Целью данной работы является разработка и исследование трансформатора для стыковой сварки в режиме вспышки на средней частоте. Мы исследуем влияние индуктивности рассеяния на время переходного процесса сварочного тока инверторного аппарата с использованием пакета Microcap и скин-эффект в среднечастотном трансформаторе Bosch PSG 3050.10A с помощью метода 2D конечных элементов. Высокий скин-эффект наблюдался в первичной обмотке. Для уменьшения скин-эффекта были использованы три метода. Изменение положения чередования первичной и вторичной обмоток уменьшило потери на 20,6%, уменьшение характерного размера провода первичной обмотки уменьшило потери на 6,5%, а увеличение количества секций первичной обмотки уменьшило потери на 32% по сравнению с PSG 3050.10A. Таким образом, предложена новая конструкция трансформатора, в котором скин-эффект меньше, чем в PSG 3050.10A на 44,8%.

This study aims at development and research of a medium frequency flash butt welding transformer. We investigate the influence of leakage inductance on the transient time of the welding current of the invertor machine using Microcap package and skin effect in Bosch PSG 3050.10A medium-frequency transformer by using 2D finite element method. High skin effect was observed in the primary winding. To reduce the skin effect, three methods were used. Changing the position of interleaving primary and secondary winding which reduced the losses by 20,6%, reducing the characteristic size of primary winding wire reduced the losses by 6,5% and increasing the number of primary winding sections decreased losses by 32% compared to PSG 3050.10A. Therefore, a new design transformer has been proposed in which the skin effect is less than in PSG 3050.10A by 44,8%.

• PETER THE GREAT ST.PETERSBURG POLYTECHNIC UNIVERSI
• Institute of Energy Approved by"Electrical Enginee
• CHAPTER 1: PROBLEMS OF DEVELOPMENT OF MEDIUM FREQU
  • 1.1 Brief description of flash butt welding system
• 1.1.1.Parameters in the flash butt welding
• 1.1.2.Equipment of flash butt welding
  • 1.2.Electrical circuits of medium frequency flash butt
• 1.2.1.Alternating current welding machines
• 1.2.2.CD Resistance welding machine
• 1.2.3.DC resistance welding machine
  • 1.2.4.DC Inverter machine
  • 1.3.Electromagnetic process in output rectifier circui
  • 1.4.Designs of transformers for flash butt welding
  • 1.5.Research Goals and Objectives
• CHAPTER 2: METHOD FOR CALCULATING FLASH BUTT WELDI
  • 2.1. Input data for the calculation
  • 2.2. Method for calculating the electromagnetic of
  • 2.3.Calculation of short-circuit resistance of welding
  • 2.4.Calculation of short-circuit resistance at high fr
• CHAPTER 3. RESEARCH OF SHORT CIRCUIT RESISTANCE OF
  • 3.1. Electric circuit of the rail welding machine
  • 3.2. Structure of the rail welding machine transf
  • 3.3 Calculation and measurement of short-circuit r
    • 3.3.1 Results of calculation of losses and short-c
  • 3.4. Skin effect analysis in PSG 3050.10A transfo
• CHAPTER 4: DEVELOPMENT OF AN IMPROVED DESIGN RAIL
  • 4.1. Description of the new design transformer
    • 4.1.1 Improved alteration of the primary and secon
    • 4.1.2 With reduced size of the copper disc of the
    • 4.1.3 Increased number of primary winding sections
  • 4.2 Initial data for the calculation
  • 4.3 Calculation of the main structural dimensions
  • 4.4 Calculation of the short circuit resistance of
  • 4.5 Transformer skin effect analysis and compariso
• CONCLUSION