Several important indicators of wire and cable quality inspection

The detection of wire and cable has always been an important link in the national standard wire and cable. The higher the quality inspection department within a wire and cable company, the better the quality of wire and cable produced by the company and the more trustworthy it is. The stricter the third-party quality inspection department is, the more favorable it is to the development of this industry.
The following are some important indicators of wire and cable, which are the most important indicator points for measuring wire and cable.
1. Measurement of the direct current resistance of the wire : The conductive wire core of the wire and cable mainly transmits electrical energy or electrical signals. The resistance of the wire is the main indicator of its electrical performance. When the AC voltage is applied, the core resistance is larger than the DC voltage due to the skin effect, but when the frequency of the eye is 50Hz, the difference between the two is very small. All of them can only be required to check whether the DC resistance or resistivity of the wire core exceeds the value specified in the standard. Through this check, certain defects in the production process can be discovered: if the wire breaks or part of the single wire breaks; the wire cross section is not Meet the standards; the length of the product is not correct.
2. Insulation resistance test: Insulation resistance is an important index reflecting the insulation properties of wire and cable products, and is closely related to the strength of the product, dielectric loss, and the gradual deterioration of the insulation material under working conditions. For communication cables, too low insulation resistance between lines will also increase loop attenuation, crosstalk between loops, and long-distance power supply leaks on conductive cores, etc. Therefore, the insulation resistance should be higher than the specified value.

3, the measurement of capacitance and loss factor : the cable plus AC voltage, there is current flowing, when the voltage amplitude and frequency is constant, the size of the capacitor current is proportional to the cable capacitance (Cx). For ultra-high voltage cables, the current of this capacitor may reach a value comparable to the rated current, which becomes an important factor limiting the cable capacity and transmission distance. Therefore, the capacitance of the cable is also one of the main electrical performance parameters of the cable. The measurement of capacitance and loss factor can reveal that the insulation is damp, the insulation layer and the shielding layer fall off, and other insulation degradation phenomena. Therefore, capacitance and TANδ are measured both in cable manufacturing and cable operation.
4. Insulation strength test: The insulation strength of wires and cables refers to the ability of insulation structures and insulation materials to withstand the effects of electric fields without breakdown. To check the quality of wire and cable products and ensure that products can operate safely, all insulation types of wire and cable are generally Insulation strength tests should be conducted. Dielectric strength test can be divided into pressure test and breakdown test. The time voltage is generally higher than the rated working voltage of the test product. The specific voltage value and withstand voltage time are stipulated in the product standards. The withstand voltage test can test the reliability of the product under the operating voltage and find the seriousness of the insulation. Defects, but also can find some shortcomings of the production process

5. Aging and stability test: The aging test is the stability test that can maintain the stability under the stress (mechanical, electrical and thermal). Heat Aging Test: A simple heat aging test is a test of the aging property of a sample under the effect of heat. The test product is placed in an environment with a certain value higher than the rated operating temperature, so that it is obtained at a higher temperature T. Shorter life.
6, thermal stability test : thermal stability test is the cable through the current heating and also withstand a certain voltage, after undergoing a certain period of heating, determine some sensitive performance parameters to assess the stability of the insulation. The insulation stability test is divided into long-term stability test or short-term accelerated aging test.
The above is a few important indicators for the quality inspection of wire and cable shared by Kexun Cable. We hope to help everyone.

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October 21, 2024