The Software Development Of Vacuum Circuit Breaker's Mechanical Characteristics Testing Based On LabWindows/CVI

Vacuum circuit breaker is a sort of important electric equipment of switch wiring which takes on the controlling and safeguard in electric power system, Its running state directly affects the safe of the electric system and the benefit of economy. The thesis analyze the existing state and problem of the vacuum circuit breaker's mechanical characteristic testing on the foundation of the extensive survey, and give some improving methods of it. It includes content about these:(1) Analysis and research on testing signalsThe vacuum circuit mechanical characteristic testing adds some new signals to monitor. They include: contactor's travel signal, opening/closing coil's current signal, opening/closing coil's voltage signal, three-phase fracture status digital signals and so on. The thesis researches the importance and necessity for testing them.(2)Research on speed testingThe moving contactor's speed is one of important parameters when the vacuum circuit breaker switches on or off. It is a necessary testing before the product on sail, transferring and repair. But the definition of the speed is very complex. Different vacuum circuit breakers have different definition. Thus, speed testing are very mess if definition is confusion. They are summarized and concluded in this paper. And it advances some reasonable methods to solve problem.(3)Software developmentThe software developing is based on LabWindows/CVI, and Access data management. It can control the data acquisition card to acquire data and process the acquired data, calculate and analyze the mechanical characteristics by human interface. And the software has powerful data management function.The testing results show that the software can give correct results if the acquired data is accurate.