Research On Electronic Current Transformer

With the rapid development of electrical power industry, the increasing of power capacity and voltage class, traditional transformers have shown a lot of limitations, so we need research on new concept of electronic transformers. Electronic transformer is an important part of the digitization electric substation. At present, the products and technology of opto-electronic transformers from the international ABB, ALSTON and other companies is already developing, meanwhile the domestic research work has begun and applied. The development of electronic transformers draws much more attention from domestic industries and enterprises, but the technology is still falling behind other developed contries.Having consulted the status of the research work in this area, according to the related standard and work principle of electronic transformers, the paper designed a high-voltage data-collector which uses FPGA as its MCU and the CPU plug-in based on ARM and FPGA. The hardware circuit of data-collector used FPGA instead of the traditional MCU and chipped the power module directly on the collector, not depended on laser/coil power sources; using the high performance and resolution AD7606to meat the need of the collector's precision and demand; the technology of fiber optic communication used FT3agreement instead of the traditional SPI, so this resolved the problem of interworking from the different factories. The hardware of CPU plug-in used the method of division of ARM and FPGA work and designed the versatile interface such as RS-232, RS-485and Ethernet to meat the need of the different merge units.Then the paper designed digital filter in the merge unit based on DSP Builer and Altera IP Core.Finally, this paper completed the debugging and validation of the electronic transformer system. The verification proved that this newtype electronic transformer meet design requirements, and have a good accuracy and stability.