Six test indicators of electronic wire quality

The quality inspection of electronic wires is very important, because if the quality of electronic wiring harness is unqualified, it will affect the overall performance of the equipment or lead to defective problems. Therefore, electronic wires will be subject to specified quality inspection methods. The following is Huichengyuan wiring harness engineers. Explain the six major testing indicators of electronic wire quality.

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1. DC resistance test of electronic wire: The conductive core of electronic wire mainly transmits electric energy or electrical signals, and the resistance of wire is the main index of its electrical performance. When AC voltage acts, the resistance of the core is larger than that of DC voltage due to skin effect, but the difference between them is very small when the electrical frequency is 50HZ. Now the standard stipulates that it can only detect whether the DC resistance or resistivity of the core exceeds the value specified in the standard. Through this inspection, some defects in the production process can be found. II. Insulation resistance test of electronic wires: Insulation resistance is an important index reflecting the insulation characteristics of electronic wires, which is closely related to the electrical strength, dielectric loss and gradual deterioration of insulating materials under working conditions of the product. For communication wires, too low insulation resistance between wires will also increase loop attenuation, crosstalk between circuits and long-distance power supply leakage on the conductive core. Therefore, it is required that the insulation resistance should be higher than the specified value. III. Numerical test of capacitance and loss of electronic wire: Electronic wire flows through AC voltage. When the amplitude and frequency of voltage are constant, the capacitor current is proportional to the capacitance of the wire. For ultra-high voltage wire, the current of this capacitor may reach a value comparable to the rated current, which becomes an important factor limiting the capacity and transmission distance of the wire. Therefore, the capacitance of electronic wires is also one of the main electrical performance parameters of wires. Through the measurement of capacitance and loss factor, we can find various insulation deterioration phenomena such as insulation moisture, insulation layer and shielding layer falling off, etc. Therefore, no matter in wire manufacturing or wire operation, capacitance and TANδ are measured. IV. Insulation strength test of electronic wires: The insulation strength of electronic wires refers to the ability of insulation structures and insulation materials to withstand the action of electric fields without breakdown damage. In order to check the quality of wire products and ensure the safe operation of products, all insulation types of wires are generally subject to insulation strength test, which can be divided into withstand voltage test and breakdown test. The voltage at time is generally higher than the rated working voltage of the test sample. The specific voltage value and withstand voltage time are specified in the product standard. Through the withstand voltage test, the reliability of the product running under the working voltage can be tested and serious defects in insulation can be found. Defects, some shortcomings in the production process can also be found. 5. Aging and stability test of electronic wires: The aging test of electronic wires is a stability test of whether it can maintain stable performance under the action of stress (mechanical, electrical, thermal). The thermal aging test is to test the aging characteristics of the wire test product under the action of heat. The test product is placed in an environment higher than the rated working temperature and with a certain temperature value, so that the service life of the electronic wire can be determined at a higher temperature. VI. Thermal stability test of electronic wire: Thermal stability test is that the electronic wire is heated by current and bears a certain voltage. After a certain period of heating, some sensitive performance parameters are measured to evaluate the stability of insulation. Insulation stability The test is divided into two types: long-term stability test or short-term accelerated aging test.

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