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Evaluation method of composite insulator aging state based on hygroscopicity and dielectric properties

A technology for composite insulators and dielectric properties, which is applied in the fields of dielectric property measurement, dielectric strength testing, and electrical variable measurement.

Inactive Publication Date: 2018-05-25
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

[0004] Dielectric loss is widely used by scholars at home and abroad in the research of aging state evaluation of insulating equipment and materials, such as polyimide film, oil-impregnated paper, polyethylene cable, motor winding and glass insulator, etc. Evaluate its aging state, but there is no report on the dielectric loss characteristics of composite insulator silicone rubber materials in the aging process

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  • Evaluation method of composite insulator aging state based on hygroscopicity and dielectric properties
  • Evaluation method of composite insulator aging state based on hygroscopicity and dielectric properties
  • Evaluation method of composite insulator aging state based on hygroscopicity and dielectric properties

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Embodiment 1

[0053] Composite insulator samples with different operating years in Qinghai, a typical area, were selected for aging scoring.

[0054] (1) Since the electric field strength of the first shed at the high-voltage end of the composite insulator is the strongest compared to other sheds during operation, cut off the first shed at the high-voltage end of the composite insulator that needs to be rated for aging, and take the upper The surface silicone rubber material is prepared into a circular sheet sample with a diameter of 3cm and a thickness of 0.7±0.1mm, such as figure 1 shown. The samples include C4, C6, and C11, which refer to composite insulator samples with service life of 4 years, 6 years, and 11 years in Qinghai area, respectively.

[0055] (2) Wipe the sample with absolute ethanol to remove surface contamination, and then put it into a DHC-9070A electric heating constant temperature blast drying oven for drying, set the temperature at 50°C, and unify the state of the sa...

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Abstract

The invention belongs to the technical field of voltage and insulation, and particularly relates to a composite insulator aging state evaluation method based on hygroscopicity and a dielectric property. A piece of umbrella skirt of a high voltage end of a composite insulator to be tested is cut, a silicone rubber material of a surface layer of the umbrella skirt is taken to be made into a circular sheet sample with a diameter of 3cm and thickness of 0.7+ / -0.1mm, after the sample is subjected to surface treatment and is dried, a dielectric loss test in a moisture absorption process with humidity of 80% is carried out, a saturated dielectric loss factor is determined, and a sample aging score is obtained according to the saturated dielectric loss factor and a scoring formula S=56.41+56.58e-12.35*tan[delta], thereby judging the aging degree of the composite insulator. By implementation of the composite insulator aging state evaluation method, the aging degree of the silicon rubber material of the composite insulator can be judged accurately and sensitively, and the aging states of samples of different areas can be scored in a unified manner, thereby providing suggestions for reference for formulation of a maintenance schedule of an operation department.

Description

technical field [0001] The invention belongs to the technical field of voltage and insulation, in particular to a method for evaluating the aging state of composite insulators based on hygroscopicity and dielectric properties. Background technique [0002] Composite insulators are important insulation equipment for transmission lines. Compared with glass and porcelain insulators, composite insulators have the advantages of strong pollution flashover resistance, light weight, high mechanical strength, and easy transportation. However, the macromolecules constituting the organic material are easily broken because the covalent bond and the force binding each molecule in the organic material are relatively weak. Therefore, as the service life increases, the aging of the silicone rubber material of the composite insulator is more serious than that of other types of insulators. The aging of composite insulator silicone rubber materials will lead to the decline of its mechanical a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/12G01R27/26
CPCG01R27/2694G01R31/12
Inventor 屠幼萍姜艺楠梁栋王璁王景春
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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