The Study On The Electromagnetic Characteristic Of Low-Voltage Circuit Breaker

With the advancement of the requirement of the low-voltage electricity-distributed, the low-voltage circuit-breaker is developing towards the orientation of the modulation, the intellectualization, the network. At the same time, with the appearance of many electric appliance working under the different frequency, also make the different change to the low-voltage electric appliance requirement. In many special field such as aviation and navigation field, considering the power supply function and antijamming , at present mostly is using frequency 400Hz to carry on the power supply. Electric appliance using in the ship design in the present stage mainly depends on the rebuilding of the electric appliance under frequency 50Hz. But the frequency change brings a series of problems. How to design the circuit breaker to adapt the special frequency requirement has become the important topic of the design and the manufacture unit.The paper, with the Low-voltage circuit as its objective, combines with SEARI and does some research in the following fields. Introduce the basic structure of the low-voltage circuit breaker in the ship, and mainly introduce the key part of the circuit breaker—electromagnetism releaser. In view of the low-voltage circuit breaker electromagnetism releaser, introduce the electromagnetic field computational method, introduce large-scale finite element analysis software ANSYS.Analyze the influence of frequency change to the electromagnetism attraction performance, discover the main reason of electric current enhancing of 50Hz releaser using in the 400Hz.Applying electromagnetism theory, carries on the electromagnetism analysis computation in view of some section circuit breaker electric current instant tripping mechanism, prove above view point. And this paper uses in MATLAB the GUI module, develop electromagnetism analysis computation software. The user carries on the interactive operation conveniently. Using the magnetic field analysis theory, partially carries on the analysis in view of the electric current release electromagnetism, utilization large-scale finite element analysis software ANSYS, the use finite element method calculates the low-voltage circuit-breaker release force.Partially carries on the optimized design in view of the current release electromagnetism, the goal is for the purpose of reducing the release current. And propose a plan the circuit breaker release mechanism carries on the optimization to other specifications under, the question which in the solution entire series exists.Finally carries on the summary to the full text, and has carried on the forecast to the next further research work.