Method for evaluating antioxidant stability of vegetable insulating oil for transformer
A plant insulating oil, anti-oxidation technology, applied in the direction of instruments, scientific instruments, measuring devices, etc., can solve problems such as the inability to ensure the safe operation of insulating oil, the anti-oxidative stability of a single insulating oil for research purposes, etc.
Pending Publication Date: 2020-08-25
CHINA THREE GORGES UNIV +1
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Problems solved by technology
[0003] At present, the oxidation process of insulating oil is mainly delayed by adding antioxidants such as butylated hydroxytoluene (BHT), tea polyphenols, rosemary, etc. at home and abroad, but the research purpose is mostly to improve the anti-oxidation stability of insulating oil. It is impossible to ensure that the improved insulating oil can run safely in the transformer, so it is urgent to find a method that is really suitable for systematically evaluating the oxidation stability of vegetable insulating oil for transformers
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[0039] A method for evaluating the antioxidant stability of vegetable insulating oil for transformers, including the following steps:
[0040] Step 1: Prepare three anti-oxidant BHT with addition amounts of 0.02%, 0.2%, and 0.4% respectively, and the three concentration gradients increase according to a certain function law. The antioxidant BHT powder was mixed in absolute ethanol for 2 hours of ultrasonic vibration, and then added to 100g of vegetable insulating oil after 48 hours of vacuum drying, so as to obtain 3 samples required for the experiment, and prepare one without adding any The 100g vegetable insulating oil of the reagent was used as a blank sample; 3 samples with different dosages and a blank sample were prepared in the same way in addition to 3 groups, and the 4 groups of samples were used for the comparison of the aging time gradient experiment; Step 2: The prepared 4 groups The samples are put into the aging box for 7d, 14d, 21d, 28d heat aging simultaneously; t...
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The invention relates to a method for evaluating the antioxidant stability of vegetable insulating oil for a transformer. The method comprises the following steps of: weighing a plurality of groups ofantioxidant reagents with different doses, and respectively adding the antioxidant reagents into the vegetable insulating oil with the same mass to prepare experimental samples with different concentrations; putting the prepared experimental samples with different concentrations into an aging box and aging at the same time; selecting a plurality of proper aging time nodes, measuring the chemicalcharacteristic quantity and the electrical characteristic quantity, and observing and analyzing the change rule of the chemical characteristic quantity and the electrical characteristic quantity of the experimental sample; carrying out FDS measurement, and analyzing the change rule of the dielectric property of the experimental sample; performing molecular simulation analysis, and analyzing the reaction mechanism of the antioxidant to the vegetable insulating oil. The method disclosed by the invention provides an important reference basis for researching the antioxidant stability of the vegetable oil and evaluating and researching the antioxidant stability of the vegetable oil transformer in reality.
Description
Technical field [0001] The invention relates to the technical field of research on the improvement of the oxidation stability of vegetable insulating oil, in particular to a method for evaluating the oxidation stability of vegetable insulating oil for transformers. Background technique [0002] As an important insulating part of oil-immersed transformers, oil-paper insulation system is particularly important for its own insulation strength. The characteristic quantities currently used to characterize the insulation strength of oil-paper insulation systems include chemical characteristic quantities, such as acid value, moisture, and furfural in the oil, and electrical characteristic quantities, such as dielectric loss factor and permittivity. In addition, insulating oil is an important part of the oil-paper insulation system. When it is operated for a long time in the transformer, it will be affected by heat, light and other factors, and gradually contact with oxygen to produce ac...
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IPC IPC(8): G01N33/28G01D21/02
CPCG01N33/2805G01N33/2835G01N33/2847G01N33/2876G01D21/02
Inventor 张涛韩建玮王铄杨文雁杜政波冯宁陈婵
Owner CHINA THREE GORGES UNIV