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Transformer paper oil insulation experiment device integrated with electric heating combination ageing and partial discharge

A transformer oil, partial discharge technology, applied in the direction of testing dielectric strength, testing ship construction, etc., can solve problems such as large difference in results, no obvious correlation between aging states, and no longer practical, and achieve good air tightness, Good test effect, convenient operation effect

Active Publication Date: 2013-05-15
STATE GRID CHONGQING ELECTRIC POWER CO ELECTRIC POWER RES INST +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But these methods all have certain deficiencies: the dissolved gas in DGA oil can not only come from paper aging, but also various gases will be produced during the oil aging process; furan derivatives are special products in the aging process of cellulose, but their concentration It will be affected by the thermosyphon and oil filter; DP and TS need to be measured off-line with a hanger, and the results obtained at different paper locations are quite different; the acid value and micro-water content in oil have an important impact on the aging process, but with No clear correlation between aging status
Therefore, the inherent defects of traditional diagnostic methods make them no longer practical, and the rapid development of power systems urgently requires research on online assessment methods for the aging state of power transformer oil-paper insulation that can overcome the shortcomings of traditional chemical methods

Method used

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  • Transformer paper oil insulation experiment device integrated with electric heating combination ageing and partial discharge
  • Transformer paper oil insulation experiment device integrated with electric heating combination ageing and partial discharge
  • Transformer paper oil insulation experiment device integrated with electric heating combination ageing and partial discharge

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Experimental program
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Effect test

Embodiment 1

[0050] figure 1It is a transformer oil-paper insulation electric heating combined aging test device; figure 2 It is a high-voltage needle electrode / column electrode / ball electrode; image 3 It is the sealing cover and its waterline groove; Figure 4 Wiring for the partial discharge test platform; Figure 5 It is a corona discharge defect model electrothermal combined aging device; Figure 6 It is the PRPD spectrum of 24kV corona discharge under combined electrothermal aging; Figure 7 It is an electrothermal combined aging device for surface discharge defect model; Figure 8 It is the PRPD spectrum of 23kV surface discharge under combined electrothermal aging; Figure 9 It is an electrothermal combined aging device for the air gap discharge defect model; Figure 10 It is the PRPD spectrum of 7kV air-gap discharge under combined electrothermal aging, as shown in the figure: a transformer oil-paper insulation electrothermal combined aging and partial discharge integrated ...

Embodiment 2

[0072] The difference between this embodiment and embodiment 1 is only:

[0073] see figure 1 , The transformer oil-paper insulation defect model of the preferred embodiment is an electrothermal combined aging test and partial discharge integrated test device, referred to as an aging tank, which includes a high-voltage part, a low-voltage part and a sealed tank part.

[0074] The high-voltage part includes a high-voltage corona cover 1 made of copper, a high-voltage copper electrode rod 2, a high-voltage conduit 3 made of polytetrafluoroethylene, a gasket 8 made of polytetrafluoroethylene, and a high-voltage needle made of copper. Electrode / column electrode / ball electrode 10;

[0075] The sealed tank part includes a sealed tank body 8 made of stainless steel, a sealed cover 6 made of stainless steel, a sealing gasket 7 made of polytetrafluoroethylene, a vent valve 9 made of stainless steel, and a fastening screw 4 made of stainless steel The conduit fastening screw 5 made of...

Embodiment 3

[0094]The difference between this embodiment and embodiment 2 only lies in:

[0095] Using the invention, a corona discharge defect model electrothermal combined aging and partial discharge test is carried out. Select 25# ordinary transformer oil and 1mm thick ordinary insulating cardboard as test materials, and cut the cardboard according to the diameter of 80mm. Pretreat the oil and paper according to the aforementioned method, place the cardboard on the low-voltage plate electrode 13, and adjust the distance between the needle electrode and the cardboard to 1mm, as Figure 5 shown. Cover the sealing cover 6, tighten the fastening screw 4, use the vent valve 9 to evacuate the device to 50Pa, feed nitrogen, then put the whole device into a constant temperature oil tank for oil bath, set the oil bath temperature to 90 degrees. The initial discharge voltage of corona discharge is 12kV, then keep it at 18kV for 10min, collect 2000 power frequency cycles after the discharge is ...

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Abstract

The invention provides a transformer paper oil insulation experiment device integrated with electric heating combination ageing and partial discharge, and provides a corresponding experiment method. The experiment device comprises a high voltage portion, a low voltage portion and a sealing tank portion. The device can provide a platform of electric heating combination ageing and partial discharge experiments for a transformer paper oil insulation defect model, and can provide experiments of corona discharge, creeping discharge and air-gap discharge models in oil. The device has good air-tight performance, and can be isolated from external air and other influences. The whole system self cannot produce partial discharge, and the device cannot produce rust and other impurities in the partial discharge, can guarantee reliability of the partial discharge, and is simple in structure, convenient to operate, and capable of achieving good test effects.

Description

technical field [0001] The invention relates to the field of on-line monitoring and fault diagnosis of electrical equipment insulation, in particular to a test device and test method for the integration of transformer oil-paper insulation, electric heating, aging and partial discharge integration. Background technique [0002] Serious accidents of transformers will interrupt power supply and cause huge economic losses. Transformer failures caused by internal insulation problems occupy an important part. Transformer oil and oil-impregnated paper insulation are the main components of the transformer's internal insulation. During long-term operation, they are affected by electrical, thermal, mechanical and chemical factors and will age, causing the insulation performance of the transformer to decline, and even cause the main insulation of the transformer to fail. Longitudinal insulation failure. [0003] In order to study the aging law of transformer oil-paper insulation syste...

Claims

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Application Information

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IPC IPC(8): G01R31/16
Inventor 杨雁廖瑞金汪可吴高林郭超陈超肖前波段炼陈伟
Owner STATE GRID CHONGQING ELECTRIC POWER CO ELECTRIC POWER RES INST
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