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A real-time analog measurement device for thermal aging of transformers and its application

A measuring device and real-time simulation technology, applied in the direction of measuring devices, measuring electricity, measuring electrical variables, etc., can solve problems such as hidden dangers in operation, few data bases, and changes in estimated results, so as to achieve no impact on operation reliability, save investment, direct effect

Active Publication Date: 2018-05-22
SHANGHAI MUNICIPAL ELECTRIC POWER CO +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 tests that cannot accompany the entire life cycle of the transformer

Method used

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  • A real-time analog measurement device for thermal aging of transformers and its application
  • A real-time analog measurement device for thermal aging of transformers and its application
  • A real-time analog measurement device for thermal aging of transformers and its application

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Embodiment 1

[0040] A real-time analog measurement device for thermal aging of transformers, such as figure 1 As shown, the measuring device is connected with the transformer 2, including the housing 1, and the transformer 2 includes the transformer oil tank 22, and the housing 1 is connected with the transformer oil tank 22, and the inside is filled with insulating oil. The device also includes a hot spot temperature rise simulation unit and an insulating paper aging simulation unit both arranged in the casing 1, the input end of the hot spot temperature rise simulation unit is connected to the transformer 2, and the input end is connected to the insulating paper aging simulation unit;

[0041] When working, the temperature of the casing 1 is consistent with the temperature of the top layer of oil in the transformer oil tank 22, and then the temperature of the insulating oil in the measuring device is consistent with the temperature of the top layer of the transformer oil tank 22. The hot ...

Embodiment 2

[0056] The similarities between this embodiment and the first embodiment will not be described, and only the differences will be described.

[0057] Such as figure 2 As shown, the significant difference between this embodiment and Embodiment 1 is that the measurement device in this embodiment also includes an oil temperature control unit 4, and the oil temperature control unit includes a heater 42, a controller 41 and a device for collecting the temperature of the casing 1. Shell temperature sensor 43, the input end of controller 41 is respectively connected with the output end of shell temperature sensor 43 and the existing oil temperature sensor of transformer, the output end is connected with the input end of heater 42, the output end of heater 42 and shell temperature The input ends of the sensors 43 are all connected to the casing 1 .

[0058] The controller 41 collects the temperature of the casing 1 of the measuring device and the oil temperature of the transformer in...

Embodiment 3

[0060] The similarities between this embodiment and the first embodiment will not be described, and only the differences will be described.

[0061] The significant difference between this embodiment and Embodiment 1 is that in this embodiment, the insulating paper samples 3 of the insulating paper aging simulation unit are all horizontally wound around the temperature rise simulation resistance R x On the other hand, this setting can make the insulating paper sample more fully heated, and the simulation effect is more realistic.

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Abstract

The invention relates to a transformer heat aging real-time analog measuring device and its application, wherein the measuring device is connected with the transformer and includes a casing, the transformer includes a transformer oil tank, the casing is connected with the transformer oil tank, and the inside is filled with insulating oil, and the measuring device also includes an equalizer The hot spot temperature rise simulation unit and the insulating paper aging simulation unit are installed in the casing. The input end of the hot spot temperature rise simulation unit is connected to the transformer, and the output end is thermally connected to the insulation paper aging simulation unit; The hot spot temperature rise simulation unit simulates the hot spot temperature rise in the transformer in real time, thereby simulating the operating state of the transformer in real time in the measuring device, and then realizes the insulation paper aging simulation unit to simulate the thermal aging state of the transformer. 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 transformer thermal aging real-time analog 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 processing on the resul...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/00G01N33/34
Inventor 傅晨钊李贤宁胡正勇陆启宇林敏
Owner SHANGHAI MUNICIPAL ELECTRIC POWER CO
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