Insulator function of post insulator

    One end of the high-voltage wire connecting tower hangs a lot of disk like insulators, which are usually made of glass or ceramic, which is made of glass or ceramic. In order to prevent dust and other dirt attached on the surface of the insulator, the formation pathway is the voltage on both ends of the insulator breakdown, the creepage. Therefore, increasing the distance to the surface, creepage distance, along an insulating surface discharge distance the leakage distance call creepage distance. Creepage distance surface = distance / maximum voltage system. According to the pollution process in varying degrees, heavy pollution area generally use the creepage distance is 31 mm / / kV. Zero value insulator refers to the potential distribution of insulator is close to zero or equal to zero insulator in operation. Zero or low value insulator effects: line conductor insulation dependent on insulator strings, due to manufacturing defects or outside, insulator insulation will be deterioration, when the insulation resistance is reduced or zero said is low or zero value insulator. We have to line were detected, zero or low value of the proportion of insulator actually up to 9%. This is another main reason for the company the lightning trip out rate. The insulator is smooth, can reduce the effect of capacitance between the wires, in order to reduce the loss of current.

     1, a supporting insulator are in line with GB8287.1 the high-voltage pillar porcelain insulator technical conditions "and GB12744. The dirt proof outdoor bar shaped pillar porcelain insulator, the provisions of, is also in line with international standards IEC168 the nominal voltage above 1000 Volts system users and outdoor ceramic or glass pillar insulator test" and IEC publication 815 the insulator under polluted conditions selection guide "provisions.

     2, the earthquake resistance level is high.

     Rated voltage 252kV, 550kV insulator, in the Beijing water conservancy and Hydropower Research Institute of the earthquake intensity of 9 anti seismic performance test, the results are in good condition.

     3, high mechanical strength of insulators, small dispersion, safe and reliable operation.

     4, good resistance to pollution.

     The anti fouling performance of insulators is mainly determined by the structure of the product and the shape of the umbrella skirt. A lot of work has been done in this area. Through the design optimization, artificial pollution test and natural pollution test, finally determine the size of the umbrella and the umbrella under the umbrella of the umbrella skirt. Developed by the umbrella skirt is rated voltage is 126kV, 252kV bending failure load of not less than 12 kV, and the specific creepage distance of 25mm/kV insulator, in 0.12mg/ cm 2 equivalent salt density, can tolerate long-term maximum operating voltage, namely insulator III climb electrical distance, tolerance class IV ESDD contamination. Rated voltage of 550kV for the specific creepage distance of 25mm/kV insulator in 0.06mg/ 2 cm ESDD under long-term operation. Insulator pollution level in the lead in the country, it is resistant to the equivalent salt density higher than the same distance, the same size of the umbrella skirt similar products 1/3. The northeast electric power test and Research Institute of insulation of artificial pollution withstand voltage test results show that the creepage distance 31mm/kV insulator withstand the highest value of salt density for 0.25mg/ cm 2.

     5, insulator low temperature mechanical performance is good.

In order to test the low temperature mechanical properties of the products, the changes of the outdoor winter temperature in the water section of the Songliao water conservancy commission were simulated, and the freezing test of the ZSW1-110/4 insulator was carried out. After several temperature cycles, the test is done at low temperature. The test results show that the flexural failure strength of the insulator at -40 C is no significant change compared with that at room temperature.

     6, radio interference is low.

     550kV rated voltage of the insulator, at 1.1 times the maximum operating phase voltage, the radio interference is not more than 500 mu V, sunny night without visible corona, visible corona voltage up to 450kV.