Analysis Of Leakage Magnetic Field And Temperature Field Of 800KVA Deep-sea Transformer

Transformers are the most important power equipment in the power grid to ensure the safe and reliable operation of the power system.As the demand for offshore oil production increases,the demand for electricity from offshore oil production is increasing,and transformers used in the deep sea have emerged.The leakage magnetic field and thermal performance of the transformer have great influence on the safe use of the transformer.Therefore,it is of great significance to study the leakage magnetic field and temperature field of the deep-sea transformer.This article takes the 800 KVA deep-sea transformer as the research object.First of all,the transformer Pro/E model is established.Using the symmetry of the transformer structure,a 2D half model is built using the ANSYS finite element calculation software to solve and analyze the magnetic field lines of the two-dimensional leakage magnetic field of the deep sea transformer in detail.The three-dimensional leakage magnetic field analysis was added,and under the premise of satisfying the analysis requirements,the three-dimensional analysis model was reasonably simplified,the distribution of three-dimensional magnetic flux distribution in the leakage magnetic field was obtained,and the accuracy of the two-dimensional leakage magnetic field solution was verified.Secondly,use ANSYS finite element calculation software to establish a two-dimensional half-dimension model,calculate the loss value of the windings,and obtain the specific distribution of winding losses,the losses in the core,low voltage inner winding,low voltage outer winding,high voltage inner winding The distribution of high voltage outer windings is analyzed.A three-dimensional model was established to solve the winding losses,and compared with the two-dimensional results,and to verify the accuracy of the two-dimensional loss solution results.Finally,on the basis of magnetic flux leakage analysis and loss solution,a finite element model for temperature field analysis of deep-sea transformers is established based on CFDesign software.Considering factors such as ambient temperature,seawater flow rate,marine environment,and transformer heat dissipation structure,twelve types of calculation conditions are set.The result of the winding loss analysis is the heat source input,the analysis parameters of the transformer temperature field are processed,and the boundary conditions and grids are added to solve the temperature field of the deep-sea transformer under different working conditions.The overall temperature,sampling point temperature and hot spot temperature are respectively The oil flow rate and oil density were analyzed to see if the transformer temperature rise satisfies the design requirements.The design and material selection parameters of the existing underwater transformers basically meet the design requirements.That is,the oil surface temperature rise is lower than 68 K,and the hot spot temperature rises.Less than 78 K.Comprehensive analysis summarizes the effects of ambient temperature,seawater flow rate,transformer heat sink housing on temperature,and transformer heat dissipation.The current structure and heat dissipation conditions of deep-sea transformers are studied,analyzed and evaluated.The performance of transformers is evaluated,and the factors affecting the thermal performance of transformers are summarized to guide the design,manufacture and use of deep-sea transformers.