An Accurate Calculation Method for Internal Temperature Field of Oil-immersed Transformer
An oil-immersed transformer, internal temperature technology, applied in the direction of calculation, instrument, special data processing application, etc., can solve the problem of transformer design temperature calculation obstacle, affecting the stable operation of the transformer, etc.
Active Publication Date: 2017-05-10
STATE GRID HEBEI ENERGY TECH SERVICE CO LTD
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Problems solved by technology
The calculation results show that both methods have certain errors, which constitute an obstacle to the design of the transformer and the calculation of the temperature of the transformer in actual operation, and affect the stable operation of the transformer
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[0023] Attached below figure 1 The present invention will be described in detail with specific embodiments.
[0024] The present invention is an accurate calculation method for the internal temperature field of an oil-immersed transformer, which belongs to a mixed calculation method based on improved finite element and finite volume, and is specifically implemented according to the following steps:
[0025] Step 1: Calculate the total internal loss of the transformer according to the parameters and load of the transformer, that is, the no-load loss of the iron core and the load loss of the winding, and then use the results of the no-load loss and load loss to calculate the heat generation of the winding and iron core respectively , and then divided by the volumes of the iron core and winding, respectively, to calculate the heat generation rate per unit volume of the iron core and winding;
[0026] Step 2: Based on the size and structure of the actual transformer, establish a ...
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The invention discloses a method for accurately calculating a temperature field in an oil-immersed transformer. According to the method, a 3D physical model which completely corresponds to a real transformer in size and structure is built, scientific mesh generation is carried out on the physical model according to different characteristics of calculation methods, a finite volume method and a finite element method are combined for calculation, in other words, the finite volume method is used for calculating metal heat conduction of a winding and iron core portion and heat transfer in which fluid participates, and the accurate 3D calculation result of the temperature field in the oil-immersed transformer can be obtained; not only the temperature field of a winding or an iron core but also the temperature field of oil flow in the transformer, the temperature field of cooling fins and the temperature field of a transformer box can be accurately calculated, and the method has important and comprehensive referential significance in both design of transformers and actual operation of the transformers.
Description
technical field [0001] The invention relates to a calculation method for the internal temperature field of an oil-immersed transformer, which belongs to a mixed calculation method based on an improved finite element method and a finite volume method, and is mainly used in the field of transformer design and on-line monitoring. Background technique [0002] Large-scale oil-immersed power transformers are the core equipment of the power system, and their operating conditions are related to the stability of the power grid and whether thousands of households can use electricity safely and reliably. The failure of the transformer is often caused by its insulation aging. In actual operation, it is of great significance to accurately calculate the temperature field of the transformer, especially the hot spot temperature of the winding, to prolong the life of the transformer and stabilize the operation of the power grid. [0003] The internal structure of oil-immersed transformers ...
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IPC IPC(8): G06F19/00G06F17/50
Inventor 刘宏亮潘瑾王永强高树国赵军梁博渊王卓然
Owner STATE GRID HEBEI ENERGY TECH SERVICE CO LTD