The wires and cables are an indispensable power transmission medium indispensable in the electrical industry. Where there is electricity, there will be electric wires and cables. Different electricity specifications have different requirements for the performance of the wires and cables.Detecting indicators to buy more high -quality wires?What should the wires pay attention to when installing?Do I still need to maintain the wire after installation?Regarding these issues, I think everyone is not only confused. Today I will bring you this guide guide about wires.
Cable cable quality detection index
1. Measurement of DC resistance:
The wire -conducting wire core of the wires and cables mainly transmits electrical energy or electrical signals.The wire resistance of the wire is the main indicator of its electrical performance. When the AC voltage effect, the core resistance of the wire is larger than the DC voltage. However, when the frequency is 50Hz, the two are small.It can only be required to detect whether the DC resistance of the wire core or the resistivity exceeds the values ??specified in the standard. Through this inspection, some defects in the production process can be found, such as the wire fracture of the wire or some of the single -wire breaks, and the wire section of the wire does not meet the standard standardsThe length of the product is incorrect.
2. Test of insulation resistance:
Insulation resistance -type important indicators reflect the insulation characteristics of wires and cable products, which are closely related to the products electrical resistance, medium loss, and the gradual degradation of insulation materials in the working state.For communication cables, too low insulation resistance between wires will also increase the degradation of the circuit, the skewers between the circuit, and the long -range power supply leakage on the wire -conducting core. Therefore, the insulation resistance should be higher than the specified value.
3. Measurement of capacitance and loss factor:
Cable plus AC voltage, there is a current flow. When the amplitude and frequency of the voltage are certain, the size of the capacitor current is proportional to the capacitance (CX) of the cable.For ultra -high -voltage cables, the current of this capacitor may reach the value that can be compared with the rated current, becoming an important factor restricting 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 capacitors and loss factor, various insulation and inferiority phenomena such as insulation, insulation layers and shielding layers fall off, so there is a measurement of capacitors and TANΔ in the cable manufacturing or cable operation.
4. Insulation intensity test:
The insulation strength of the wire and cable refers to the ability to withstand the effect of the insulation structure and the insulation material to bear the effect of the electric field without breakdown and damage. In order to check the quality of the wire and cable product and ensure the product can operate safely, all insulating types of wires and cables generally need to conduct insulation intensity tests.EssenceThe insulation strength test can be divided into resistance test and breakdown test.The voltage of time is generally higher than the rated operating voltage of the test product. The specific voltage value and voltage resistance time. The product standards are stipulated that the product can test the reliability of the product under the working voltage and the serious discovery of the insulation in the insulation.Deadiaries can also be found some shortcomings of the production process.
5, aging and stability test:
The aging test is whether the stability test can be maintained under the action of stress (mechanical, electricity, heat).
Heating Test: Simple thermal aging test is to test the aging characteristics of the test product under the action of heat. Put the test product in an environment that is higher than the rated work temperature and temperature.Short life.
6. Hot stability test:
The thermal stability test is that the cable is heated by the current while also undergoing a certain voltage. After experiencing a certain period of heating, it is determined that some sensitive performance parameters are determined to evaluate the stability of the insulation.Insulation stability tests are divided into two types: long -term stability test or short -term accelerated aging test.
What should I pay attention to when installing the wire
1. The correct connection method
In the process of laying a wire, try to avoid connections as much as possible, because the connection is often the most prone to a large resistance, resulting in the heat of the wires. If the connector cannot be avoided, then the external insulating adhesive cloth is tight.
2. Choose a reasonable installation form
You can choose two different forms: bright and dark installation in the installation of indoor wires. The light -fitting is laid along the wall and the surface of the ceiling. Pay attention to the familys self -installation.The wire is fixed.Dark installation refers to the wires that are laid in the wall or the ceiling. For safety reasons, the dark installation must be operated by professional personnel.
3. Use ground wire correctly
For electrical appliances that need to use three -phase plugs such as washing machines and refrigerators, reliable ground wires must be installed.
How to maintain the wire
1. Avoid moisture, heating, corroding or injury, try to make these unhealthy environments in principle when using the wires.
2. After using the wire for a period of time, check the wires regularly. If the problem is found, it should be replaced within the first time.
3. Do not let the wires overload to avoid accidents.
4. Check out the use of electrical and lines at home from time to time, find problems, and timely maintain and repair.
5. For some lines that are installed in the old -fashioned building line or disappointed for a long time, you must check whether the wires are aging. If the problem is found, the electrician should be asked to repair immediately.
6. Pay special attention to the routes that are easily soaked in floods. If necessary, you can ask the electrician to migrate the line and protect it with elevated and moisture -proof measures.
7. If the power is stopped, the power should be cut off immediately. Please check the cause of the electrician and send a special person to take care of it.

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