The invention relates to a generator accident reinforced excitation circuit, wherein the
secondary side of an excitation
transformer is a duplex winding which is respectively connected with a first
rectifier and a second
rectifier; the first
rectifier is connected with a first
diode and a rotor winding in series; the second rectifier is connected with a second
diode and the rotor winding in series; one end of the rotor winding is connected with the
anode of the first
diode, and the other end of the rotor winding is connected with the
cathode of the second diode; and a
thyristor switch is connected between the
cathode of the first diode and the
anode of the second diode. By the structure innovation of the excitation main circuit, the invention completely optimizes the function features of the
system, improves the parameter performance under an normal operation condition, achieves the purposes of high safety of 99.99%, high efficiency, energy saving, consumption reduction, and the like during long-term operation of an excitation
system, reduces the cost of high-parameter excitation configuration, is favorable for
safe operation for a long term, and ensures sufficient supply of accident reinforced excitation to generators.