New Structure Of The Dc Circuit Breaker And Its Measurement And Control System

DC circuit breakers are the most important protection equipments for DC power system._A new-type intelligent circuit DC breaker is studied in this thesis. Its intelligent core is a fast measure and control module based on Single-chip microcomputer and microelectronic technique, its operating-device is improved on the basis of traditional structure-, adopting simultaneous operation with a single machine and utilizing the current commutation principle to realize DC broken.Research works in the thesis include hardware and software designs of a measure and control unit, the improvements of operating-device design and test of the whole machine device, etc.The hardware designs of the module adopt high-linearity analog Optic-couplers and Optic-coupler-switches to realize input-signal amplified isolating and the isolation of output signal effectively. Software is designed in C51 language and short criterion adopts amplitude of current combining with its rising rate, and anti-interferences measures of the software, such as digital filtration, -are adopted. The novel, practical structure with permanent magnetic machine has improved the dependability and controllability of the circuit breaker greatly. A sample system was set up. Experiments cooperated with measure and control unit have proved that the new-type intelligent DC circuit breaker's design reasonable.With constant progressive of science and technology and demands of power system, intelligent DC circuit breakers will get deeply developed.