126kV high-voltage vacuum circuit breaker synchronous permanent magnetic actuator and control

Title: 126kV high-voltage vacuum circuit breaker synchronous permanent magnetic actuator and control technology research Author: Ma Shaohua Degree-granting units: Shenyang University Keywords: vacuum circuit breaker;; pressure;; magnetic actuator;; synchronization Abstract:
Permanent magnet actuator structure is simple, spare parts, high reliability, operating life long, action dispersion is small, very suitable equipped with vacuum circuit breakers, is the only technology able to synchronize the control actuator, has been widely used in medium voltage vacuum circuit breaker. Although the market for high-voltage level of permanent magnetic actuator has been very concerned about, but have not yet seen the product at home and Neodymium Magnets abroad reported. To meet the development of high-voltage vacuum circuit breakers need to fill the high-voltage magnetic actuator of the international space, this study used simultaneously with making and breaking capabilities of 126kV high-voltage vacuum circuit breaker magnetic actuator.
In this paper, virtual prototyping technology, the use of Ansoft Maxwell 3D/2D simulation software for magnetic actuator electromagnetic system of static and dynamic properties were calculated. Through theoretical analysis and comparison, about the use of primary and secondary coils in series excitation field winding ways to improve the effect, so that the movement of moving core in the long journey to get enough of the next operation is always successful. Excitation method proposed in this paper significantly improves the characteristics of permanent magnet actuator, so that sub-gate and the closing time, energy storage capacitors to reduce energy consumption, reduce peak current excitation coil, sub-gate and the closing velocity increases, moving core impact collisions slow down when closed, not only to meet the 126kV high voltage vacuum interrupter-off requirements, but also to improve the medium-voltage performance of permanent magnetic actuator provides a good solution.
To meet the synchronization accuracy and reduce the dispersion of the action, the need for permanent magnetic actuator of the operating time to compensate. In this paper, statistical learning theory, a least squares support vector machines based on permanent magnet actuator movement time prediction model. Using cross validation and grid search method to determine the core functions and support vector, then get a vector with only minority support for the prediction function expression. The simulation results show that the validation data, least squares support vector machine model has a strong generalization (forecasting) ability to obtain a smaller fitting error in the forecast http://www.everbeenmagnet.com/en/products/110-sintered-neodymium-magnets on the basis of minimum error, maximum error is less than ± 0.2ms , computational complexity is small, easy-to-line programming.
Electrical circuit breaker synchronous control is the development of intelligent direction and cutting-edge issues. At present, the synchronization technology has turned into the practical stage, but not easy to precisely synchronized with the signal breaking, breaking synchronization technology is still in the theoretical preparation. In this paper, the general expression of short-circuit current starting, parameter identification and adaptive arithmetic recursive method with the DC component of the transient short-circuit current decay for analysis, a mathematical model for forecasting short-circuit current zero. Analyzed using Matlab software, sampling rate, A / D converter quantization precision and signal to noise ratio of short-circuit current measurement circuit waveform analysis accuracy. After comprehensive comparison, made with 7 / 8 wave arithmetic recursive formula predict changes in properties of short-circuit current, with an estimated zero-crossing. The projections presented in this paper short-circuit current of 7 / 8 wave count recursive formula, the only 12bit A / D converter, each fundamental cycle, the sampling rate and 32 times more than 60dB signal to noise ratio of the circuit, easy hardware implementation and software programming.
Field programmable gate array developed in recent years as a general-purpose user-programmable devices, it has both the gate array of high integration and versatility, there are user-programmable flexibility, high speed, low power consumption, general strong, especially for complex systems design. This design uses a microcontroller and FPGA combination of parallel processing, design of permanent magnet synchronous actuator intelligent control system. The use of SCM measurement and control functions, the FPGA as an embedded microcontroller chip, designed to analyze the changes in short-circuit current characteristics, improve the synchronization of real-time and reliability. Degree Year: 2009