Performance comparison of glass insulators and porcelain insulators

The electrical properties and mechanical energy of porcelain insulators mainly used in China's high-voltage transmission and distribution lines have reached the standards required by the national power grid construction, but in some specific circuits, the performance of tempered glass insulators is far greater than that of porcelain insulators. performance.

Porcelain insulators are insulators of breakdown type. Under the long-term mechanical action and natural corrosion, the properties of the materials will be inferior, especially after the lightning and flashing, the porcelain insulators deteriorate. It may explode and endanger the safety of the circuit.

Zero value self-explosion

The tempered glass insulator has the performance characteristic of zero-value self-explosion, which is a characteristic that the sub-insulator does not have. The skirt of the tempered glass insulator will still have sufficient mechanical strength to withstand the mechanical action of the wire after self-explosion, and the wire will not be used to bring up the insulator string. Moreover, the zero-value self-explosive tempered glass insulator brings convenience to maintenance. The tempered glass insulators after zero-value self-explosion can be found with the naked eye, and no maintenance workers are required to frequently check the towers one by one. This brings great convenience to the overhaul.

The smooth glass insulator can withstand a mechanical strength of 80-120 MPa, and its mechanical properties should be twice as high as that of ceramic insulators. After the tempered glass insulator is damaged by lightning strikes, the smooth glass body still has insulation properties, and the tempered glass The steel structure inside the insulator still has sufficient mechanical properties to ensure the safety of the power line. This is an advantage that ceramic insulators cannot.

The tempered glass has a high surface strength and is superior to ceramic insulators in electrical properties such as arc resistance. Thus, various properties of tempered glass insulators are not available for ceramic insulators.