| 摘要 |
<p>PURPOSE:To obtain an exciter in which a thyristor is not damaged even if a field breaker is mounted at an AC side by providing a bypass circuit in a field circuit. CONSTITUTION:A bypass pair is formed in a rectifying thyristor by a controller of an exciter at stopping time after an operation at normal time to trip a field breaker 41. If an exciting power source is failed due to the defect of a control circuit, the interruption of a main circuit thyristor or the output short circuit of a generator and a synchronizing signal is not input, and a heavy defect signal is input to the exciter. A gate circuit 9 is operated by the heavy failure signal to turn ON a thyristor switch 8, a closed loop is formed of a discharging resistor 7 and a field coil 3 to set an AC side field current to zero. An AC filed breaker 6 is opened in this state.</p> |
