High-precision wide-range digital zero-sequence current sampling device

The utility model discloses a high-precision wide-range digital zero sequence current sampling device, which comprises an impedance isolation and signal conversion module connected with the secondary side of a current transformer and a digital remote transmission module communicated with a remote controller through an optical fiber, a signal strength detection module and a CPU control module are connected in series between the impedance isolation and signal conversion module and the digital remote transmission module, the output end of the CPU control module is connected with a program control amplification module, and the input end of the program control amplification module is further connected with the output end of the impedance isolation and signal conversion module. The output end of the program control amplification module is connected with the input end of the CPU control module through the A/D sampling module. According to the utility model, high-precision and wide-range analog quantity acquisition a