| 摘要 |
25307-234 The present invention relates to a surge protector for suppressing a surge voltage generated on transmission lines. The surge protector of the present invention has a first suppressor comprising a penta-electrode discharge tube having first positive and negative electrodes and second positive and negative electrodes, any one of which is operatively connected to first input terminals and to a grounded grid electrode. A switch is provided one end of which is operatively connected to the first positive electrode or negative electrode and the other end to said second input electrode. Also provided is an ON-OFF switch control which is operatively connected to the second positive and negative terminals to control the ON-OFF operations of the switch. Finally, there is included a second suppressor comprising first and second resistors connected respectively in series to the transmission lines and a metal oxide varistor which is connected in parallel with the transmission lines to suppress a surge voltage by converting it into heat. The invention prevents system shut-down by grounding detected by terminal equipment at the time of suppressing a surge.
|
