Composite insulator and porcelain insulator than advantage where organic composite insulator
, composite insulator has also been called rubber insulator or porcelain insulator, it is composed of two or more materials in organic synthesis of composite insulator, now in line bar hanging type composite insulator, for example for discussion.
The basic structure of composite insulator mandrel, an umbrella skirt sheathed, adhesive layer and the hardware.
Composite insulator mandrel is mechanical load bearing parts, but it is also the main part of the internal insulation, it has high mechanical strength, insulation performance and long-term stability, FRP rod materials now used resin enhanced unidirectional glass fiber pull rod.
Umbrella skirt sheath is the external insulation of composite insulator part, its role is to make high voltage insulator has a high enough moisture flash external insulation performance and the pollution flashover, and protect core rod from the external atmosphere.
Umbrella skirt sheath perennial exposed to outdoor atmosphere, stand in the sun, rain, heat, cold and other severe weather conditions, natural (under
Fly ash, salt and sea pollution)
And industrial pollution that under the condition of the dirt and wet may suffer from spark discharge or partial arc ablation.
Usually requires an umbrella skirt sheath material must have excellent resistance to pollution flashover, tracking resistance and electrical erosion resistance, and resistance to ozone high and low temperature atmospheric aging effect.
Excellent resistance to composite insulator pollution flashover ability is mainly determined by the umbrella skirt sheath material.
It is directly related to aging, long run umbrella skirt sheath is one of the important external insulation composite insulation parts.
Adhesive layer is the core and protects the interface of the suite, it well versed in both ends, the question of hardware is another major part of the internal insulation composite insulator, such as the interface bonding is bad becomes weakness of internal insulation.
Hardware is the mechanical load transfer component of composite insulator, it with mandrel together constitute a composite insulator fittings, through this connector with poles and wire connection, and pass the mechanical load.
Hardware structure of the stand or fall of directly influencing the full play of the core strength and mechanical properties of the insulator.
Can be seen from the effect of four parts, the composite structure of the main characteristic of composite insulator is give full play to the FRP rod materials sheath material of high mechanical strength and umbrella skirt atmospheric aging resistance good advantages, thus insulating structure is very reasonable.
Composite insulator from the structure to the material is completely different from traditional porcelain or glass insulators, performance is also different from the distinctive features of porcelain or glass insulators, has the following points: (generalizing
Composite insulator used in the glass steel reinforced bars with axial tensile strength is very high, generally in more than 600 mpa, 5 ~ 10 times that of China, with the strength of high quality carbon steel.
In addition, the proportion of core material is only 2.
0 is much lighter than steel;
The proportion of umbrella skirt material is less than 2.
0 and composite insulator can more easily create specified mechanical load the strength level of the hundreds of thousands of cows, quality only disc suspension insulator of 10% ~ 15%.
Ultrahigh pressure line in a mountainous area construction and the accident emergency, synthetic insulation to the advantage of light quality, not afraid of falling damage, has been well received by the operation and construction personnel.
Belong to the composite insulator rod insulator structure, inside and outside almost equal polar distance, generally does not happen internal insulation breakdown, also don't need to detect zero maintenance work.
Composite insulators umbrella skirt sheath material is organic polymer material, low surface energy, strong hydrophobic.
Fall in the water on the surface of the skirt are many tiny water droplets separated from each other, forming a continuous film without conductive layer, and leakage current is small, difficult to form the local electric arc, it is not easy to occur along the surface pollution flashover.
Because the mandrel intensity is high, the suspension insulator rod diameter and umbrella diameter is much smaller than the porcelain insulator string, the shape coefficient is big, on the surface dirt and surface conductivity under the same conditions, also the surface resistance is higher than shape coefficient of the porcelain insulator string.
Insulator pollution lightning has a direct relationship between pressure and surface resistance, surface resistance is big, small leakage current, corresponding lightning pressure is high.
Laboratory test results and running experience has confirmed that the composite insulator pollution flashover performance is high, the pollution flashover accident happens rarely.
Easy operation maintenance.
Impurity cleaning the pollution flashover performance is high, don't have to, and not to detect zero value, the current domestic all kinds of voltage grade of composite insulator are not traditional, heavy cleaning and zero maintenance, greatly reduced the maintenance work.
In addition, composite insulator manufacturing technological process is simple, low building investment.
The processing of composite insulator forming temperature is below 200 ℃, 1270 ℃ lower than the electric porcelain firing temperature, significantly reduce energy consumption, is a kind of energy-saving products.
Compared with porcelain insulator, composite insulator price reduced year by year, with the increase of voltage grade, requirements of insulator mechanical strength also increase, but also increases the difficulty of porcelain insulator manufacture, cost increase.
At present domestic 500 kv, 220 kv and 1 l0kv composite insulator price is lower than the same voltage grade of porcelain insulator, basically the same.
Considering the effect of the composite insulator installation again as low transportation cost and operation maintenance is simple, can save the construction and maintenance, as well as to gauge and decrease the loss of large area pollution flashover accident, the comprehensive economic benefit and social benefit of composite insulator is immeasurable.
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