The Research On Heavy DC Transformer

Heavy direct current (DC) measurement has been widely used both in manufacturing and scientific researching. With more and more direct current power absorption, it is very urgent to develop the methods and instruments for heavy DC measurement to meet such requirement. This treatise is ground on the item of National Natural Science Fund "the research of multiplex Rogowski coils intelligent heavy DC sensors". According to our comprehension on the main principia of heavy DC measurement, we determine to study the theory of Rogowski coil and DC comparator., for making a good foundation in theoretically and experimentally. After lucubrated the measuring elements and the method of design, we reckoned the relation of the coil's electric parameters and dimension parameters. Then we get the system function figuring with the dimension parameters, and founded the simulation model under the environment of MATLAB. By comparing the simulation results of the characteristics both of the time and frequency-domain of the coil with different dimension parameters, the rules of designing proper coil and the choice method of the optimal dimension of the coil have been summarized and proposed. How to realize comparatively movement between the coil and the magnetic field? This is the signify point for DC measurement by using the Rogowski coil. So two experimentations were developed for discussing. On the other hand, there are two important sides for DC Comparator. The first one is the choosing for the capability parameters of the magnetic core, especially the magnetization curve. We make multi-point sampling and subsection to dummy the magnetization curve. Another one is how to judge the balance of the magnetism influence in the core. According to actuality of the present methods, we bring forward a new measurement scheme by comparing the output wave from the detect coil. In order to establish the elementary sensor model, we simulated the mathematics model and carry out a feasible project to dissolve the above problems. At last, the article bring forward the assume for auto-adjustment by using Single Chip Micyoco(SCM), and point out the methods for ameliorating the precision and error of measurement.