An Analysis and Improvement Method of Preventing Local Overheating of Double Pancake Windings
A pie-shaped winding and local overheating technology, which is applied in the direction of transformer/inductor coil/winding/connection, transformer/inductor parts, instruments, etc., can solve the problem of low voltage winding voltage, calculation of current distribution, and inability to improve according to current distribution Problems such as double cake windings can prevent local overheating and prolong life
Active Publication Date: 2018-12-14
BAODING TIANWEI GROUP TEBIAN ELECTRIC
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Problems solved by technology
[0002] In rectifier transformers and electric furnace transformers, due to the low voltage and high current of the low-voltage windings, it is necessary to use multiple parallel connections to achieve the purpose. The most commonly used is the multi-channel parallel double-cake winding structure. This structure will cause local overheating
The traditional leakage field method cannot accurately calculate the current distribution, and thus cannot improve the structure of the double pie winding according to the current distribution to prevent local overheating of the double pie winding
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[0026] In order to make the object, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below with reference to the accompanying drawings and in combination with embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0027] Such as figure 1 As described, the current distribution of the double pie winding is analyzed by the finite element method as follows.
[0028] 1. Build a computational model. Establish a two-dimensional axisymmetric model according to the structural size of the transformer body. The schematic diagram of the model structure is shown in figure 2 As shown, it includes iron core 1, high-voltage winding 2, low-voltage winding 3, oil tank 4 and air bag 5 required by software simulation. Wherein, when building the model, the low-voltage winding 3 located on the outside is ...
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The invention discloses analysis and improvement methods for preventing local overheating of a double pancake winding, and relates to the technical field of transformer manufacturing. The analysis method comprises the steps of simulating the double pancake winding by using a finite element method to obtain a current distribution condition; improving the structure of the double pancake winding through current distribution and calculating the current distribution; and judging whether the local overheating phenomenon of the double pancake winding is improved or not through comparing the current distribution conditions before and after improvement. The improvement method comprises the steps of increasing a conductor section of one parallel branch at each of the head end and the tail end of a low-voltage winding; reducing the conductor sections of two adjacent parallel branches at each of the head end and the tail end of the low-voltage winding; and increasing the axial height of the low-voltage winding. The analysis method is simple and convenient; the calculation result is accurate; the structure of the double pancake winding is improved through the analysis result; local overheating is prevented; and the service life of a transformer is prolonged.
Description
technical field [0001] The invention relates to the technical field of transformer manufacturing, in particular to an analysis and improvement method for preventing local overheating of double pie windings. Background technique [0002] In rectifier transformers and electric furnace transformers, due to the low voltage and high current of the low-voltage windings, it is necessary to use multiple parallel connections to achieve the purpose. The most commonly used is the multi-channel parallel double-cake winding structure. This structure will cause Localized overheating. The traditional leakage field method cannot accurately calculate the current distribution, and thus cannot improve the structure of the double pie winding according to the current distribution to prevent local overheating of the double pie winding. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide an analysis and improvement method for preventing l...
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IPC IPC(8): H01F27/08H01F27/28H01F41/04G06F17/50
CPCG06F30/23H01F27/2823H01F27/2876H01F41/04
Inventor 张亚杰刘新颜刘洪文张立明张庆波孙国刚
Owner BAODING TIANWEI GROUP TEBIAN ELECTRIC