Accurate and simple transformer oil acid value detection method

Abstract

The invention relates to an accurate and simple transformer oil acid value detection method. The method comprises the steps of: (1) oil sample detection, (2) blank solvent detection, and (3) calculation. In the step (1), 3.0-4.0g of transformer oil requiring detection is accurately weighed; an extractant isopropyl alcohol is added to the sample; the mixture is well mixed by shaking; an alkali blue 6B indicating agent is dropped into the mixture, such that a mixed solution is obtained; 0.05mol / L of a KOH ethanol solution is used for titration, until the color of the solution turns to light red. In the step (2), the extractant with a volume same as that used in the step (1) is weighed; the alkali blue 6B indicating agent is dropped into the extractant, such that a mixed solution is obtained; 0.05mol / L of a KOH ethanol solution is used for titration, until the color of the solution turns to light red, such that the titration reaches an end. In the step (3), the calculation is carried out according to the formula of: c(mgKOH / g)=(V-V0)*c(KOH)*M(KOH) / m. The method provided by the invention is simple and fast. With the method, heating and refluxing are not needed, such that working efficiency is improved. Twice titration is changed into once titration, such that the operation processes are simplified, and operation errors of the system are reduced.

Description

technical field [0001] The invention relates to the quality detection of industrial oil products, in particular to a detection method for the acid value of transformer oil. Compared with the traditional method, the method is simple and accurate. Background technique [0002] Transformer oil is an important mineral liquid insulating medium in the power system, which mainly plays the role of insulation, heat dissipation and cooling, and arc extinguishing. They are like the blood in the machine, and their quality directly affects the safe and economical operation of hair and power supply equipment. Transformer oil works for a long time in the state of oxygen, heat and strong electric field, and it will gradually age during operation, which will increase the acidic substances in the oil. The acidic substances in the transformer oil increase the conductivity of the oil, reduce the insulation performance of the oil, and at the same time promote the aging of solid fiber insulatio...

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Problems solved by technology

[0009] Obviously, there are obvious deficiencies in the above operation process: the solvent treatment process needs to be heated and refluxed for 5 minutes, and the sample preparation process also needs to be heated and refluxed for 5 minutes. The experimental device is complicated, the experiment takes a long time and consumes energy; Carbon dioxide is easy to intrude into the test solution during the titration process, resulting in high measurement results

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