Research On The 12kV Rotating Disc Vacuum Circuit Breaker

With the development of vacuum technology, the application of a vacuum circuit breaker becomes more widespread, the industrial and mining enterprises, power plants, substations and center cabinet, fixed cabinet plays a role in the protection and control, but also in the application of vacuum circuit breakers exist Some problems, such as a leak of the vacuum interrupter, three-phase synchronization issues.In order to solve sealing problems of vacuum circuit breakers, and to achieve a three-phase synchronous breaking, design a new three-phase study rotating disc vacuum circuit breakers. The circuit breaker operating mechanism with regard to high vacuum interrupter in common to achieve a complete seal, driven by the operating mechanism to achieve three-phase synchronous moving conductive rod breaking. Due to the special nature of the structure, part of a three-phase rotating dise interrupter vacuum circuit breaker will be different from the traditional direct-acting contact structure, so for the circuit breaker, the interrupter is particularly important part of the design. Therefore study focuses mainly on the part of the vacuum interrupter design and analysis.First, in accordance with the relevant standards and empirical vacuum interrupter design and overall structure of the size of the various components of the arc chamber design, and build three-dimensional electric field analysis model parameters for the relevant dimension.Considering that the structure is a three-phase interrupter co-packaged in a vacuum environment, and therefore the larger three-phase electric field influence each other, using the finite element method for the biggest moment of internal phase to phase voltage three-phase rotating disc vacuum interrupter three-dimensional static field analysis, were obtained in the phase difference between the maximum potential, the interrupter and the conductive rod cross-sectional center plane electric field intensity distribution, and analysis of the reasonableness of the electric field distribution. Meanwhile, in order to improve the performance of the interrupter interrupter, the paper designed a new shield, and compared the presence or absence of the shield and shield shape the structure of the electric field distribution.Through further improve the electric field analysis provides the basis for the structure.In order to meet of breaking performance the three-phase rotating disc vacuum interrupter,the paper designs a compatible can not only enhance the mechanical properties of the contact,and extend the life of the contact head contacts new structure, based on the contacts establish relevant parameters structure dimensional magnetic field analysis model, and the model is three-dimensional eddy current field analysis. AMF obtained in current peak time and the current zero-crossing point in the center plane of the distribution of the arc, and the longitudinal magnetic field distribution of the direct driving type contact structure were compared. It explores the inter-phase contact control longitudinal magnetic field on the arc,eddy current distribution, lag time and its breaking characteristics.