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Field intensity design method of insulator

A design method and technology of insulators, applied in the direction of insulators, design optimization/simulation, calculation, etc., can solve problems such as damage to line use and operating life, and achieve the effect of improving insulation performance

Inactive Publication Date: 2019-04-12
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Insulators play two basic functions in transmission lines, namely, supporting wires and preventing current from returning to ground. These two functions must be guaranteed. Insulators should not fail due to flashover breakdown caused by changes in the environment and electrical load conditions. Otherwise, the insulator will lose its function, which will damage the service life and operating life of the entire line

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0049] Step 1): In SF 6 / N 2The DC superimposed impact test was carried out on the 126kV pot insulator in the mixed gas, and the maximum flashover field strength of the pot insulator under 0.1MPa was 4.07kVmm;

[0050] Step 2): According to SF 6 / N 2 Impulse flashover characteristics of pot insulators in mixed gas, and combined with empirical formulas in literature, the maximum flashover field strength of pot insulators under 0.7MPa is 14.25kV / mm;

[0051] Step 3): Referring to the corresponding relationship between the maximum flashover field strength of the AC insulator and the design field strength, the design field strength of the insulator should be 2 / 3 of the maximum flashover field strength of the basin-type insulator at 0.7MPa, and obtain the control field strength of the DC insulator The recommended value is 9.5kV / mm;

[0052] Step 4): Using the dynamic simulation model to optimize the design of the DC basin insulator, the design value of the field strength of the...

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PUM

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Abstract

The invention belongs to the technical field of production and manufacturing of power technological equipment, and in particular to a field intensity design method of an insulator. The field intensitydesign method of the insulator, provided by the invention, comprises the steps of performing DC superposition impact experiment on the insulator in an insulation gas to obtain maximum flashover fieldintensity of the insulator under a low voltage; obtaining maximum flashover field intensity of the insulator under air pressure in a DC pipeline in a usage state according to impact flashover characteristic of the insulator in the insulation gas and by combining a document empirical formula; obtaining a control field intensity primary suggestion value of a DC insulator according to a corresponding relation between the maximum flashover intensity of an AC insulator and the design field intensity; designing the DC insulator by a dynamic simulation model, obtaining the design field intensity ofthe insulator in the insulation gas, and obtaining design margin; designing insulators with different shapes and resistivity, performing DC superposition impact experiment examination, and verifying reasonableness of the design field intensity and the design margin of the insulator; and obtaining the design field intensity of the insulator.

Description

technical field [0001] The application belongs to the technical field of electric power technology equipment production and manufacturing, and in particular relates to a field strength design method of an insulator. Background technique [0002] When the voltage acting on the insulation exceeds a certain critical value, the insulation will be damaged and lose its insulation effect. Usually, the dielectric strength of power equipment is expressed by breakdown voltage; while the dielectric strength of insulating materials is expressed by average breakdown electric field strength, referred to as breakdown field strength. The breakdown field strength refers to the voltage at which breakdown occurs divided by the distance between the two electrodes to which the voltage is applied under specified test conditions. Dielectric strength is usually determined by experiment. Dielectric strength varies substantially with the type of insulation. The creeping discharge at the interface ...

Claims

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Application Information

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IPC IPC(8): H01B19/00G06F17/50
CPCG06F30/20H01B19/00
Inventor 屠幼萍陈庚马国明周宏扬王璁艾昕
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)