| 摘要 |
<p>PURPOSE:To suppress fluctuation of field voltage of a generator in a normal state, by employing a nonlinear amplifier circuit having a low amplification degree for an input lower than a predetermined level and a high amplification degree for an input higher than the predetermined level. CONSTITUTION:Under normal stable operating condition, fluctuation of a stabilized input signal fed to a signal reset circuit 1 is low. Consequently, only a low amplification amplifier circuit 5 functions. Upon occurrence of a large disturbance in electric power system, the stabilized input signal fluctuates considerably. Consequently, the level of a deviation signal X exceeds over a predetermined level set in a dead zone circuit 6 which outputs a signal corresponding to the level of the deviation signal X to a high amplification degree amplifier circuit 7. Consequently, the amplifier circuit 5 is operated with sum amplification degree of the low and high amplification degree amplifier circuits 5, 7 thus providing a considerably higher amplification degree.</p> |
