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Method for monitoring top oil temperature of oil-immersed transformer

A technology for oil-immersed transformers and top layer oil temperature, which is applied in the direction of instruments, thermometers, measuring electricity, etc., can solve the problems of transformer overload operation, deviation, etc., and achieve comprehensive, accurate and universal monitoring

Active Publication Date: 2018-12-21
SOUTHWEST JIAOTONG UNIV
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Problems solved by technology

At present, the general method for determining the internal temperature rise of the transformer, including the temperature rise of the top layer oil and the temperature rise of hot spots, is based on the "two-stage" temperature rise calculation formula in IEEE and IEC standards. However, with the increase of power load, transformers often face In the case of overload operation, this will lead to a certain deviation when the oil index value recommended by the standard is used for the calculation of the top oil temperature

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  • Method for monitoring top oil temperature of oil-immersed transformer
  • Method for monitoring top oil temperature of oil-immersed transformer
  • Method for monitoring top oil temperature of oil-immersed transformer

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Embodiment Construction

[0044] The present invention is further described below.

[0045] The first step is to obtain the known structure and physical parameters of the oil-immersed transformer:

[0046] Height difference Δh between hot and cold cores, winding height h w , radiator height h r , Winding vertical oil channel thermal hydraulic diameter D w , Radiator oil channel thermal hydraulic diameter D r , oil specific heat capacity c oil , air specific heat capacity c air , oil density ρ oil , air density ρ air , oil thermal expansion coefficient β oil , Winding along the drag coefficient f w , The drag coefficient f along the radiator r , the total heat transfer coefficient of the radiator U, the flow area of ​​the winding area A w , Radiator circulation area A r , Radiator effective heat dissipation area A R , temperature difference index λ, ambient temperature T amb .

[0047] The second step is to solve the unknown quantities to be determined, including: the oil flow volume flow ...

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Abstract

The invention discloses a method for monitoring the top oil temperature of an oil-immersed transformer. The method comprises: determining a corrected oil index, monitoring an ambient temperature and the actual load current of a winding in real time, monitoring a top oil temperature of an oil-immersed transformer in real time after oil index correction and the like. The method has the following beneficial effects: the oil index reflecting a relationship between a load rate and an oil temperature rise is parsed and calculated by using a global oil path thermal model based on momentum conservation and energy conservation and a double-logarithmic regression model to obtain an oil index correction value under a multi-times load and the oil index correction value is introduced into a top oil temperature calculation model; and compared with a reference value recommended by the standard, the calculation accuracy of the top oil temperature under the multi-times load is improved.

Description

technical field [0001] The invention relates to the field of electrical insulation on-line detection and fault diagnosis, in particular to a method for monitoring oil temperature at the top layer of an oil-immersed transformer. Background technique [0002] Oil-immersed transformer is the core equipment of the power system, and its efficient and safe operation plays a vital role in the operation and development of the power industry. The working life of a transformer depends on its internal insulation performance, and thermal aging is the main factor affecting the deterioration of its insulation performance, so the working life of a transformer is closely related to its internal temperature rise. At present, the general method of determining the internal temperature rise of the transformer, including the temperature rise of the top layer oil and the temperature rise of hot spots, is based on the "two-stage" temperature rise calculation formula in IEEE and IEC standards. Howe...

Claims

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Application Information

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IPC IPC(8): G01K13/00G01R31/12
CPCG01K13/00G01R31/1281
Inventor 郭蕾周利军黄林王健唐浩龙
Owner SOUTHWEST JIAOTONG UNIV
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