Patent ID: 8705220

Claim:
A surge arrester which is connected to a gas-insulated electric equipment in which insulating gas is sealed, comprising: a switching unit switching a limited voltage of the surge arrester into a limited voltage smaller than a low-temperature critical voltage indicating a withstand voltage generating a dielectric breakdown when the insulating gas is liquefied; a high-temperature surge arresting unit connected to the gas-insulated electric equipment and having a limited voltage smaller than a high-temperature critical voltage indicating a withstand voltage generating the dielectric breakdown when the insulating gas is at a predetermined gas pressure; and a low-temperature surge arresting unit connected to a disconnecting switch connected to the gas-insulated electric equipment, and having a limited voltage at the low-temperature critical voltage or less, wherein the switching unit switches the limited voltage of the surge arrester into the limited voltage smaller than the low-temperature critical voltage by setting the disconnecting switch from an open state to a closed state to electrically connect between the gas-insulated electric equipment and the low-temperature surge arresting unit.