A hot spot calculation and location method for a lightweight vehicle-mounted traction transformer
A traction transformer and positioning method technology, applied in the direction of calculation, measurement of heat, measurement of electrical variables, etc., can solve the problem of huge consumption of time and computer resources, reduce the time and computer resources consumed by calculation, reduce the consumption of manpower and material resources, Modeling simple and fast effects
Active Publication Date: 2021-09-24
SOUTHWEST JIAOTONG UNIV
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Problems solved by technology
The CFD method is a common method for calculating the internal temperature of a transformer. It has high calculation accuracy and can provide rich detailed flow and heat transfer data, but it consumes a lot of time and computer resources, which makes the CFD method require a lot of trials in the design of transformers. Computational occasions have certain limitations
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[0047] The present invention will be further described below in conjunction with the drawings and specific implementation process. It should be emphasized that the specific implementation cases described here are only used to explain the present invention, and do not limit the scope of the inventive concept and the claims thereof.
[0048] The first step is to establish an axisymmetric two-dimensional model of a lightweight vehicle-mounted traction transformer
[0049] Obtain the structural parameters of a lightweight vehicle-mounted traction transformer to be analyzed (see figure 2 ), with a total of two layers of windings and 168 turns of conductors. Preliminary treatment is carried out according to its characteristics: delete winding outlet terminals, clamps, stays and other structures that have little influence on temperature distribution, and simplify the cooling air duct to two walls at the same time or Annulus pipes with constant heat flow are independent, and finally...
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The invention discloses a hot spot calculation and positioning method for a lightweight vehicle-mounted traction transformer, comprising the following steps: establishing an axisymmetric two-dimensional model of a lightweight vehicle-mounted traction transformer, arranging temperature monitoring nodes, calculating the thermal resistance of each part, and allocating winding temperature nodes Heating power, solving the temperature value of the winding temperature node, and obtaining the temperature and position of the hot spot. The beneficial effect of the present invention is that: compared with the CFD method which is cumbersome in modeling and consumes a large amount of computing resources and time, the present invention can realize the efficient and fast calculation of the temperature and position of the hot spot of the lightweight vehicle traction transformer, and reduce the consumption of manpower and material resources in the design process , to provide a new means for the optimization of the overall structure of the lightweight vehicle traction transformer and the improvement of thermal characteristics.
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 calculating and locating a hot spot of a lightweight vehicle-mounted traction transformer. Background technique [0002] The internal temperature of a transformer in operation will rise under the action of winding copper loss and iron loss, and the position with the highest temperature is called a hot spot. The life of a transformer can be equal to the life of its insulation to some extent, and the temperature of the hot spot is an important factor affecting the life of the insulation, so the temperature and position of the hot spot of the transformer must be accurately known. [0003] Lightweight on-board traction transformers are much lighter than oil-immersed on-board traction transformers due to the cancellation of components such as fuel tanks and insulating oil, which contribute to the further improvement of EMU perform...
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IPC IPC(8): G01R31/12G01K13/00G06F30/18G06F119/08
CPCG01K13/00G01R31/1227G06F30/18G06F2119/08
Inventor 袁帅周利军勾小凤
Owner SOUTHWEST JIAOTONG UNIV