an important equipment for power transmission and transformation in the power system, and it plays an indispensable role in the safety of power load and reliable power transmission. The main materials of cable core conductors are copper and aluminum. Due to the rising prices of copper and aluminum metals in recent years, cable suppliers have a strong incentive to reduce the amount of metal used in cable conductors, resulting in cable breakage. At present, it has been found that the cable has broken strands, that is, the number of conductor lines at both ends of the cable is inconsistent with the number of conductor lines in the middle of the cable. Obviously, the conductor cross-sectional area at the broken strand position is smaller, resulting in higher resistance. Since th...

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Problems solved by technology

However, this method cannot detect the problem of broken strands in the middle of the cable

Sampling the ends of cables with broken strands in the middle section can often still pass the test. Such problems will cause the DC resistance to exceed the standard after the cable is laid. The long-term heating effect will lead to accelerated aging of the insulation, which will affect the life of the cable and cause hidden dangers to equipment safety.

Although the method of intercepting the middle section of the cable may be able to find the direct performance of broken strands, this method has caused damage to the cable, directly affects the use of the project, causes waste and also affects the progress of the construction period; the selection of the cut-off position depends on manual judgment. If there is no broken strand at the truncation position, it is necessary to re-select the position to truncate again, which is highly dependent on human subjectivity and has a low accuracy rate; the middle section of the truncation cable needs to be pulled and wound by special equipment for the cable, which requires equipment and labor higher

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