Wire and cable testing is an important link in the national standard wire and cable, a wire and cable enterprise internal quality inspection department is higher, the quality of the wire and cable produced by the enterprise is better, the more trustworthy. The following introduces several important indicators of wire and cable, which are key indicators of wire and cable.

1, the measurement of conductor DC resistance: the conductive wire core of the wire and cable mainly transmits electrical energy or electrical signals. The resistance of the conductor is the main indicator of its electrical performance. The core resistance under the action of AC voltage is larger than that under the action of DC voltage due to skin effect and adjacent effect surface, but the difference between the two is very small when the electrical frequency is 50Hz. Now the standard only requires the detection of whether the DC resistance or resistivity of the core exceeds the specified value in the standard. Through this inspection, some defects in the production process can be found, such as wire breakage or partial single wire breakage, wire cross sections do not meet the standard, and the length of the product is incorrect.

2, insulation resistance test:

The insulation resistance type reflects the important indicators of the insulation characteristics of wire and cable products, and has a close relationship with the electrical strength of the product, medium loss, and the gradual deterioration of the insulation material in the working state. For communication cables, too low insulation resistance between wires will also increase loop attenuation, cross-talk between loops and long-distance power supply leakage on the conductive wire core, so the insulation resistance should be higher than the specified value.

3. Measurement of capacitance and loss factor:

When the amplitude and frequency of the voltage are certain, the size of the capacitive current of the wire and cable price is proportional to the capacitance of the cable (CX). For ultra-high voltage cables, the current of this capacitor may reach a value that can be compared with the rated current, which becomes an important factor limiting the cable capacity and transmission distance.

4, insulation strength test:

The insulation strength of wire and cable refers to the ability of insulating structure and insulating material to withstand the electric field without breakdown and damage, in order to check the quality of wire and cable products and ensure the safe operation of products, all types of insulation wire and cable are generally required to carry out insulation strength tests. Insulation strength test can be divided into voltage test and breakdown test.

5. Aging and stability test:

Aging test is the stability test of whether the performance can be maintained under the action of stress (mechanical, electrical, thermal). Thermal aging test: A simple thermal aging test is to test the characteristics of the aging of the test product under the action of heat, put the test product in an environment higher than the rated operating temperature temperature of a certain value, so that at a higher temperature T, a shorter life.

6, heat stability test:

Thermal stability test is the wire and cable through the current heating at the same time also withstand a certain voltage, after a certain period of heating, determine some sensitive performance parameters to assess the stability of insulation. Insulation stability test is divided into long-term stability test or short-term accelerated aging test.

Qingdao Tianxing Cable Co., Ltd. focuses on the production of customized wire and cable manufacturers, main: fire wire and cable, power cable, control cable and other products, exported to more than 40 countries and regions around the world, the annual production capacity of 1 billion yuan. 6000 square meters of storage, standing hundreds of millions of inventory, order demand for rapid distribution and delivery, large prices more favorable. Hotline: 16678668098