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Method for judging proportion of residual mineral oil after refilling transformer with soybean-based natural ester

A mineral oil, refilling technology, applied in the direction of instruments, scientific instruments, flow characteristics, etc., can solve the problem of the relationship between the flash point of the mixed oil and the proportion of mineral oil, and achieve the effect of reducing the impact

Inactive Publication Date: 2020-06-19
STATE GRID SHAANXI ELECTRIC POWER +3
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Problems solved by technology

However, the flash point is greatly affected by environmental factors, and it is difficult to construct the relationship between the flash point of mixed oil and the proportion of mineral oil

Method used

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  • Method for judging proportion of residual mineral oil after refilling transformer with soybean-based natural ester
  • Method for judging proportion of residual mineral oil after refilling transformer with soybean-based natural ester
  • Method for judging proportion of residual mineral oil after refilling transformer with soybean-based natural ester

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Embodiment

[0050] Since the transformer oil may be invaded by impurities, moisture and oxygen in the air during the transfer, refilling and sampling process, and these substances will affect the performance of the insulating oil to a certain extent, so before the experiment, all insulating materials involved in the experiment should be checked. Oil is filtered and degassed and degassed pretreatment:

[0051] (1) Filtration: Refer to the schematic diagram of the filtering platform used figure 2 . The platform uses a Buchner ceramic funnel with an inner diameter of 125 mm, on which there are No. 5 qualitative filter paper (125 mm in diameter, 2.5 μm in diameter) and No. 1820 glass fiber filter paper (125 mm in diameter, 1.6 μm in diameter) placed on it. The funnel is placed on the suction filter bottle, and the upper suction filter port is connected with a vacuum pump to help and accelerate the passage of insulating oil through the filter paper. Under the internal vacuum environment, po...

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Abstract

The invention discloses a method for judging the proportion of residual mineral oil after refilling a transformer with soybean-based natural ester. The method comprises the following steps: performingsoybean-based natural ester refilling on a mineral oil transformer; sampling mixed oil, then carrying out filtering and water and gas removal pretreatment; ; testing the viscosity of the mixed oil pretreated at a temperature of 40 DEG C according to related standards; calculating the proportion of mineral oil in the refilled mixed oil according to a regression equation determined through experimental data fitting; and evaluating the refilled mixed insulating oil. The proportion of the refilled mineral oil generally does not exceed 10%, and the linear relationship between the viscosity of themixed oil and the proportion of the mineral oil is very obvious in an interval of 0-10% of the proportion of the mineral oil, so that an equation model of the viscosity of the mixed oil of the soybean-based natural ester and the mineral oil and the proportion of the mineral oil can be accurately obtained. In addition, the physical and chemical properties of the viscosity of the mixed oil are low in sensitivity to moisture, so that the influence of environmental factors on a measurement result is effectively reduced.

Description

technical field [0001] The invention belongs to the field of refilling transformer oil, and relates to a method for judging the proportion of residual mineral oil after refilling a transformer with a soybean-based natural ester. Background technique [0002] Although mineral oil is a commonly used transformer oil, the reasons for refilling are as follows: First, mineral insulating oil is a flammable liquid, its ignition point is usually 170 ° C, flash point is 140 ° C, natural ester insulating oil It is a new type of environmentally friendly liquid insulating medium. Its ignition point and flash point are both greater than 300 ℃, which is much higher than that of mineral oil. Refilling with natural ester will greatly improve fire safety. Second, mineral oil has a low biodegradation rate. Once a leak occurs, it will cause serious pollution to water sources and land. Natural esters are officially classified as easily biodegradable and are considered to be more environmentally ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/28G01N11/10G01N25/52
CPCG01N33/28G01N11/10G01N25/52
Inventor 魏宾任双赞王鸿徐阳马耀翔王远杨磊朱红梅单玉涛刘晶吴昊王宝乐
Owner STATE GRID SHAANXI ELECTRIC POWER
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