Method for accurately calculating temperature field in oil-immersed transformer

A technology for oil-immersed transformers and internal temperature, which is applied in calculations, instruments, and special data processing applications, and can solve problems affecting the stable operation of transformers and obstacles to the calculation of transformer design temperature

Active Publication Date: 2014-09-10
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

Method used

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  • Method for accurately calculating temperature field in oil-immersed transformer

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Embodiment Construction

[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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Abstract

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 involves a calculation method of an internal temperature field in the oil -soaked transformer. It is a hybrid calculation method based on the improved finite element and limited volume method. It is mainly used in the design and online monitoring field of transformer. Background technique [0002] Large -scale oil -immersed power transformers are the core equipment of the power system. The stability of the operation of the power grid is good or bad, and the stability of the power grid is safe and reliable.The failure of the transformer is often caused by its insulation and aging.In actual operation, the temperature field of the transformer accurately calculates the hotspot temperature of the transformer, especially the winding of the winding, is of great significance for the life of the extended transformer and the stable operation of the grid. [0003] The internal structure of the oil immersion transformer is complicated, and the mechanism o...

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Application Information

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Patent Type & Authority Applications(China)
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
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