In the first few years of production and operation, pin insulators have found a series of advantages over porcelain insulators.
Due to the high mechanical strength of the surface layer of the glass insulator, the surface is less likely to crack. The electrical strength of glass is generally kept constant throughout the operation, and its aging process is much slower than that of porcelain. Therefore, glass insulators are mainly scrapped due to self-damage. They occur within the first year of operation, but the defects of porcelain insulators are only in operation. Years later began to discover.
The use of glass insulators can eliminate the periodical preventive test of the electrification during operation. This is because every damage to the tempered glass will cause the destruction of the insulator, and the operator can easily find it when inspecting the line. When the insulator is damaged, the glass fragments near the steel cap and the iron foot are caught, and the remaining portion of the insulator has sufficient mechanical strength to prevent the insulator string from breaking off.
The contribution of pin insulators in the society, then there is a very accurate fault location system for ceramic insulators, the following gives you details:
1. When the lightning strikes the transmission line, the inspection system can counterattack and bypass the difference;
2. Can check the insulator string flash, bird harm and other unclear flashover events;
3. It can be clearly determined whether the insulator string with the sensor installed has a flashover event.
4. The inspection results are transmitted back to the substation through wireless transmission means such as GPRS, and no signal transmission line is required;
5. Suitable for 110kV and above transmission lines of various voltage levels;
6. Suitable for porcelain insulators, composite insulators and pin insulators and other insulators, not affected by the insulator shape
One end of the high-voltage wire connection tower is hung with a lot of disk-shaped insulators, it is to increase the creepage distance, usually made of glass or ceramics, called insulators. In order to prevent dust and other pollutants from attaching on the surface of the insulator, a voltage path is formed to break through the voltage across the insulator, that is, creepage. Therefore, the surface distance is increased, that is, the creepage distance, and the distance of discharge along the insulating surface is the creepage distance. Surface distance/system maximum voltage. According to the degree of contamination, the heavy creep area generally uses a creepage of 31 mm/kV. A zero-value insulator refers to an insulator whose potential distribution across the insulator is close to zero or equal to zero during operation. The influence of zero-value or low-value insulator: The insulation of the line conductor depends on the insulator string, and the insulation performance of the insulator will be continuously degraded due to a manufacturing defect or an external influence. When the insulation resistance is reduced or zero, the insulator is called a low-value or zero-value insulator. We have tested the line, and the proportion of zero or low value insulators is as high as about 9%. This is another reason why our company's line lightning strike rate is high. The insulator is smooth and can reduce the capacitive reactance between the wires to reduce the loss of current.
1. The pillar insulators are in line with the provisions of GB8287.1 "High-pressure pillar porcelain insulator technical conditions" and GB12744, "pollution-resistant outdoor rod-shaped pillar porcelain insulators", also in line with international standards IEC168 "nominal voltage above 1000 volts system users Tests for porcelain and glass insulators for interior and exterior poles, and IEC publication 815, Guidelines for selection of insulators under soil conditions.
2. The pin insulator has high mechanical strength, small dispersion, and safe and reliable operation.
3, needle insulators have good mechanical properties at low temperature.
To test the low temperature mechanical properties of the product, the insulator was subjected to a freezing test. After several temperature cycles, the test crystal was subjected to a bending failure test at a low temperature. The test results show that the bending failure strength of the insulator at -40°C does not change significantly from room temperature.