Compared with the performance of the different high voltage insulator material parameters of high voltage insulator type is various, there are many kinds of classification methods.
According to the main insulation materials including porcelain, glass and composite insulator
Porcelain and glass insulator is currently widely used insulator, composed of organic material as a new type of insulator, composite insulator due to its unique superiority in the application of the electric power system became more and more widely.
In the area of uhv dc composite insulator will be the main choice.
Different insulation materials have different insulation performance, so the three kinds of different material dc pollution flashover characteristics of insulators, porcelain and glass insulator dc pollution flashover characteristic difference;
Dc pollution flashover characteristic of composite insulator is much better than that porcelain and glass insulator.
Under the condition of actual at an altitude of 1970 m, insulator dc pollution flashover characteristics of three different material for the research of the system, and the (
The same test conditions, the up and down surface filth uniform distribution, glass and porcelain insulator are bell jar type insulator)
For the unit (
Insulation distance of lightning pressure.
Glass insulator dc pollution lightning pressure was slightly lower than the same tonnage porcelain insulator, but not much difference;
Different tonnage of dc pollution flashover characteristics of porcelain insulator were similar, shows that under the condition of high altitude, because of the arc bridge is serious, the market size, the insulation of the large-tonnage to cannot effectively improve the dirt lightning pressure;
Pollution flashover characteristic of composite insulator has an obvious advantage over that porcelain and glass insulator;
Composite insulators umbrella skirt structure optimization effect is very obvious, can effectively improve the insulation composite insulator unit distance of lightning pressure.
High voltage insulator umbrella skirt shape research at home and abroad many experts believe that the influence of dc composite insulator pollution pressure is mainly determined by creepage distance of lightning, the umbrella skirt structure of composite insulator pollution lightning pressure impact.
For uhv dc composite insulators
umbrella skirt structure has carried on the exploratory study, the results showed that the umbrella skirt structure of dc composite insulator and is directly related to the pressure of the dc pollution lightning, presents a certain regularity, and the reasonable change of composite insulators umbrella skirt structure can improve the dc pollution lightning pressure (
Up to 20 more than 9/6)
After, the umbrella skirt structure optimization not only improves the utilization of creepage distance, also greatly improve the insulation distance of lightning pressure of the unit, so the umbrella skirt structure on dc pollution flashover characteristic of composite insulator has a great influence.
The experimental results show that dc composite insulators umbrella skirt structure on fouling lightning has a great influence on pressure, creepage distance is not a decision * important factors in pollution flashover resistance ability.
The research results to the design of uhv dc external insulation has enlightening significance, the umbrella skirt structure optimization design of composite insulator can shorten the long line of high voltage insulator string, narrow tower size of saving construction cost greatly.
The experiment is a preliminary exploratory research, research should be further developed, and the * will give an umbrella skirt structure and the direct relationship between the pressure of the dc pollution of lightning, and for the construction of the uhv dc transmission provide dc pollution flashover characteristics * composite insulators umbrella skirt structure.
At high altitude, heavy impurity region of uhv dc lines, if use electric porcelain or glass insulators, technology and economy is backward, so the composite insulator is the uhv dc transmission project to solve the inevitable choice of external insulation.
But a series of basic questions about how to select the dc composite insulator hasn't been solved yet, so urgently need deep research the following questions: 1)
Composite insulator testing methods of the research on artificial contamination test method of composite insulator questions are based on the standard advice, this research will make the results have the comparability of different research institutions, the fouling resistance method is used to choose external insulation is feasible, and can thus solve the problem of artificial and natural filthy equivalence, at the same time for uhv dc lines choose external insulation composite insulator guideline to provide theoretical support and scientific basis.
Dc composite insulators umbrella skirt structure optimization research umbrella skirt structure optimization can improve the composite insulator pollution flashover characteristic, effectively improve the dirty lightning pressure unit insulation distance, can shorten the line insulator string is long, narrow tower size of saving construction cost, is the dc uhv power transmission project construction is very important and urgent need to solve the problem.
External insulation design of fouling is compression method and actual operation directly contact line insulator pollution resistance ability, is the ideal insulator string length determining method, need to be studied deeply, accumulate experience, and vigorously promoted.
Compared with electric porcelain and glass insulator, composite insulator suspension insulator in the dc pollution flashover characteristic advantage is very obvious, so the construction of uhv dc transmission, composite insulator is a reasonable choice to solve the problem of external insulation.
Artificial contamination test method of composite insulator is uhv dc lines in composite insulator external insulation selection guideline set key fundamental problems, the need for deep research.
Umbrella skirt structure on dc pollution flashover characteristic of composite insulator has a great influence, in order to improve the dc of composite insulator pollution lightning pressure, effective shorten uhv line of composite insulator string length, save engineering investment cost, the urgent need for composite insulators umbrella skirt structure optimization design.
On a message: to prevent high voltage insulator pollution flashover method 】
A message: under high voltage insulator installation security considerations, and dangerous point control 】
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