| 摘要 |
<p>PURPOSE:To supply a system with stable power by changing over automatic voltage regulators to a back-up automatic voltage regulator from a regular automatic voltage regulator without stopping an AC generator. CONSTITUTION:When the regular automatic voltage regulators 5 are brought to unusable states, changeover switches 8 are changed over first, and extiters 9 are supplied with an output from the back-up automatic voltage regulator 6. Changeover switches 7, 7' are changed over under conditions that contacts 8-2 are brought to ON states. The voltage of the generator through transformers 3 for meters is inputted to the back-up automatic voltage regulator 6 by turning contacts 7-1 OFF and contacts 7-2 ON. On the other hand, a contact 7'-1 is turned OFF after a contact 7'-2 is turned ON from OFF, and the currents of the generator through a current transformer 4 for meters are inputted to the back-up automatic voltage regulator 6. Accordingly, the system can be supplied with stable power.</p> |
