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Evaluation method for ageing state of composite insulator

A composite insulator, aging state technology, used in measuring devices, material analysis by optical means, instruments, etc., can solve the problems of high experimental conditions, difficult to obtain, different physical and chemical properties, etc., to achieve simple and convenient operation and eliminate human factors. , the effect of simplifying the operation procedure

Inactive Publication Date: 2015-07-08
广西电网有限责任公司河池供电局
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method requires high experimental conditions, requires a certain polarization temperature and planned electric field strength, and the experimental steps are complicated, so it is not suitable to be popularized in actual measurement.
Especially when conducting control tests, it is necessary to select the known aging degree or unaged samples of this type of composite insulator as the standard, and there are many types of composite insulators, and the physical and chemical properties of the shed silicone rubber materials are different between different types, and Generally, the umbrella skirts are used for about 10 years, and it is difficult to obtain unaged control samples of the same model

Method used

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  • Evaluation method for ageing state of composite insulator
  • Evaluation method for ageing state of composite insulator
  • Evaluation method for ageing state of composite insulator

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Select a composite insulator running on a high-voltage line, take an insulator shed on the low-voltage side of the insulator, and select a cylindrical sample at the position with the smallest surface aging degree on the shed. The diameter of the sample is 20 mm, and use a slicing device to The sample is cut into a test piece with a thickness of 1 mm, and the test pieces at five positions of the upper surface, the upper middle, the middle, the lower middle and the lower surface are sequentially obtained. At the same time, take the new product of the composite insulator mentioned above as a control sample, and cut a test piece. Using Fourier transform infrared spectrometer to carry out aging test on samples with different depths of sheds, the results are as follows figure 2 and shown in Table 1.

[0037] Table 1. Wavenumbers of FTIR spectra of test pieces with different depths of the shed

[0038] Location C-H Si-CH3 Si-O-Si Si-(CH3)2 upper surfa...

Embodiment 2

[0041] The composite insulator A of a manufacturer operating on the 220 kV line in the coastal area of ​​Hebei Province for about 10 years was selected as the research object.

[0042] Step a: Take the test piece: Take the high-voltage side and medium-voltage side sheds of the composite insulator A, divide the sheds into four right-angle fan-shaped areas with the mandrel as the center, and cut a 20mm-diameter section in each area with a sampling device. Cylindrical samples. And use a slicing device to cut the sample into several test pieces with a thickness of 1 mm along the axial direction. Take the upper surface test piece of each sample as the test piece to be tested.

[0043] A set of equipment suitable for sample preparation of on-site composite insulator sheds is used for sampling. The equipment is the sampler and slicing mechanism introduced in the patent 201310341441.3 titled A Method for Testing the Aging Degree of Silicone Rubber Composite Insulators. The sampler ca...

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Abstract

The invention provides an evaluation method for the ageing state of a composite insulator. The method comprises the following steps: selecting the umbrella skirt of an insulator at a high-voltage or medium-voltage side of a string of insulators, taking samples at different positions and slicing the samples into test pieces; taking a middle test piece of the umbrella skirt of an insulator at a low-voltage side as a reference test piece; detecting the ageing degree of each test piece by using Fourier spectrometry and calculating the change rate of the mean values of absorption peaks of test pieces at different directions relative to the reference test piece; and evaluating the ageing degree of the composite insulator according to the change rate. According to the method, the ageing state of the composite insulator is quantitatively analyzed through standardized sampling and evaluating programs; and the method has the characteristics of simple and convenient testing and high accuracy.

Description

technical field [0001] The invention relates to the technical field of insulators, in particular to a method for evaluating the aging degree of insulators under high-voltage conditions. Background technique [0002] With the development of UHV projects, composite insulators are increasingly used in UHV transmission and distribution lines. The outer insulating material of the composite insulator is silicone rubber, and its aging problem further appears with the increase of the voltage level and the deterioration of the operating environment during operation. However, composite insulators started late in UHV engineering, and practical experience and experimental data are relatively scarce. Therefore, the evaluation of long-term aging resistance and remaining life of composite insulators has attracted widespread attention as a key issue in UHV engineering construction. [0003] The aging process of on-site insulators generally exposes aging traces from some parts first, and th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/3563
Inventor 莫小向韦景兰永林蒙正朝崔春艳
Owner 广西电网有限责任公司河池供电局
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