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A simulation calculation method for temperature rise characteristics of transformer windings

A technology of transformer winding and simulation calculation, applied in the field of simulation, can solve the problems of ignoring the influence of temperature rise characteristics, unfavorable practical application, and many factors of heat transfer, etc.

Pending Publication Date: 2019-01-22
WUHAN NARI LIABILITY OF STATE GRID ELECTRIC POWER RES INST +2
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Problems solved by technology

[0003] However, since the calculation of the temperature rise of components such as transformer windings and oil flow is a multidisciplinary problem, and the structure of the transformer is complex, there are many factors affecting heat transfer, so it is difficult to calculate the temperature rise of each point inside the power transformer.
[0004] At present, most scholars in China use the hot spot temperature calculation method recommended by GB / T15164-94 "Oil-immersed Power Transformer Load Guidelines", and use the winding hot spot temperature of 140°C as a constraint to evaluate the temperature rise characteristics of the transformer. However, this method has the following Problems: 1) The influence of the flow field of transformer oil in the power transformer on the temperature rise characteristics is ignored; 2) When evaluating the temperature rise characteristics of the transformer, the temperature rise characteristics under dynamic loads cannot be evaluated, which is not conducive to practical application

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  • A simulation calculation method for temperature rise characteristics of transformer windings
  • A simulation calculation method for temperature rise characteristics of transformer windings
  • A simulation calculation method for temperature rise characteristics of transformer windings

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Embodiment 1

[0035] Such as figure 1 Shown is a simulation calculation method for the temperature rise characteristics of a transformer winding according to the present invention, including the following steps:

[0036] S1: Build a model: build a model in the finite element simulation software according to the actual size of the transformer's oil tank, high-voltage winding, low-voltage winding and iron core;

[0037] Specifically: in the process of building the model, select the single item analysis of the transformer, establish a two-dimensional axisymmetric model, set the core center as the symmetrical axis; set the winding parameters of the low-voltage side of the power transformer, the winding parameters of the high-voltage side, the oil channel parameters, the core parameters and The parameters of the oil tank; the heat source only considers the iron core and the high and low voltage windings; the temperature of the high and low voltage windings of the transformer along the circumfere...

Embodiment 2

[0061] The model used in this embodiment is a 35kV / 315kVA oil-immersed transformer. The transformer is simulated based on the simulation method of transformer temperature rise characteristics under dynamic load of ANSYS Fluent. The specific steps are as follows:

[0062] S1, build a model: build a model in finite element simulation software (ANSYS) according to the actual size of transformer oil tank, winding and iron core;

[0063] Specifically, in this embodiment, the height of the oil tank is set to 1070mm, and the width is 255mm; the height of the iron core is 840mm, and the width is 87.5mm; The gap width is 5mm; the height of the high-voltage winding is 378mm, and the width is 40mm; the width of the oil gap between the iron core and the low-voltage winding is 6.5mm, the width of the oil gap between the low-voltage and high-voltage winding is 20mm, and the width of the oil gap between the high-voltage winding and the tank wall is 75mm; The bottom of the fuel tank is 12mm, ...

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Abstract

The invention discloses a simulation calculation method for temperature rise characteristics of transformer windings, which is based on finite element method, fluid mechanics and computational heat transfer, and adopts ANSYS Fluent software to realize temperature rise of transformer windings. Based on the fluid-field coupling numerical model, a simulation method of temperature rise of oil-immersedpower transformer winding hot spots is proposed.

Description

technical field [0001] The invention relates to the field of simulation technology, in particular to a simulation calculation method for temperature rise characteristics of transformer windings. Background technique [0002] The power transformer is one of the important electrical equipment in power transmission, and its reliability plays a very important role in the safe operation of the power system. When the temperature rise of the power transformer winding exceeds the limit specified by the national standard, the oil-immersed paper insulation is in the range of 80 ° C to 140 ° C, and the insulation aging rate will double for every 6K increase in the hot spot temperature. Excessive temperature rise will cause the insulation material to age in advance, reduce the insulation performance, shorten the service life, and then affect the efficiency and normal operation of the power transformer. Therefore, it is necessary to quantitatively and accurately calculate the temperatur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F2119/08G06F30/23
Inventor 杨耀贤程林江翼王谦刘熊张施令
Owner WUHAN NARI LIABILITY OF STATE GRID ELECTRIC POWER RES INST
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