To solve such problems as frequent collector-ring's fire

complicated manual detection and low efficiency of large scale turbo-generators

this paper analyzes physical process of the collector-ring's fire and concludes the reason of the fault

by taking the collector-ring's fire fault occurred in a 670 MW generator as the example. Case studies for the common faults were carried out and uneven distribution of the brush current was considered as the major reason for the collector-ring's fire. It proposes using an online real time monitoring system to reduce occurrence rate of the collector-ring fire fault. Moreover

through software and hardware design

online monitoring for 128 brushes current was realized by using FPGA. This system has been operated in DCS system of several power plants

the results show that it can detect the faults and realize timely alarm

proving this detection method is effective and feasible.