| 摘要 |
1. In a protective device for protecting a facility from damage due to an unexpected increase in the normal voltage on said facility, said protective device comprising a plurality of spark gaps, said gaps being serially connected, in a chain, across said facility; a corresponding plurality of resistors, one of said resistors being connected in parallel across each of said gaps, and in series with the rest of said resistors across said facility, to control the potential developed across each gap; a plurality of capacitors directly connecting alternate electrodes of each gap to opposite ends of said device whereby any unexpected voltage increase which occurs is immediately and directly coupled by said capacitors to each of said gaps. |
