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Study on Testing Method of DC Artificially Iced Disk-shaped and Suspension Insulators

Author: YangJianLan
Tutor: ShuLiChun
School: Chongqing University
Course: Electrical Engineering
Keywords: icing insulators DC voltage Pre-polluting methods charged icing electrical test method
CLC: TM216
Type: Master's thesis
Year: 2009
Downloads: 82
Quote: 3
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Abstract

Due to the exploitation of Western China and the West-to-East Power Transmission, there will be a dramatic increase of UHV DC transmission lines extended through the western high altitude and icing districts. Artificial icing test has been used as insulation icing an important means test for long. And now, based on the testing method on study under characteristics of external insulation of porcelain and glass insulators iced DC transmission lines, there is no one uniform standard, meanwhile, the test methods and results vary evidently. Therefore, it has great significance to research DC icing test methods on disk-shaped suspension insulator for study of DC transmission line characteristics of external insulation.Based on experiments carried out in great type and more function artificial climate chamber-with a diameter of 7.6 meters and a height of 11.6 meters and in an low temperature and low pressure test chamber-with a diameters of 2 meters and a length of 3.8 meters,in order to investigate the flashover performance of the iced insulators strings, adopting mathematical statistical methods, by comparing the differences and corresponding relationship of test result under charged and non-charged icing test mode; the differences and equivalence of test result under two kinds of pre-polluting methods; the differences and equivalent relationship of test result under 3 kinds of test methods,this paper has bring forward the DC icing test methods of disk-shaped suspension insulator.Based on the test and its effect analyze, this paper obtain main conclusion as following:①Charged icing way will causes the difference of iced weight and ice distribution on insulators, the relationship between the iced DC flashover voltage of insulators and ice water conductivity (γ20) without exception into a power function at the condition of charged icing way and non-charged icing way, icing test can adopt non-charged icing way instead of charged icing way;②It will causes the flashover path of insulators when adopoting solid layer pollution method and ice water conductivity method to simulate pollution,it has equivalent effection in iced flashover voltage of insulators;③Iced flashover voltage gained by different test methods at the same salt concentration (SDD) or ice water conductivity (γ20) shows difference significantly, among others, the average flashover voltage gained by the way of equably boosting voltage is the highest , the U50% gained by the way of constant voltage under up-down manner to be followed by, the minimum flashover voltage gained by the way of "U"-shaped curve is the lowest;④It has equivalent relationship between the average flashover voltage Uave gained by the way of equably boosting voltage and the U50% gained by the way of constant voltage under up-down manner; It has equivalent relationship between the minimum flashover Ufmin voltage gained by the way of "U"-shaped curve and the U50% gained by the way of constant voltage under up-down manner;⑤It has bring forward the conditions of parameters controlling in artificial DC glaze icing on disk-shaped suspension insulator and the test procedures under 3 kind of test method which is the constant voltage under up-down manner,the equably boosting voltage way and the "U"-shaped curve way.

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CLC: > Industrial Technology > Electrotechnical > Electrical materials > Insulating materials,dielectric,and its products > Insulator and casing
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