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A Method of Determining Winding Index of Traction Transformer

A traction transformer and winding technology, which is applied in the field of determining the winding index of a traction transformer, can solve problems such as wide variation range, increased calculation error, and steep amplitude change.

Active Publication Date: 2019-04-30
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 increases, the monitoring accuracy of the internal temperature of the traction transformer decreases

Method used

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  • A Method of Determining Winding Index of Traction Transformer
  • A Method of Determining Winding Index of Traction Transformer
  • A Method of Determining Winding Index of Traction Transformer

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Embodiment Construction

[0041] The present invention is further described below.

[0042] The first step is to obtain the known relevant structure and physical parameters of the traction transformer:

[0043] 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 Thermal hydraulic diameter of oil channel 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 , total heat transfer coefficient U of radiator, heat transfer coefficient u of winding surface w , Winding area circulation area A w , Radiator circulation area A r , Radiator effective heat dissipation area A R , the contact surface area A between the winding and the oil flow in the circumferential direction s , temperature difference index...

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Abstract

The invention discloses a method for determining the index of windings of a traction transformer. The method comprises the following steps of obtaining relevant physical property parameters of the traction transformer, utilizing a winding area thermal model for calculating the average temperature rise waiting fixed quantity of the windings, and utilizing a winding index analyzing model for conducting regression calculation on the index of the windings according to the average temperature rise, the load coefficient and other relevant data of the windings. Compared with a reference value recommended by the IEEE standard, the index, calculated by means of the method, of the windings is more suitable for quick estimation of hot-point temperature rise of the traction transformer under multi-fold overloads, and helps to more accurately explain the temperature rise change rule of the transformer at a board load interval.

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 determining the winding index of a traction transformer. Background technique [0002] As the core equipment of traction power supply system of high-speed railway, traction transformer plays a vital role in the operation and development of high-speed railway with its efficient and safe operation. 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 f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50G06F17/18
CPCG06F17/18G06F30/20
Inventor 周利军王健袁帅唐浩龙郭蕾
Owner SOUTHWEST JIAOTONG UNIV