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An abnormal monitoring method for fan air volume of oil-immersed transformer based on oil index identification

An oil-immersed transformer, abnormal monitoring technology, applied in the direction of transformer/inductor cooling, transformer/inductor parts, mechanical parts testing, etc., can solve the problem that it is difficult to find latent faults of fans, and cannot realize fan status monitoring, etc. problems, to achieve early warning of faults and improve efficiency

Active Publication Date: 2022-04-08
CHINA UNIV OF MINING & TECH
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  • Claims
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AI Technical Summary

Problems solved by technology

[0003] At present, the research on the cooling system of oil-immersed transformers mainly focuses on the intelligent control of the cooling system, structural modification, structural optimization of the radiator, and improvement of cooling performance. There are few relevant literature reports on the fault identification of the external cooling fan of the transformer.
In addition, in engineering practice, the state detection method of transformer-based power equipment is mainly regular equipment maintenance, which cannot realize real-time and continuous state monitoring of the external fan of the transformer, and it is difficult to find the latent failure of the fan

Method used

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  • An abnormal monitoring method for fan air volume of oil-immersed transformer based on oil index identification
  • An abnormal monitoring method for fan air volume of oil-immersed transformer based on oil index identification
  • An abnormal monitoring method for fan air volume of oil-immersed transformer based on oil index identification

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Embodiment

[0088] Taking an oil-immersed transformer with a rated capacity of 30MVA and a rated voltage of 220kV as an example, its parameters are shown in Table 1 below. Physical parameters such as density, kinematic viscosity, and thermal conductivity of solids and fluids involved in the calculation of heat transfer coefficients As shown in Tables 2 and 3 below, Table 4 shows the design parameters of the heat sink. Since more than 90% of the heat is taken away by the convection heat dissipation between the heat sink and the air, only the heat transfer coefficient of the air side is considered in this embodiment. .

[0089] Table 1 Transformer parameters

[0090]

[0091]

[0092] Table 2 Physical parameters of heat sink

[0093]

[0094] Table 3 Physical parameters of fluid materials

[0095]

[0096] Table 4 Values ​​of radiator design parameters

[0097]

[0098] In the oil-immersed self-cooling (ONAN) mode calculation model, the heat transfer coefficient is calcula...

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Abstract

The invention discloses a method for monitoring the abnormal air volume of a fan in an oil-immersed transformer cooling system based on oil index identification. The method includes establishing the temperature rise of the oil-immersed transformer under two cooling modes: oil-immersed self-cooling and oil-immersed air cooling model, calculate the top layer oil temperature of the transformer, and compare the transformer oil index in the two modes, so as to obtain the characteristic quantity reflecting the state of the fan air volume. The monitoring method reflects the running state of the fan by monitoring the change trend of the transformer oil index in real time according to the on-site oil temperature data of the transformer. As an abnormal state monitoring method for fans in the cooling system, this method uses transformer oil temperature data to conduct real-time and continuous online monitoring of fan air volume conditions, which can make up for the shortcomings of existing regular manual detection methods for fans, and greatly improve the efficiency of early fan fault detection. and accuracy.

Description

technical field [0001] The invention relates to a method for monitoring abnormal air volume of an oil-immersed transformer fan based on oil index identification, which is used for monitoring the abnormal air volume of a fan in a cooling system of an oil-immersed transformer, and belongs to the technical field of online monitoring of power transformers. Background technique [0002] As the key equipment in the power system, the transformer's safe and stable operation plays a key role in the reliable transmission of electric energy. The rapid increase of power load makes the transformer face the potential risk of overload and winding hot spot temperature exceeding the limit, which in turn affects the winding insulation and service life of the transformer. In order to ensure that the temperature rise of the transformer is within the specified range, make it operate reliably for a long time, and ensure the normal operation of the transformer cooling system, its importance is sel...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F04D27/00G06F30/20G01K13/00G01M13/00H01F27/08H01F27/12G06F111/10G06F119/02G06F119/08
CPCF04D27/001F04D27/008G06F30/20G01K13/00G01M13/00H01F27/085H01F27/12G06F2111/10G06F2119/08G06F2119/02
Inventor 张建文左弯弯王冬伟王路伽刘康凯
Owner CHINA UNIV OF MINING & TECH
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