Optimization Design Of 10kV Fast Mechanical Switch

With the development of our country's economy,higher requirements are imposed on the quality of the power system and the electrical energy it produces.As a key control and protection device of the power system,circuit breakers have become increasingly demanding for their operating time and stability.The operating mechanism,as a key component affecting the breaking speed of the circuit breaker,also has higher requirements.However,the traditional operating mechanism is gradually difficult to meet the requirements of the circuit breaker for the segmented speed.The electromagnetic repulsion mechanism(ERM)has gradually become a research focus because of its fast breaking speed and simple structure.As a traditional operating mechanism,the permanent magnet actuator(PMA)has the characteristics of simple structure and high stability.And when the PMA is closed with the vacuum circuit breaker,it has a strong matching with the characteristics of the circuit breaker.However,due to the slower reflection speed and longer excitation time of the PMA,it is gradually unable to meet requirements for fast opening of circuit breakers.The working principle of the electromagnetic repulsion mechanism(ERM)mainly uses the eddy current effect,which has the characteristics of fast breaking speed.At the same time,its output characteristics match the reaction force characteristics of the vacuum circuit breaker when it is opened,but the output time of the electromagnetic repulsion mechanism is short..When it enters the overtravel stage in the late closing period,its movement speed will decrease,its moving speed will decrease,so its output in the process of closing is poorly suitable for the breaker.Based on the advantages and disadvantages of the PMA and the ERM,this paper uses a hybrid operating mechanism that uses the PMA to hold and close and uses the PMA to open.Firstly,this paper introduces the development and current situation of the operating mechanism,explains the basic working principle of the PMA and the ERM,and establishes their mathematical models through mathematical derivation;through mathematical derivation.Combined with the design method of each part of PMA,a set of systematic design process is summarized,and the finite element simulation software is used to model and analyze.At the same time,use simulation software to simulate and analyze the influencing factors of the ERM,and obtain the main parameters that need to be optimized.Then,for the defects of the basic particle swarm,combined with the reopening and opposition-based learning strategies,the multi-strategy improved particle swarm optimization algorithm was used to optimize the key parameters of ERM.Finally,the prototype was fabric ated based on the optimized parameters and testing processes were carried out.The results sh ow that the optimized switch's breaking speed is improved while reducing the total volume an d cost of the switch,which verifies the effectiveness of the optimized design.