| 摘要 |
<p>1,029,195. Synchronizing alternators. WESTINGHOUSE ELECTRIC CORPORATION. July 30, 1963 [Aug. 9, 1962]. No. 30076/63. Heading H2H. A synchronizing circuit for two alternators 10, 11 comprises a transformer 18 supplying a difference in phase voltage through a diode 20 to a smoothing capacitor 21 and a potentiometer 19. When the generators are nearly in phase, the voltage V 1 applied to a Zener diode 22 is below the breakdown voltage of the diode 22 hence current will flow to the gate of a thyristor 24 through a resistor 25 making the thyristor conductive. When the frequency difference is small, the voltage V 3 from a longtime constant circuit 41-45 is alternately above and below the breakdown value of a Zener diode 44, hence through transistors 46, 48 the thyristor is intermittently shunted sending pulses through a capacitor 31 to a transistor 32 which conducts. This blocks another transistor 33 raising the gate electrode potential of another thyristor 34 or other solid state device to its anode potential through a resistor 38, hence this thyristor fires and closes the circuit breaker 15 through a coil 16.</p> |
