Pollution flashover test method for simulating erosion and ageing of RTV coating on insulator surface

A test method and insulator technology, applied in the direction of testing dielectric strength, measuring devices, instruments, etc., can solve the problems of complex equipment, long time-consuming, long test cycle, etc., and achieve the effect of preventing flashover

Active Publication Date: 2019-07-16
ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY +1
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, the traditional method has complex equipment and long test period, which is not conducive to rapid evaluation
For example, the Chinese invention patent "Evaluation Method for Aging RTV Coating on Insulator Surface" (Application No. 201610179799.4) proposes an evaluation method for RTV peeling and shedding. Hydrophobic, but there is still a lack of aging simulation tests for RTV surface carbonization or even melting caused by high temperature and high current effects of RTV insulator surface leakage current, creeping discharge and flashover arc
Another example: the standard "GB / T 6553-2014 Test Method for Evaluating Tracking Resistance and Corrosion Aging of Electrical Insulating Materials Used under Severe Environmental Conditions" adopts the inclined plane method to coat the flat sample with dirty liquid, continuously Apply a small voltage to the sample to maintain the corrosion and aging state of the surface of the sample, and evaluate whether the sample can pass the standard test by grade. However, this method takes a long time and cannot simply and quickly simulate the RTV on the surface of the insulator currently in operation. The corrosion and aging state of the coating cannot be qualitatively evaluated whether the insulator in operation still has certain pollution withstand voltage characteristics, and thus it is impossible to judge whether the insulator can continue to be used

Method used

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  • Pollution flashover test method for simulating erosion and ageing of RTV coating on insulator surface
  • Pollution flashover test method for simulating erosion and ageing of RTV coating on insulator surface
  • Pollution flashover test method for simulating erosion and ageing of RTV coating on insulator surface

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Experimental program
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Effect test

Embodiment 1

[0037] A pollution flashover test method for simulating the corrosion and aging of the RTV coating on the surface of an insulator, comprising the following steps in sequence:

[0038] 1) completely wrapping the insulator coated with RTV coating with flexible thermal insulation material 102;

[0039] 2) Select a strip-shaped area on the outer surface of the flexible heat insulating material 102;

[0040] 3) Cut and remove the flexible heat insulating material 102 at the elongated area with a cutter, and the area on the outer surface of the RTV coating exposed in the elongated hole formed after cutting is the simulated erosion and aging zone;

[0041] 4) Burn the outer surface of the RTV coating at the simulated corrosion aging zone with a spray gun with a flame epitaxy temperature of 1000°C, and control the outer surface of the RTV coating to be damaged according to the actual corrosion and aging degree of the RTV coating in actual online operation. The final degree of burning...

Embodiment 2

[0044] On the basis of the above-mentioned embodiment 1, further preferably, in step 2), the selection method of the elongated area on the outer surface of the flexible heat insulating material 102 on the shed of the insulator is: in the flexible heat insulating material 102 Determine a starting point every interval a on the inner diameter line of the annular outer surface, and determine n starting points in total;

[0045] Taking the direction perpendicular to the outer diameter edge 104 of the shed from the starting point as the vertical erosion aging direction, draw a line along the vertical erosion aging direction on the outer surface of the flexible heat insulating material 102 to make a vertical direction with a width b In the strip-shaped area, the flexible heat insulating material 102 at the vertical strip-shaped area is cut and removed to form a vertically strip-shaped hole, and the area on the outer surface of the RTV coating exposed in the vertically strip-shaped hol...

Embodiment 3

[0048] On the basis of the above-mentioned embodiment 2, further preferably, in step 2), the interval a is determined according to the density of the actual erosion and aging of the RTV coating on the simulated on-line running insulator:

[0049]

[0050] The meaning of the formula in this embodiment 3 is: when the actual corrosion and aging intensity of the RTV coating on the simulated on-line insulator is intensive corrosion, a=2cm; when the simulated on-line operation When the actual corrosion and aging intensity of the RTV coating on the insulator is moderate corrosion, a=4cm; when the actual corrosion and aging intensity of the RTV coating on the simulated on-line operating When damaged, a=6cm.

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Abstract

The invention provides a pollution flashover test method for simulating erosion and ageing of an RTV coating on an insulator surface. The pollution flashover test method comprises the steps that firstly, a flexible thermal insulation material is used for completely wrapping an insulator coated with the RTV coating, a strip-shaped area is chosen on the outer surface of the flexible thermal insulation material, the flexible thermal insulation material in the strip-shaped area is removed through a cutter and a simulated erosion and ageing belt on the outer surface of the RTV coating is exposed, the RTV coating surface of the simulated erosion and ageing belt is then burned by using a high temperature spraying gun, and at last a pollution withstand pressure test is carried out on the insulator. According to the pollution flashover test method, the pollution flashover resistance level and the service life of the insulator are judged simply, quickly and accurately, the high temperature of aleakage electric current, surface discharge and a flashover electric arc, and RTV coating carbonization caused by the action of a large current and even a melted pollution flashover test can be further simulated, so that the insulator reaching the life time limitation can be changed timely, and the occurrence of a flashover situation is prevented.

Description

technical field [0001] The invention relates to the field of electrical insulation performance test research of an external insulation anti-pollution flashover coating, in particular to a pollution flashover test method for simulating the erosion and aging of an RTV coating on the surface of an insulator. Background technique [0002] Room Temperature Vulcanized Silicone Rubber (RTV) has excellent hydrophobicity and hydrophobic mobility, which can significantly improve the pollution flashover voltage of insulators, and is widely used in power systems in my country. However, as an organic material, RTV is prone to aging under complex atmospheric and electromagnetic field conditions, especially in ultra-high voltage and ultra-high voltage transmission substations and transmission lines with high voltage levels, the aging phenomenon of RTV is significantly accelerated. RTV aging will cause it to lose its surface properties and lose its significance for insulator protection. Th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/12
CPCG01R31/1245
Inventor 赵洺哲李辛庚姜波李文静王晓明樊志斌吴亚平闫风洁王蝶宗立君郭凯张振岳米春旭高智悦朱耿憎
Owner ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY
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