With the rapid development of China's economy, the cable industry has also achieved tremendous development. There are many types of cables depending on the performance of the cable used. There are more than 100 kinds of cables such as computer cables, flame-retardant cables, and control cables. In the past few decades, the productivity of the cable manufacturing industry in China has made the world look impressive. In China's electric power industry, rail transit industry, data communications industry, automobile industry and mines, the scale of the industry continues to expand, the demand for wire and cable is also rapidly growing, the cable industry in the future development will have a lot of space. When the cable is in use, some malfunctions may occur, such as breakdown of the cable, damage to the cable conductor, and failure of the core. The conductor of the flame-retardant cable has a small area in the cross-section and may be broken during the extrusion process. So how to check the flame-retardant cable break it? A: The method of energizing the capacitor Some cable plants in this area usually use the capacitance comparison method to find the approximate location of a broken wire. Using continuous power to accurately break the cable, the efficiency of this method is very low. It usually takes about one and a half hours to find a break point. In this method, it is almost impossible for a flame-retardant cable whose shielding, armoring, and jacketing processes have been completed to find a broken core, and if it is not properly made, the flame-retardant cable will be scrapped. This method is basically no longer needed. Two: The combination of capacitance method and induction method: This method is used to break the core of the core, which requires the core of the core is not covered with metal and there is no extrusion sheath. In the search, first use the capacitor to find the approximate position of the cable break, and then use the inductive voltage method to accurately find the break point. This method is very simple and quick, and is the most used method at present. The inductive voltage method is to connect an AC voltage of 650V to one end of the broken core of the cable, and the other end and other cores are grounded, and then use a sensor pen that can send an optical signal to perform the test. When the sensor pen slides off from the broken core during the test, The signal will change so that you can find exactly where the cable breaks. Three: The combination of constant current source and bridge method This method is used to complete the cable or core of the covered metal layer. The method of using search is to burn and break down the insulation at the broken core of the flame-retardant cable with a constant current source, and then use the bridge fault locator to accurately locate the fault point, which is also a frequently used method.
Description:
TOP formaldehyde removal material is successfully developed by Shenzhen China Textile Filters R&D center and Tsinghua University research institute of new material. Through the national scientific and technological achievements identified : This technology is advanced, energy conservation and environmental friendly, which has reached the domestic industry leading level, some achievements reached the international advanced level.
TOP, which is [Trapping Oxidation Particles". It has the performance of physical and chemical double adsorption nanometer catalytic oxidation decomposition of formaldehyde at the normal temperature, no secondary pollution. After testing of the Shanghai environmental protection and product quality supervision and inspection station, formaldehyde purification efficiency reached 98% in one hour, much better than the common coal and coconut shell activated carbon. It still has super purification effect even under the low concentration
Features:
1. Normal temperature catalytic oxidation mechanism, formaldehyde degradation to carbon dioxide and water, no harmful by-products such as formic acid and carbon monoxide.Long service life.
2. Nanoscale catalyst + nanoscale porous adsorption carrier, which can contact withformaldehyde fully, ultra high formaldehyde adsorption efficiency, catalytic degradation rate.
Formaldehyde Removal Filter,Removal Formaldehyde Filter,Clean Rooms Air Filter,Portable Air Purifier Shenzhen China Textile Filters , https://www.ctfiltech.com