Abstract
The deterioration of the cement that bonds the cap, pin, and porcelain shell of the porcelain insulators can be observed by three-dimensional computed tomography (3D-CT), a non-destructive test. When porcelain insulators are used for a long duration, the size of the pores existing in the cement increase as the cement expands due to the alkali-silica reaction (ASR). It is possible to visually confirm the corrosion of caps and pins. The degree of corrosion is divided into four noticeable stages (I–IV), and deterioration of cement includes one of the four stages of corrosion. The standard time of replacement of insulator vs. continued use is presented. As a result of X-ray diffraction (XRD) analysis, Fe is oxidized to Fe2O3 at 36, 43, 54, and 70 degrees. The corrosion in cement is caused by factors including the value of pH, oxygen content, and temperature. For the caps and pins, although a zinc coating is applied to prevent the corrosion of iron, corrosion of zinc is caused by substances present in the external environment. When the zinc coating begins to corrode, the corrosion of the Fe component of the cap and pin accelerates, causing mechanical/electrical problems.
Highlights
National and international standards have been adapted for manufacturing of 154 kV insulators, specifying the electrical and mechanical performance requirements that the insulators must meet.Size, insulation, electrical and mechanical strength are important for service compatibility in various countries
This study aims to investigate the effects of aging on porcelain insulators and provide guidelines for the diagnosis of the extent of damage caused by aging within metal and cement
Even if zinc plating is used to protect a porcelain insulator that is in service for a long period of time, once the corrosion of iron starts, rapid replacement is needed to ameliorate risk [20]
Summary
National and international standards have been adapted for manufacturing of 154 kV insulators, specifying the electrical and mechanical performance requirements that the insulators must meet. Deterioration of characteristics after a long period of of use require diagnosis of aging [5]. If the mechanical characteristics deteriorate, the insulator cannot be used in the transmission tower, posing the risk of a serious accident. Thisthe is insulator cannot be used in the transmission posing the risk of a serious accident This is due due to environmental degradation caused bytower, various pollutants including water, and both electrical to environmental degradation caused by various pollutants including water, and both electrical and and mechanical stress [6]. Whenstabilize the aluminate and ferrite crystal phases react with water, rapid hydration heat occurs and and they to C4AH.
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