Device, method and system for collecting smart power grid analog quantity

The invention provides a device, method and system for collecting smart power grid analog quantity. The device for collecting the smart power grid analog quantity comprises electronic transformers and merging units. The electronic transformers include the electronic current transformer and the electronic voltage transformer. The merging units include the bus merging unit and the interval merging unit. The device, method and system have the advantages that output signals collected by the electronic transformers are divided into a protection class, a measurement class and a metering class, and meanwhile the overall sampling speed is increased; the number of sampling value message output ports of the merging units is multiple, contents of sampling channels of each port and the overall sampling speed are configurable, it is guaranteed that signals output by the merging units can meet requirements of multiple application occasions such as protection, measurement control, metering and electric energy quality for sa