Intelligent 355 degree rotary position sensor is a sensor with information processing functions, with a microprocessor, with the acquisition, processing, exchange of information, is integrated sensor and microprocessor products. Smart grid and many intelligent systems, not alone, but a large number of equipment and technology products. Which in the monitoring of the first line of the sensor device is small, but absolutely important. In the development of smart grid, the use of traditional sensors have been unable to some of the power of the product quality, fault location, etc. to make quick and direct measurement and on-line monitoring. The use of intelligent sensors can be directly measured, the product quality indicators, and failure to measure (such as temperature, pressure, flow). For example, in order to meet the needs of the development of smart grid, China launched a fiber-optic current sensing system, the realization of the pipeline current sensing system, all-digital closed-loop control, with stability and good linearity, high sensitivity to meet the large range of high range Accuracy measurement requirements.