A kind of modified insulating paper, its preparation method and oil-impregnated insulating paper medium body

A technology of insulating paper and modification, which is applied in the field of its preparation, modified insulating paper, and oil-impregnated insulating paper medium body, can solve the problem of charge accumulation at the oil-paper insulation interface, and cannot effectively solve the problem of accumulation, and achieves Effects of space charge reduction, interface charge suppression, and safe operation

Active Publication Date: 2019-10-18
CHONGQING UNIV
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AI Technical Summary

Problems solved by technology

Among them, local insulation structure adjustment and better oil-paper combination can improve the insulation performance to a certain extent, but they cannot effectively solve the problem of oil-paper insulation interface charge accumulation under the action of DC electric field components; and nano-modification measures mainly achieve suppression The accumulation of space charges in the medium body of oil-impregnated insulating paper cannot solve the problem of the accumulation of charges at the oil-paper insulation interface, and there are no related reports on how to suppress the charge at the oil-paper interface

Method used

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  • A kind of modified insulating paper, its preparation method and oil-impregnated insulating paper medium body
  • A kind of modified insulating paper, its preparation method and oil-impregnated insulating paper medium body
  • A kind of modified insulating paper, its preparation method and oil-impregnated insulating paper medium body

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preparation example Construction

[0043] The present invention also provides a method for preparing modified insulating paper described in the above technical solution, comprising the following steps:

[0044] The Al target is subjected to magnetron sputtering in a mixed gas environment, and deposited on an insulating paper substrate to form a micro-nano structure Al 2 o 3 Film layer, obtains modified insulating paper;

[0045] The mixed gas is argon and oxygen.

[0046] Among them, the insulating paper and micro-nano structure Al 2 o 3 The type, thickness, etc. of the film layer are consistent with the above-mentioned technical solution, and will not be repeated here.

[0047] According to the present invention, an Al target is used for magnetron sputtering; in the present invention, the purity of the Al target is preferably above 5N (ie 99.999%). The present invention has no special limitation on the sputtering distance of the magnetron sputtering, that is, the distance between the target and the substr...

Embodiment 1

[0060] 1.1 Preparation of modified insulating paper:

[0061] Using insulating paper (provided by State Grid Nanrui Borui Transformer Factory, with a thickness of 0.5mm) as the substrate, Al as the target, and the sputtering distance is 10cm, the sputtering chamber is evacuated to 4.5×10 -3 Pa, into the sputtering chamber into argon and oxygen, the argon gas pressure is 1Pa, the oxygen flow rate is 20sccm, sputtering 90min under the sputtering power 110W, on the surface of one side of the insulating paper substrate, a light white substance is deposited. Nanostructured Al 2 o 3 film layer to obtain modified insulating paper S'.

[0062] 1.2 Appearance and microscopic characterization:

[0063] (1) The appearance of unsputtered insulating paper and modified insulating paper after sputtering is as follows image 3 As shown, among them, image 3 a is modified insulating paper, image 3 b is the unmodified insulating paper. Compared with the unmodified insulating paper, the s...

Embodiment 2

[0078] 2.1 Preparation of oil-impregnated insulating paper medium body: The insulating oil (Xinjiang Karamay 25# insulating oil) is dehydrated and degassed to meet the national standard requirements of GB2536-2011 unused mineral insulating oil for electrical fluid transformers and switches. Al 2 o 3 Nano-modified insulating paper [that is, the insulating paper contains Al 2 o 3 Nanoparticles, prepared by the High Pressure Laboratory of Chongqing University, according to the preparation method of the document "Effect of Nano-Al2O3 on the Thermal Aging PhysicalProperties of Insulating Paper" (2016 International Conference on Condition Monitoring and Diagnosis, 2016, pp.40-43.) get] and without Al 2 o 3 Dry the insulating paper before nano-modification to keep the water content below 1%; then vacuum impregnate the insulating paper with insulating oil at a vacuum degree of 50Pa and 40°C, and continue to immerse in oil for 48 hours to obtain an oil-impregnated insulating paper ...

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Abstract

The invention provides modified insulation paper, a preparation method thereof and an oil-immersed insulation paper dielectric body. The modified insulation paper disclosed by the invention comprises insulation paper and a micro-nano structure Al2O3 film layer compounded on the surface of the insulation paper. When being used, the modified insulation paper disclosed by the invention not only can restrain space charges of an oil-paper insulation structure in an oil-paper insulation system, but also can more effectively restrain interface charges of the oil-paper insulation structure. Therefore, insulation faults of discharge and the like in operation of a converter transformer are effectively relieved and reduced, and the safe operation of the converter transformer is guaranteed.

Description

technical field [0001] The invention relates to the technical field of power transmission, in particular to a modified insulating paper, a preparation method thereof and an oil-impregnated insulating paper medium body. Background technique [0002] In terms of long-distance large-capacity power transmission, cross-sea power transmission, and grid connection, HVDC transmission has many unique advantages compared with AC transmission and has developed rapidly. The converter transformer is an important equipment in the DC transmission system, which is used to realize the connection between the AC transmission network and the DC transmission network. There is an oil-paper insulation system in the valve side winding of the converter transformer, which mainly includes an oil-paper insulation structure formed by insulating oil and insulating paper (the insulating paper is usually oil-impregnated insulating paper, that is, insulating paper impregnated with insulating oil) (see figu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21H19/72D21H23/46D21H27/12H01B3/52
Inventor 郝建廖瑞金杨丽君李剑李彦青但敏邹润豪左志平段溢政李超
Owner CHONGQING UNIV
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