Cables and cables are an important part of modern communication and power systems, and the accuracy of their insulation thickness and overall dimensions is crucial for the normal operation and safety of equipment. Therefore, it is very necessary to measure the insulation thickness and external dimensions of the cable and the mechanical properties of the cable. This article will introduce the importance of insulation thickness and dimension measurements, measurement methods, and related mechanical property tests.
1. The importance of insulation thickness and dimension measurement
The insulation thickness and dimensions of the cable are the key factors affecting its electrical and mechanical properties. If the insulation thickness is insufficient, it will lead to a decrease in the insulation effect and increase the risk of electrical failure; Inaccurate dimensions may lead to a small bending radius of the cable or cable, which will cause it to be subjected to excessive stress during operation, which will affect its service life. Therefore, accurate measurement of the insulation thickness and external dimensions of cable fiber optic cables is a necessary means to ensure their performance and safety.
2. Measurement method of insulation thickness and external dimensions
1.Measuring tools: Commonly used measuring tools are calipers, micrometers, thickness gauges, etc. These tools are highly accurate and easy to operate, and are able to meet general measurement needs.
2.Measurement Steps:
1) Clean the outer surface of the cable to be measured to ensure that there are no dirt, impurities and other factors that affect the measurement accuracy;
2) Select the appropriate measuring tool and place the measuring tool in the position to be measured;
3) Follow the instructions of the measuring tool to operate and read out the measured value;
4) Take multiple measurements at the same location and take the average value to improve the measurement accuracy.
3.Precautions: During the measurement process, attention should be paid to maintaining the cleanliness and accuracy of the measuring tools to avoid the influence of human factors on the measurement results. At the same time, special measurement methods or tools may be required for specially shaped cables.
3. Mechanical property test
In order to further verify the mechanical properties of the cable, a series of tests are required. These tests include tensile tests, flexure tests, pressure tests, etc.
1.Tensile test: The tensile strength and elongation of the cable can be tested through the tensile test to evaluate its performance when subjected to tensile force. During the test, the tensile force is gradually increased, the elongation of the cable is recorded, and the tensile strength and elongation are calculated.
2.Bend test: The bend test is used to test the performance of cable fiber optic cables when subjected to bending stress. During the test, the cable is placed on the bending device, and the bending angle is gradually increased to observe whether it has cracks or fractures to evaluate its bending performance.
3.Withstand voltage test: The withstand voltage test is used to test the performance of the insulation layer of the cable when it is subjected to a certain voltage. During the test, the voltage is gradually increased to observe whether the insulation layer has breakdown or corona to evaluate its withstand voltage performance.
Through the above mechanical property test, the mechanical properties of the cable can be comprehensively evaluated, so as to provide a reliable basis for its performance in actual use. At the same time, these tests can also provide an important reference for the design, production and quality control of cables.