Papers by Author: Jian Feng Zheng

Abstract: With the development of component technology, there are many powerful third party components. TeeChart control as one of them was widely used for waveform display and processing. Combining the software development of multi-channel waveform analysis, this paper introduces the characteristics and attributes method of TeeChart control. With using the control, it can realize graphical display of keeping historical data, contrast analyze of the multiple wave etc. And the waveform can be saved as picture or PDF format. Be given the correlation realization code in the Delphi 7.0 development environment.

Abstract: For knowing the dielectric loss of high-voltage capacitive electrical equipment timely and mastering the electrical insulation of high voltage equipment effectively to ensure the reliable operation of these voltage equipments, an online monitoring system is designed in this paper based on the practical project. The system is made up of two parts including lower computer and upper computer. Using the microcontroller C8051F023 as the core of the lower computer and adopting an improved zero-crossing comparison method, the measurement of dielectric loss is realized and the data are sent to upper computer by wireless way. SQL2000 is used in the upper computer for data management, which can be real-time displayed, inquired and printed in report forms. At present, this monitoring system has successfully applied in the Houqiao 330 kV transformer substation in Ningxia. The operating results show that the system can meet well the online monitoring demand of the high voltage capacitive electrical equipment.