| Summary: | 碩士 === 國立臺灣科技大學 === 電機工程系 === 95 === The purpose of this thesis is to develop a programmable high AC current source for testing, and this current source’s output current is applied to circuit-breakers providing over-current protection by electronic means. For this, being analyzing the impedance characteristic of circuit-breaker is analytically similar to an inductance. The angle that was solved by PWM programming is switch’s command, then collated the filter to promote selective harmonic and eliminate others. Output the selective harmonic current to supply the circuit-breaker for testing. Finally, the proposed system of this thesis has been established and simulated by MATLAB/Simulink. A digital signal processor, TMS320LF2407A, is used to implement the controller of system. Both the simulation and experimental results are obtained to illustrate the validity of the proposed system.
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