Cable core quality detection method and device

Abstract

The invention discloses a cable core quality detection method and device. The method comprises the steps of: injecting first gas into a cable core of a to-be-detected cable, controlling a gas pump to be closed when a gas sensor detects that a first gas detection value is greater than or equal to a first preset threshold, and obtaining first inflation time; starting a gas collecting device, injecting second gas into the cable core of the to-be-detected cable, and controlling the gas pump to be closed when the gas charging time reaches a first gas charging time or the gas sensor detects that a gas detection value reaches a preset condition; closing the gas collection device, calculating the volume of the first gas collected by the gas collection device, and calculating the equivalent single line length according to the volume of the first gas and the single line area of the cable core of the to-be-detected cable; and according to a comparison result between the equivalent single line length and the actual length of the to-be-detected cable, judging whether the to-be-detected cable has core strand breakage. According to the invention, nondestructive testing can be efficiently and accurately carried out on the strand breaking condition of a cable core.

Description

technical field [0001] The invention relates to the technical field of cable detection, in particular to a cable core quality detection method and a device thereof. Background technique [0002] Cables are important equipment for power transmission and transformation in power systems, and play an indispensable role in the safety of power loads and reliable transmission of power. 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 breakages. At present, it has been found that some cables have broken strands in China, that is, the number of conductor single wires at both ends of the cable is inconsistent with the number of conductor single wires in the middle of the cable. Obviously, the cross-sectional area of ​​the conductor at the broken strand position is smaller, resulti...

AI Technical Summary

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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