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A method for determining oil index of traction transformer

A traction transformer and oil index technology, which is applied to instruments, electrical digital data processing, special data processing applications, etc., can solve problems such as large fluctuations, steep amplitude changes, and increased calculation errors

Active Publication Date: 2018-12-18
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For traction transformers, due to the special working conditions in train operation, the operating load of traction transformers has the characteristics of steep amplitude changes, wide ranges of changes, and large fluctuations, which will directly lead to calculation errors in the "two-stage" temperature rise model increase, the monitoring accuracy of traction transformer oil temperature decreases

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  • A method for determining oil index of traction transformer
  • A method for determining oil index of traction transformer
  • A method for determining oil index of traction transformer

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Embodiment Construction

[0039] The present invention is further described below.

[0040] The first step is to obtain the known relevant structure and physical parameters of the traction transformer:

[0041] 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 .

[0042] The second step is to solve the unknown quantities to be determined, including: the oil flow volume ...

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Abstract

The invention discloses a method for determining an oil index of a traction transformer, comprising the following steps: obtaining relevant structural and physical parameters of the traction transformer, calculating a waiting quantity of a top layer oil temperature rise by means of a global oil flow heat model, and performing regression calculation on the oil index according to relevant data suchas the temperature rise of the top layer oil and a load coefficient by using an oil index analytic model. Compared with the reference value recommended by the IEEE standard, the oil index calculated by the method of the invention is more suitable for rapid estimation of the temperature rise of the top layer oil of the traction transformer under multiple overloads, and is helpful for more accurateexplanation of the temperature rise change rule under a wide load range.

Description

technical field [0001] The invention relates to the field of electric insulation on-line detection and fault diagnosis, in particular to a method for determining the index of traction transformer oil. Background technique [0002] Traction transformer is the core equipment of high-speed railway traction power supply system, and its efficient and safe operation plays a vital role in the operation and development of high-speed railway. The working life of the traction transformer depends on the internal insulation performance, and thermal aging is the main factor affecting the deterioration of its insulation performance, so the working life of the traction transformer is closely related to its internal temperature rise. [0003] At present, the general method for determining the internal temperature rise of the transformer, including the temperature rise of the top oil and the temperature rise of hot spots, is based on the "two-stage" temperature rise calculation formula in th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/17G06F2119/08
Inventor 周利军唐浩龙王健王路伽黄林
Owner SOUTHWEST JIAOTONG UNIV