1. All post insulators comply with gb8287 1 the technical conditions for high voltage Post Porcelain Insulators and gb12744, pollution resistant field rod post porcelain insulators, also comply with the provisions of the international standard iec168 "test of indoor and outdoor porcelain or glass post insulators in systems with nominal voltage higher than 1000 V" and IEC publication 815 "guide for the selection of insulators under polluted conditions".
2. The insulator has high mechanical strength, low dispersion and safe and reliable operation.
3. Low temperature mechanical function of insulator is good.
In order to check the low-temperature mechanical function of the product, the freezing experiment of zsw1-110 / 4 insulator was carried out in the low-temperature laboratory of the Institute of water science of Songliao water conservancy commission, imitating the change of outdoor temperature in winter. After several temperature cycles, the test crystal is subjected to zigzag damage experiment at low temperature. The experimental results show that the zigzag damage strength of insulator at - 40 ℃ has no obvious change compared with room temperature.
4. Excellent stain resistance.
The anti pollution function of insulator mainly depends on the product structure and the shape of umbrella skirt. A lot of work has been done in this regard. Through design optimization, artificial pollution experiment optimization and natural pollution experiment optimization, the insulator umbrella skirt with alternating large and small umbrellas and ribs under the umbrella is determined. The insulators with additional voltage of 126kV and 252kV, tortuous damage load of not less than 12kV and creepage specific distance of 25mm / kV developed with the umbrella skirt can withstand high operating phase voltage for a long time under the equivalent salt density of 0.12mg/cm2, that is, the creepage distance of insulator level III and the equivalent salt density pollution of level IV. Insulators with additional voltage of 550kV and creepage specific distance of 25mm / kV can operate for a long time under the salt density of 0.06mg/cm2. The pollution resistance level of insulator is the first in China. Its equivalent salt density value is one third higher than that of similar products with the same climbing distance and equal diameter umbrella skirt.
5. High earthquake resistance level.
The additional voltage of 252kV and 550kV insulators were tested for anti earthquake function with intensity of 9 in Beijing Institute of water resources and Hydropower Research, and the test objects were intact.
6. Low radio disturbance.
The radio disturbance of insulator with additional voltage of 550kV under 1.1 times of high operating phase voltage shall not be greater than 500 μ 5. There is no visible corona at night on sunny days, and the visible corona voltage is up to 450kv.
