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Method for improving insulating property of oil-impregnated paper of transformer

A technology for transformer oil and insulation performance, applied in insulators, organic insulators, organic liquid insulators, etc., can solve the problems of high cost, inability to fundamentally improve the insulation performance of oil-impregnated paper, and complex manufacturing process of new insulation paper, and achieve cost low effect

Inactive Publication Date: 2012-08-01
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The treatment of transformer oil can slow down the deterioration rate of the insulation strength of oil-impregnated paper to a certain extent, but it cannot fundamentally improve the insulation performance of oil-impregnated paper
The development of new insulating paper is expected to fundamentally improve the dielectric strength of oil-impregnated paper, but due to the complexity of the manufacturing process and high cost of new insulating paper, there are no relevant reports suitable for large-scale industrial applications.

Method used

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  • Method for improving insulating property of oil-impregnated paper of transformer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] The insulating cardboard is first dried and dehydrated in an oven at 105°C for 48 hours, and then vacuum-dried at 85°C for 48 hours before use. A titanium dioxide modifier with a particle size of 10nm was used to modify Karamay No. 25 transformer oil in an amount of 0.06% of the transformer oil to obtain a nano-material modified transformer oil (referred to as nano-oil). The pretreated insulating paperboard was immersed in pure transformer oil oil sample (abbreviation: pure oil) and nano oil sample, and treated under vacuum condition at 80°C for 48 hours to obtain pure oil paperboard and nano oil paperboard.

[0015] According to the ASTM D149 standard, the partial discharge inception voltage of two types of oil-impregnated paper was tested, and the results were as follows figure 1 shown. Depend on figure 1 From the results shown in a, it can be seen that after adding the titanium dioxide modifier, the partial discharge initiation voltage of the nano-oil-impregnated p...

Embodiment 2

[0017] The insulating cardboard is first dried and dehydrated in an oven at 105°C for 48 hours, and then vacuum-dried at 85°C for 48 hours before use. A titanium dioxide modifier with a particle size of 5nm was used to modify Karamay No. 25 transformer oil in an amount of 0.5% of the transformer oil to obtain a nano-material modified transformer oil (referred to as nano-oil). Immerse the pretreated shape insulating paperboard into pure transformer oil oil sample (abbreviation: pure oil) and nano oil sample, and treat it under vacuum condition at 80°C for 48 hours to prepare pure oil paperboard and nano oil paperboard.

[0018] According to ASTM D149 standard, the partial discharge inception voltage of two types of oil-impregnated paper was tested. After adding titanium dioxide modifier, the partial discharge inception voltage of nano-oil-impregnated paperboard was significantly improved compared with pure oil-impregnated paperboard. Nano-oil-impregnated paperboard The partial ...

Embodiment 3

[0020] The insulating cardboard is first dried and dehydrated in an oven at 105°C for 48 hours, and then vacuum-dried at 85°C for 48 hours before use. A zinc oxide modifier with a particle size of 2nm was used to modify Karamay No. 25 transformer oil in an amount of 0.01% of the transformer oil to obtain a nano-material modified transformer oil (referred to as nano-oil). The pretreated insulating paperboard was immersed in pure transformer oil oil sample (abbreviation: pure oil) and nano oil sample, and treated under vacuum condition at 80°C for 48 hours to obtain pure oil paperboard and nano oil paperboard.

[0021] According to ASTM D149 standard, the partial discharge inception voltage of two types of oil-impregnated paper was tested. After adding zinc oxide modifier, the partial discharge inception voltage of nano-oil-impregnated paperboard was significantly improved compared with pure oil-impregnated paperboard. The partial discharge initial voltage of the paperboard can ...

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Abstract

The invention discloses a method for improving the insulating property of oil-impregnated paper of a transformer, which belongs to the technical field of oil / paper insulation for electrical equipment. According to the method, a modifier is added into an oil-impregnated paper insulation system for the electrical equipment, the insulating property of an oil-impregnated paper board is enhanced by the dissipating and transporting effects of the modifier on charges in the oil-impregnated paper and the enhancement of the insulating property has important significance for improving the safety operating ratio of the large-scale electrical equipment and reducing the insulating fault rate.

Description

technical field [0001] The invention belongs to the technical field of oil / paper insulation for electrical equipment, and in particular relates to a method for improving the insulation performance of transformer oil-immersed paper. Background technique [0002] Oil-immersed high-voltage electrical equipment such as large-scale power transformers, transformers, bushings, and oil-filled power cables are the main equipment of the power system, and are responsible for important tasks such as power transmission and measurement. Due to the high cost of large-scale power equipment, once a failure occurs, it will not only cause a large-scale power outage, but also cause immeasurable losses to the power system and the national economy. A large number of statistical data show that the main cause of power equipment failure is the decline and deterioration of its oil-paper insulation performance. Oil-paper insulation is the main form of insulation for important power equipment such as ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B19/00H01B3/20
Inventor 吕玉珍李成榕杜岳凡张胜男陈牧天刘通
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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