Small wire, big effect
There is a phenomenon of counterfeiting of wire and cable products in the market, and sometimes it is quite serious. This is mainly reflected in the fact that some unscrupulous manufacturers use shoddy work and inferior products to produce wire and cable products in order to reduce costs and pursue profits. For example, using inferior raw materials, reducing the cross-sectional area of conductors, using unqualified insulation and sheath materials, etc., all of these behaviors have seriously damaged the quality and safety of wire and cable products. The quality of the wire determines the safety of household electricity use. A small wire is related to tens of millions of families. So what is the significance of testing wires and cables?
1. Ensure safe use
Through testing, products with potential safety hazards can be discovered and eliminated in a timely manner to prevent accidents such as fires and electric shocks caused by quality problems of wires and cables.
2. Maintain market order
Crack down on counterfeit and shoddy products, protect the rights and interests of legitimate enterprises, and maintain fair competition order in the wire and cable market.
3. Promote industry progress
Through the formulation and implementation of testing standards, promote technological progress and product quality improvement in the wire and cable industry, and promote the healthy development of the industry.
The testing of wire and cable products involves multiple parameters, which are directly related to the quality and performance of the products. The main parameters tested include the following:
1. Electrical performance parameters
Conductor DC resistance: reflects the electrical transmission performance of the cable, affecting the temperature, life and safety of the cable during operation.
Insulation resistance: Test the electrical insulation performance of the cable insulation layer to ensure that there are no defects such as sand eyes and pinholes to prevent local breakdown.
Finished product voltage test and insulation core voltage test: Test the insulation performance of the cable at rated voltage.
2. Mechanical performance parameters
Tensile strength: Test the tensile strength of the insulation and sheath plastic materials. Elongation at break: Test the elongation of the material before tensile fracture.
Flexure test, bending test, load core breaking test, insulation core tearing test: ensure the flexibility and mechanical strength of the cable in use.
3. Insulation and sheath material performance parameters
Thermal weight loss, thermal shock, high temperature pressure, low temperature bending, low temperature stretching, low temperature shock: test the performance of the material under different temperature conditions.
Flame retardant performance: test the flame retardant ability of the cable when burning.
4. Marking inspection
Check whether the product model, specification, standard number, factory name and other markings on the cable packaging and surface are clear and complete.
5. Structural size parameters
Insulation and sheath thickness, thinnest thickness, and overall dimensions: These dimensions are crucial to the voltage bearing capacity and mechanical properties of the cable.
6. Measurement of capacitance and loss factor
For ultra-high voltage cables, capacitive current may become an important factor limiting its capacity and transmission distance. The measurement of capacitance and loss factor can detect deterioration phenomena such as insulation moisture, insulation layer and shielding layer shedding.
7. Insulation strength test
Including withstand voltage test and breakdown test, test the reliability of the product under working voltage, and find serious defects in insulation and shortcomings in production process.
8. Aging and stability test
Tests to maintain stable performance under stress, including thermal aging test and thermal stability test, to evaluate the stability of insulation.
So we must not underestimate a small wire, it can bring us a lot of uses. Foshan Yuejiaxin Wire and Cable Co., Ltd. is a professional manufacturer of wires and cables. The company has its own laboratory, from raw materials to finished products, and checks every level to ensure that the products that reach consumers are of good quality and low price.
