Cable Cushion Layer Defect Detection Using Stressed-State Resistivity
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Solution Overview
Problem
Current volume resistivity detection methods for cable cushion layers are inadequate as they fail to accurately account for dampness, overlapping, and stress, leading to inconsistent and inaccurate detection results, particularly in the production process of power cables, where the cushion layer is exposed to air and undergoes quality deterioration.
Innovation Solution
A method and apparatus that calculates the stressed-state deformation ratio of the cushion layer by obtaining specification parameters, calculating volumes before and after deformation, and determining volume resistivity using electrode distances and currents, allowing for accurate defect detection by comparing with a preset evaluation parameter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If current volume resistivity detection methods are used on finished cushion layers, then detection can be performed, but the detection results cannot accurately reflect the real condition of the cushion layer wrapping tape in the cable due to exposure to air and environmental factors
Solution Approach 1:
The patent applies preliminary action by detecting the cushion layer wrapping tape in its original state within the cable before it is exposed to air and environmental factors during subsequent production processes. This allows the detection to reflect the real condition of the cushion layer at the time of installation, rather than after it has been exposed to air for extended periods.
Solution Approach 2:
The patent uses the cable structure itself as an intermediary environment for detection. By detecting the cushion layer while it is still wrapped within the cable (using the cable's metallic sheath and corrugated structure as part of the detection system), the measurement reflects the actual operating conditions rather than exposed environmental conditions.
2Ease of operation
If current volume resistivity detection methods are used on single-layer cushion layers, then detection is simplified, but the detection results are inconsistent for multi-layer overlapping cushion layers because inner and outer layers show different results
Solution Approach 1:
The patent merges the detection of multiple cushion layer into a single integrated measurement. By using the electrode system to measure the overall volume resistivity of the multi-layer structure together, rather than attempting to separate and measure each layer individually, the method achieves consistent and reliable detection results for the complete cushion layer assembly.
Solution Approach 2:
The patent creates a universal detection method that works for both single-layer and multi-layer cushion layer structures. The same electrode configuration and measurement procedure can be applied to detect the volume resistivity of the cushion layer regardless of whether it consists of one layer or multiple overlapping layers, eliminating the need for different detection approaches.
3Productivity
If cushion layer is exposed to air during production processes, then production can proceed, but quality deterioration occurs due to dampness and environmental exposure
Solution Approach 1:
The patent performs quality detection at an early stage in the production process, before the cushion layer is exposed to air for extended periods. By detecting the volume resistivity while the cushion layer is still in its protected state within the cable structure, the method identifies quality issues before environmental exposure causes deterioration, allowing for timely corrective action.
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
The method accurately determines the quality of the cushion layer by considering overlapping, dampness, and stress, enabling precise detection of defects in the cable's cushion layer.
Implementation Method 1
calculating volume resistivity of the cushion layer based on the voltage, the current, the electrode area, the electrode distance, and the initial electrode distance
Data Source
AI summary
The present disclosure provides a defect detection method and apparatus for a cushion layer of a cable, a device, and a storage medium. The method includes: obtaining specification parameters of a corrugated sheath of a to-be-detected cable, calculating a first volume of a cushion layer without deformation and a second volume of a deformed portion of the cushion layer when the cushion layer is deformed under stress, and calculating a stressed-state deformation ratio of the cushion layer based on the first volume and the second volume; obtaining a voltage, a current, an electrode area, an electrode distance, and an initial electrode distance of the cushion layer when the stressed-state deformation ratio is reached, and calculating volume resistivity of the cushion layer; and comparing the volume resistivity with a preset evaluation parameter to obtain a defect detection result of the cushion layer.