多变色不可逆示温材料制备及其智能电网应用

Under the background of the emergence of intelligent society, the intelligent investigation and monitoring of overheating fault in power system has become an urgent problem to be solved in the future smart power grid. In this paper, a kind of multi-color temperature indicating material is prepared, which can quickly locate and record the temperature of overheat fault points such as lightning strike and short circuit by the property of multiple thermal discoloration of the material. The study confirms that this material can present seven different color changes in a wide range of temperature (300~900℃), and the color change response time is 5 s, which meets the application requirements of power system. In order to facilitate temperature acquisition, RGB values of coating colors at different temperatures were extracted by chromatic aberration meter, and standard color-temperature spatial curve was constructed. On this basis, the least square method was used to realize automatic temperature recognition. Finally, the mechanism of discoloration at 800℃ was studied. The results showed that the discoloration was mainly caused by the decomposition of cobalt sulfate and the reaction of its product with bismuth oxide.