Cable End Leak Testing with Parasitic Cavity Pressure Equalization
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Solution Overview
Problem
The accuracy of leak tests on cables is limited due to parasitic cavities formed by stranded conductors, which allow test medium to escape, distorting the test results and making it difficult to detect leaks at connectors and cable ends.
Innovation Solution
A method and device that synchronizes the leak test by applying the same or different pressures to all cable ends simultaneously, using a control unit to manage pressure settings and sensors to measure leakage, ensuring all ends are tested simultaneously and accurately.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a traditional leak test is performed on a cable with stranded conductor, then the test can be conducted, but the accuracy is limited due to gaps between individual strands allowing test medium to escape
Solution Approach 1:
The invention applies preliminary pressurization to the parasitic cavity before the actual leak test to equalize pressure and prevent test medium from escaping through the cavity. By pre-pressurizing the cavity with the same test medium at the same pressure, the pressure gradient that would cause false leakage is eliminated, allowing accurate detection of actual leaks at connectors and cable ends.
2Reliability
If pressure is applied to test cable ends, then leak detection is enabled, but test medium escapes through parasitic cavities distorting results
Solution Approach 1:
The invention performs a preliminary pressurization step where the parasitic cavity is pressurized with test medium at the same pressure as the cable ends before the actual leak test begins. This preliminary action ensures that when pressure is subsequently applied during the leak test, no pressure gradient exists to drive test medium through the cavity, thereby preventing result distortion and enabling reliable leak detection.
3Productivity
If conventional leak testing is performed, then the process can be completed, but additional leakage through parasitic cavities makes it difficult to detect actual leaks
Solution Approach 1:
The invention introduces a preliminary pressurization step that counteracts the harmful effect of parasitic cavity leakage before the actual leak test. By equalizing pressure in the cavity with the cable ends using the same test medium, the method eliminates the pressure-driven false leakage path, making actual leaks at connectors and cable ends detectable without interference.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances the accuracy and speed of leak testing by minimizing additional leakage through parasitic cavities, allowing for precise detection of leaks and improving the quality assessment of cable seals.
Implementation Method 1
a pressure can be set in each end piece that is inserted into one of the sealing cages using a test medium, in particular air
Data Source
Figure 1~2
Figure 3~4
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AI summary
A method is described for leak testing a cable (2) using a test device (4), wherein the cable (2) has at least two end pieces (6), a sheath (8) and a conductor (10), the sheath (8) and the conductor (10) extending between the two end pieces (6), the sheath (8) enclosing an interior space (12) in which the conductor (10) is arranged, the cable (2) having a parasitic cavity (14) within the interior space (12) through which a fluidic connection is formed between the end pieces (6), the test device (4) having a sealing cage (16) for each end piece (6) in which a pressure can be set using a test medium (M), each end piece (6) being inserted into one of the sealing cages (16) so that the parasitic cavity (14) is fluidically connected to the sealing cages (16).wherein a leak test is carried out on at least one of the end pieces (6) using the test medium (M), while a respective pressure is set in all sealing cages (16). Furthermore, a corresponding test device (4) is specified.