Research On Risk Assessment System Of Transformer Based On Fault Case

In recent years,with the continuous development of the economy and the continuous improvement of people's living standards,the demand for electricity in all parts of our country is greatly increased.The power grid has entered a stage of rapid development.Under the background of the rapid development of power grid,it is essential to ensure the safe and reliable operation of power network,safe and reliable operation of power equipment is the first defense line of the entire power grid security.Transformer is one of the important equipments in the power grid,it is of great significance to ensure the safty and reliability of the whole power grid.It can identify all kinds of risk that may exist as well as the impact of these risks on the transformer through risk assessment of transformer,so that can we take the appropriate preventive measures to avoid failure of the transformer.This can not only effectively reduce the probability of transformer failure as well as improve the level of the entire transformer operation and maintenance,but also ensure the safe operation of the power grid.According to the complex characteristics of transformer fault,the fault tree analysis method is introduced for quantitative risk assessment of transformer in this paper.First of all,this paper statistics a large number of typical transformer fault cases with comprehensive consideration of various risk factors,.On the basis of this,a fault tree of transformer is established,Then put forward the power transformer risk assessment with the cosideration of the importance of each event,the idea of particle swarm optimization algorithm is introduced in the process of solving the importance of each event by using the fuzzy analytic hierarchy process,through the sharing of information among the particles the optimal weight can be found accurately and quickly.it has greatly improve the efficiency of the assessment process.At last,this paper carries out a risk assessment of a 220 kV transformer,which verifies the validity of the transformer risk assessment model based on fault tree analysis method.