Composite insulator , and can be widely used in high voltage power lines (including electrified railway transmission lines), especially for the filthy serious area, can effectively prevent the pollution flashover accident, belong to update products. It is small, light, no need to measure zero value, run for years don't need cleaning, not only to transport and install brought great convenience, and greatly reduce the maintenance and labor intensity, and for accident overhaul and implementation of compact lines provided the good condition, there were significant economic benefit and social benefit.
As the overhead transmission and distribution line to support or suspension of the wire line equipment, the composite insulator advantages of less weight, high mechanical strength, hydrophobic strong, more excellent anti-contaminated characteristic and zero accidents, less maintenance is the acceptance of the customers and the high praise, become good performance, safety and reliability of a new generation of insulator.
China has become the world's first use of composite insulators country, 500 kV Dc lines composite insulator dosage ranked first in the world, its research and manufacturing technology has reached the international advanced level, and the operation experience aroused international attention. Silicone rubber composite insulator become prevent countries large power grid pollution flashover main measures of the accident.
High-pressure line operation of the composite insulator mainly according to rod suspension insulator, accounts for about running all kinds of composite insulators more than 90% .
There are:
1．normal suspension type composite insulator
normal suspension type composite insulator due to mandril, umbrella skirt and outer sheath, metal end, grading ring etc. Parts.
Anti -bird is a major issue of composite insulator. Through installation of anti-bird grading ring and composite anti-bird umbrella, change the measures of umbrella skirt structure, make the product the anti- bird droppings flash collaterals function improve significantly。The products in China, the operation experience and in uhv composite insulator on the application of experience shows that:obviously the anti- bird droppings flash collaterals function the bird droppings flash collaterals probability close to zero.
3. anti- icing suspension insulator
anti- icing suspension insulator is for icing and ice flash seriously affect the safe operation of the transmission line and the development of a new type of the ice to flash products, it through the optimization of normal composite insulators umbrella-type structure, effectively solved the umbrella skirt under ice cover circumstance icicles bridging problems ,to improve ice cover flash collaterals voltage. Products with reasonable structure, reliable performance, can improve the advantages of filthy icing composite insulator AC flashover voltage , to ensure overhead transmission line safe operation reliability is of great significance。
Through the Chong Qing University artificial climate chamber of artificial icing flash collaterals experimental investigation and operation actual application data record contrast analysis, the results showed that:
1), under the same conditions，anti-icing flash composite insulator the icing AC flashover voltage than regular composite insulator high about 10-20%;
2)more serious icing,anti - icing flash composite insulator AC flashover voltage than regular composite insulator increased more.
3) between adjacent big umbrella to bridge connection times increased more than seven times, from 1 hour to improve more than seven hours.
