Optimization Of Vacuum Switch Speed Sensor

Vacuum circuit breaker is the important switching equipment in power system,and whether the operation of the whole system is normal or not is related to the normal of the state parameter.Therefore,testing on the status parameters of vacuum circuit breaker is very important.The average speed of dynamic contact is selected as the testing signal,which plays an important role in the status parameters of vacuum circuit breaker.Then,the switching velocity sensor was designed and optimized with the modern sensor technology and finite element analysis theory.First of all,the structure of the switching velocity sensor was designed.The law of electromagnetic induction is the working principle of the switching velocity sensor.The greatest difference between the magnetoelectric speed sensor with the traditional closing speed sensor is that the magnetoelectric speed sensor needs no external power supply,and the output impedance is smaller,the circuit structure is simpler,the performance is more stable and the service life is longer.And it can work stably for 20 years without maintenance.It is indicated that double-coil can improve sensor sensitivity though transforming the output induction electromotive force formula and analyzing the distribution of magnetic field by using the finite element analysis software.Using finite element analysis software to compare the output characteristics of double coil and single coil structure,the results show that the sensitivity of double-coil sensor is higher.So the structure of sensor is ensured.Then,the initial structure size of the speed sensor was decided.As the sensor is mounted on the end of the movable connecting rod of the vacuum circuit breaker,the diameter of the coil winding,the diameter of the coil winding,the number of windings,the radius of the permanent magnet,the height of the permanent magnet was set up according to the size of the space.And the effect of the change of these parameters on the performance of the sensor was analyzed.The relationship between the variation of these dimensions and the output induced electromotive force was obtained by using the finite element analysis software,and it lays the foundation for the structure optimization of switching speed sensor.In the end,the multivariable optimization design of the switching velocity sensor wascompleted.In this paper,the speed sensor is the research object,and the optimal design was carried out by using the finite element analysis software.The size of the sensor is used as the design variable,and the maximum value of the output induced electromotive force is the objective function.Compared with the previous condition,the output voltage of the sensor has improved significantly.Then the performance of the sensor was analyzed and verified by experiments.The results of experiments indicate that the sensor designed in this paper can meet the requirements of actual detection.