Study On Temperature Coatings For Thermal System Fault Detection In Power System

As a pillar industry of the national economy,the power industry plays an important role in the production activities of all walks of life.In the power transmission and distribution system,the power line has the characteristics of wide coverage,long distance,and exposure to the outdoor.The power equipment has many types,large amount of distribution,and wide use range.Transmission lines and power equipment often cause a large amount of heat due to faults,which causes the temperature of the equipment to rise.For example,after a lightning strike accident involving 35%of the transmission and distribution line accidents,the arc photoelectric energy is converted into heat energy,causing the channel temperature to rise;the electrical equipment is 24 days.Hours of operation,various fever abnormalities are also very common.If you do not check the thermal barriers in time,it may cause an accident,causing incalculable losses.If you find the fault point one second earlier,you can save a lot of property and even life.At present,the infrared diagnostic technology used is the most accurate method for detecting overheat faults,but there are also many defects such as expensive equipment,strict environmental adaptation requirements,and requirements for the quality of users.Therefore,it is very necessary to find a new way to troubleshoot overheat faults that is simple,fast,convenient and accurate.As a temperature-sensitive functional thermochromic coating,it responds to changes in temperature with a color change.The thermochromic coating is applied to the surface of the power facility,and the maintenance personnel can directly observe the color change of the paint by visually observing the position of the power system failure,thereby accurately checking,saving cost and time.According to the background of different types of thermal faults in power systems,this study developed three irreversible temperature-sensitive coatings for rapid response identification of lightning strike points,temperature parameter distribution of fault temperature field distribution,and common equipment heating abnormality monitoring:800°C,5s Ultra-fast response color-changing high-temperature single-color temperature-sensitive paint;constant temperature 5s,300°C-900°C range of multi-color high-temperature multi-color temperature-sensitive paint;constant temperature 5min,60°C-200°C range of multi-color medium temperature multi-color temperature paint.The three coatings prepared have good physical and mechanical properties and meet the requirements of national standards for coatings.The color change is obvious.The high-temperature single-color temperature-sensitive paint with cobalt oxalate and tungsten oxide as the main color-changing material shows obvious color change from pink to brown under the experimental conditions;the high temperature is more than yttrium oxide,crystal violet and cobalt sulfate.The color-changing paint has 7 color-changing points,and the color changes of dark purple,light purple,grayish white,yellow-brown,dark brown,black,and dark coffee color appear from 300°C to 900°C in sequence;the medium temperature and multi-color change with sulfate as the mixed color-changing pigment The paint showed a gradual change from blue to green and then yellow in the temperature range.Through the characterization of instruments and equipment,the discoloration mechanism of the pigment system at the temperature node of800°C was studied.The discoloration mechanism of the single-color pigment system was that the purple-violet cobalt oxalate reacted at high temperature to form brown-black cobalt oxide Co₃O₄ and CoO.The color of the yellow-green tungsten oxide without color change is superimposed to obtain the transition between the initial state and the final color;the mechanism of the color change of the multi-color pigment system at 800°C is that the cobalt sulfate is partially thermally oxidized to cobalt oxide CoO,cobalt oxide and The high-temperature solid phase synthesis of cerium oxide produces a variety of cobalt-oxygen ternary oxides.The difference between the reactants and the product causes purple and black color changes before and after the calcined coating.In addition,a temperature identification algorithm is proposed for the color temperature relationship of multi-color paints to accelerate the automatic process of online fault detection of thermal faults.In addition,after collecting sufficient fault temperature parameters through the color of the temperature paint,it can provide research and development of new materials for power equipment.Reference to temperature specifications.