Force Distribution And State Analysis Of Transformer Winding Caused By Electromotive Force

As a key part in the safe operation of the power system,transformer plays an important role. It is not only able to convert the voltage to the voltage level of circuit branch,and also could connect the branch structure to the network system. In order to avoid the change of transformer structure caused deformation problems and reduce the impact on the network safety of the transformer,select the stress as the characteristic parameter of transformer structure analysis and research.and also select the transformer which made of Yunnan Tongbian Electric Appliance Co.Ltd.S13-12500/35 type oil immersed no excitation voltage regulating voltage power as the research object.The contents of the article are as follows:(1) The purpose and background of the research have been given. Moreover, the significance of the deformations of winding and core as well as the status of the study, the structure and the force analysis of the winding and core of the transformer are shown. In particular,discusses the forces of winding and winding electric power force under short circuit conditions.(2) Establish a 35kV oil-immersed transformers stress simulation model,on the basis of relevant data select from S13-1250035-type oil-immersed power transformers without excitation voltage regulator produced by Yunnan Changed Electric device corporation,creating 35kV transformers stress field model,using PTC Cero to complete the modeling and drawing work of transformer iron core and windings. Consider one-way unidirectional data transfer as the main form of coupling. Through the basic simulation assumptions,material type and property settings,type and simulation model,data importing and model meshing and model boundary definitions and constraints to construct the model of the transformer.Analysis the simulation of the stress distribution of 35kV oil-immersed transformers work under normal operation and short circuit conditions respectively. By changing the load resistance of the high voltage winding to adjust short-circuit or the load running situation of the transformer,then importing the external circuit load into the model data,analyze forces and deformation of the winding and core in horizontal and vertical direction, when the transformer under the normal operating conditions and short-circuit,the correctness of the model structure of transformer is verified by the analysis of the stress field, we can draw the size of the transverse longitudinal force, position and direction, and the deformation location and size of transformer winding and iron core structure.This is the focus analysis of 35kV oil-immersed transformers structural stress distribution and which provide a theoretical basis for the later force sensor installation and structure stress monitoring.