Design Of ECT Data Collecting System With Low Power Consumption

With the incessant improvement of transmission capacitance and rated voltage in power system, conventional ferromagnetic transducers have several shortcomings and have been already difficult to meet the need that network develop towards automation and digitized direction. In this case, considerable interest has been paid to the electronic transducers, based on computer and optical technology. This paper makes some research and design in allusion to the ECT data collecting system with low power consumption, which is one of the practical technology about electronic transformer.In the beginning, the paper introduces the problems which conventional ferromagnetic transducers are faced with and the excellences the new type electronic transformers are provided with. After the achievements of research around the world a few years are summarized, the paper introduces the basal structure and principles of running, and a sample of low power consumption ECT data collecting system is designed. The primary task includes the design of low power consumption data collecting system in high voltage part, low power consumption optoelectronic transmission system and secondary converter in low voltage part.The design of data collecting system in high voltage part includes the low power consumption of primary sensor and primary converter. Then it introduces anti-alias filter, signature modulating circuit in front, compiled data collecting code. With the A/D transformer circuit, temperature collecting module and the ADC of microprocessor in primary sensor, we realize the function of data collecting and system state supervising. Then, the anti-jamming measure in the high voltage part is introduced.The design of optoelectronic transmission system, including the design of low consumption LED drive circuit and ascending decode circuit, application of NRZ asynchronous bunch coding mode, and the capability of optoelectronic transmission system is tested at last of the chapter. The experimental results show that the primary converter which includes the improved circuit driving fiber transmitter can work reliably consuming averagely no more than 40mW power; data signal can be transmitted at baud rate as fast as 200kb/s from the second to the primary converter, and 2Mb/s at the opposite direction.The design of secondary converter in low voltage part includes the figure port and the simulate port.The paper summarizes at last, and brings out the problems needed to be solved in the future.