Optimal Design And Development Of High-voltage Electromagnetic Relay

High-voltage electromagnetic relay plays an important role in control,circuit conversion,safety grounding,etc.in high-voltage and high-power power supply equipment and systems,and plays a role that semiconductor switches cannot replace.In view of the shortcomings of traditional high-voltage electromagnetic relays,such as low withstand voltage,large working noise,and serious temperature rise of coils,in-depth research has been carried out on the overall design,local optimization,DC power supply operation and reliability measurement and control platform development of high-voltage electromagnetic relays.In the design of high-voltage electromagnetic relay,the overall design of the highvoltage electromagnetic relay is based on the key parameters such as contact withstand voltage,release time and contact resistance,and Ansoft Maxwell is used to simulate the three-dimensional finite element dynamics of the electromagnetic mechanism.The parameters verify the feasibility of the design,and at the same time analyze the vibration damping effect of the magnetic separation ring on the electromagnet under AC power supply and its heating.The optimization of the high-voltage electromagnetic relay is based on the preliminary design in the paper,and is locally optimized from the electromagnetic system of low-voltage side and the contact of high-voltage side.Apply multi-objective genetic algorithm to the low-voltage side to optimize the volume and coil power,obtain the optimal solution set and select appropriate results,and improve the volume and power.Apply the parameterized scan based on COMSOL to the contact part for size and circle.Parameter optimization of the chamfer radius,selecting a specific set of points in the space for observation and evaluation,and selecting the optimized parameters according to the critical value of the electric field strength of the air breakdown.Aiming at the serious problems of vibration,noise and heat in the working process of AC electromagnetic relay,three simple and feasible coil DC power supply operation schemes including transformer-based step-down rectification,thyristor-based halfcontrolled rectification and MOSFET-based full-controlled rectification are proposed.The feasibility and design are verified based on Simulink.And related hardware and software circuits are built;designed and developed a high-voltage electromagnetic relay reliability monitoring platform,which can realize automatic on-off power control,fault diagnosis and recording of working conditions,used to find problems in design and processing,and then improve high-voltage electromagnetic relay performance.Finally,the prototype of high-voltage electromagnetic relay was processed,and the DC power supply operation and reliability measurement and control platform of high-voltage electromagnetic relay were built.The AC power supply,DC power supply operation and high-voltage side related experiments were carried out.The results show that the key parameters meet the design specifications,and the optimized performance parameters are effectively improved,DC power supply operation mode and reliability measurement and control platform can achieve the design goals,which all prove the validity and correctness of the design.