A real-time analog measurement device for thermal aging of a dual-cavity transformer and its application

Abstract

The invention relates to a dual-cavity transformer thermal aging real-time simulation measurement device and its application, wherein the measurement device is connected with the transformer, including a casing, the transformer includes a transformer oil tank, the casing is connected to the top of the transformer oil tank, and the inside is filled with insulating oil. There is a baffle for dividing the shell into two chambers, one chamber is equipped with a hot spot temperature rise simulation unit and the first insulation paper aging simulation unit, and the other chamber is equipped with an average temperature rise simulation unit and the second The input terminals of the insulating paper aging simulation unit, the hot spot temperature rise simulation unit and the average temperature rise simulation unit are all connected to the transformer, and the output terminals are respectively thermally connected to the first insulation paper aging simulation unit and the second insulation paper aging simulation unit. Compared with the prior art, the invention has the advantages of accurate measurement without destroying the transformer mechanism and the like.

Description

technical field [0001] The invention relates to a transformer thermal aging measurement technology, in particular to a dual-cavity transformer thermal aging real-time simulation measurement device and its application. Background technique [0002] Oil-immersed power transformer insulation adopts oil-paper (board) insulation structure, and most of the solid insulation is composed of cellulose, and its aging is significantly affected by temperature, referred to as thermal aging. At present, thermal aging detection methods can be divided into: [0003] (1) Aging product detection method [0004] Transformer insulation aging will generate CO and CO2; furfural; acetone and other decomposition products. The aging degree can be estimated by detecting the content and changes of these components during operation. Although this method is simple and easy, it cannot distinguish between normal aging and abnormal defects. , it is impossible to control the influence of oil sample process...

AI Technical Summary

Problems solved by technology

The main disadvantages of this method are: 1) It is impossible to distinguish the source of moisture content in the insulating paper, so moisture, leakage and other defects will significantly change the estimation results; Selection and individual transformer equipment under different operating conditions are used for more accurate estimation; 3) This type of method can only reflect the average aging degree of the equipment, but cannot reflect the shortcomings of the equipment, which brings hidden dangers to the operation; 4) The power outage is required during the test, which affects reliability of grid operation

[0010] Sampling material testing is currently the most accurate method of aging assessment. It obtains the direct result of aging by collecting paper samples inside the transformer and then testing the degree of polymerization. Paper pattern, that is, the short board that cannot estimate aging; once disintegrated, the meaning of aging assessment will disappear

[0011] For example, Chinese patent CN 101408578B discloses a test device and test method for accelerated aging of transformer oil-paper insulation. The temperature control device for the temperature in the box. The vibration device can drive the transformer oil-paper insulation simulation device to vibrate. The transformer oil-paper insulation simulation device is electrically connected to the high-voltage power supply. Therefore, the temperature rise of the hot spot in the transformer is not considered, and the simulation of the accelerated aging process cannot simulate the aging of the transformer in real time, so the aging test is not accurate enough; the second is that the test device and the aging test are not Considering the age of the transformer, the test device and the test that cannot accompany the entire life cycle of the transformer; the third is that the simulation test of the thermal aging state and the average thermal aging state of the hot spot of the transformer cannot be realized at the same time, and the measurement surface is not perfect

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