Dong H.,Dalian Jiaotong University |
Dong H.,State Pinggao Group Co. |
Sun Q.,Dalian Jiaotong University |
Si M.,Dalian Jiaotong University |
And 4 more authors.
Zhenkong Kexue yu Jishu Xuebao/Journal of Vacuum Science and Technology | Year: 2016
A novel algorithm was developed to precisely determine the opening velocity of a vacuum circuit breaker by processing the arc images taken with a charged coupled device (CCD) camera. Two schemes: gray level moments algorithmand image gradient gradation, were used to accurately locate the edge positions of the fixed and moving electrodes. Moreover, the interference edge points were removed by Hough transform, and the true arc edge line was determined by least square data fitting of the remaining edge points. The instantaneous velocityof the moving electrode can be calculated in terms of the average inter-frame speed. The results show that the newly-developed sub-pixel detection algorithm, gray level moments algorithm, is capable of more precisely locating the moving electrode with an error of 0.01pixel to 0.35pixels. The fitted opening velocity with smaller fitting error was found to be smooth, accurate and fairly stable. © 2016, Science Press. All right reserved.