The operation experience of high-voltage equipment at home and abroad shows that pollution flashover is the main problem of external insulation of high-voltage lines (substations), which seriously threatens the safe operation of power transmission and transformation equipment. Moreover, with the improvement of the voltage level of power transmission and transformation, the pollution discharge problem of external insulation of power equipment is becoming more and more serious. In recent years, the rapid economic development of various regions and the rapid expansion of industrial parks have caused the pollution of the power grid to increase year by year.
The high-voltage equipment of the State Grid is old, and if these equipment are replaced, repeated power outages are required, which seriously affects the reliability of power supply, and the construction is difficult and the risk factor is high. Therefore, Shihua Zhongke was invited to carry out anti-fouling flash charge spraying work. Shihua Zhongke antifouling flash coating uses nanoparticle-filled RTV to improve mechanical strength by more than 2 times, melts medium-M grade aluminum hydroxide to improve the flame retardant and anti-tracking effect of the coating, and adds heat-resistant additives CE and SiC to improve the heat resistance and ultraviolet reflectivity of silicone rubber (>80%). The new PRTV has extended the service life of PRTV to a certain extent (> 10 years), and the laboratory aging test life is >> 20 years.
The spraying work of ordinary PRVT is simple to construct, but it requires a power outage of the equipment, and due to the increasing requirements for power supply reliability in recent years, the power outage of the equipment has been decreasing year by year. In particular, it supports insulator spraying, and the bus power failure is also required, which greatly increases the workload of the operator's reverse operation, and there are great potential safety hazards.
Shihua Zhongke live spraying technical team has strong professionalism, flexible operation, short construction period, excellent workmanship, no need for power outage. In October 2023, the 20kV current transformer pillar insulators of the State Grid 220kV substation were cleaned and sprayed with live electricity, and the effect was good.