Remote pump system, in-station pumping unit and method for automatically positioning fault of remote pump system

The invention provides a remote pump system, an in-station pumping unit and a remote pump system fault automatic positioning method. The remote pump system comprises a remote gain unit, a transmission optical fiber and an in-station pumping unit. The in-station pumping unit comprises a pumping source, a first coupler, a first optical detector, a second coupler, a second optical detector, a controller and a fault alarm module. The controller sets the power value of the pumping light emitted by the pumping source, calculates the optical power value Pin of the input end of the in-station pumping unit according to the received reflected pumping light detected by the first optical detector, and calculates the optical power Pout of the output end of the in-station pumping unit according to the received signal light in the transmission optical fiber. According to a preset method, system faults are judged according to the conditions of the pump light power, the light power Pin of the input end of the in-station pump