Cables are products used to transmit electric energy, information and realize electromagnetic energy conversion. When purchasing cables, you need to consider whether the quality of the cables can meet your needs. The following are several important indicators that need to be paid attention to when purchasing wires and cables, which can be used to measure the quality and performance of wires and cables. Help you make better choices.
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1. Measurement of DC resistance of wire:
The conductive core of the wire and cable mainly transmits electric energy or electric signal. The resistance of the wire is the main indicator of its electrical performance. When the AC voltage is applied, the core resistance is larger due to the skin effect and the adjacent effect surface than when the DC voltage is applied, but when the electrical frequency is 50Hz, the difference between the two is very small. The inspection can find defects such as wire breakage or part of single wire breakage, wire cross section does not meet the standard, and product length is incorrect.
2. Test of insulation resistance:
Insulation resistance is an important indicator reflecting the insulation characteristics of wire and cable products, and is closely related to the product's electrical strength, dielectric loss, and the gradual deterioration of insulating materials under working conditions. Generally, the insulation resistance is required to be higher than the specified value.
3. Measurement of capacitance and loss factor:
In ultra-high voltage cables, once the capacitor current reaches a value comparable to the rated current, it will become 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. Through the measurement of capacitance and dissipation factor, various insulation deterioration phenomena such as insulation moisture, insulation layer and shielding layer fall off can be found.
4. Dielectric strength test:
Insulation strength refers to the ability of insulation structure and insulation materials to withstand electric field without breakdown. In order to ensure the safe operation of products, all insulation types of wires and cables are generally subjected to insulation strength tests. Through the test, the reliability of the product running under the working voltage can be tested and serious defects in the insulation can be found, and some shortcomings of the production process can also be found.
5. Thermal aging and thermal stability test:
The aging test is a stability test to maintain stable performance under stress (mechanical, electrical, thermal). Put the test product in an environment with a certain temperature higher than the rated working temperature, and observe its performance changes at a higher temperature T; the thermal stability test is that the cable is heated by current while also withstanding a certain voltage. After a certain period of heating, some sensitive performance parameters are measured to evaluate the stability of the insulation.
High-quality cables that pass the test can bring you a better experience. Therefore, you need a high-quality cable manufacturer to solve the problem for you. TXGA professional cable manufacturer, free customization, punctual delivery, online selection and proofing, welcome online consultation.
