Gas insulated switchgear

A gas insulated switchgear in which a pair of contacts are arranged in a sealed container filled with an insulating gas having a global warming potential lower than that of SF6 gas, electricity being conducted during conduction by maintaining the two contacts in a contact state, and the two contacts opening during current interruption, to extinguish an arc generated between the two contacts by blowing the insulating gas thereon, comprising:

• a gas flow generating means for blowing the insulating gas onto the arc generated between the contacts during an opening operation of the contacts,
• wherein said gas flow generating means comprises a pressure accumulation space, a pressure raising means for raising a pressure of the pressure accumulation space, and a gas flow channel that joins the pressure accumulation space and the arc,
• wherein said pressure raising means comprises a puffer piston for compressing said pressure accumulation space, and
• wherein said insulating gas is a mixed gas comprising at least 50% of a gas comprising the elements C and O, and the mixed gas comprises greater than or equal to 5% and less than or equal to 25% of H2 gas.

A gas insulated switchgear in which a pair of contacts are arranged in a sealed container filled with an insulating gas having a global warming potential lower than that of SF6 gas, electricity being conducted during conduction by maintaining the two contacts in a contact state, and the two contacts opening during current interruption, to extinguish an arc generated between the two contacts by blowing the insulating gas thereon, comprising:

• a gas flow generating device configured to blow the insulating gas onto the arc generated between the contacts during an opening operation of the contacts,
• wherein said gas flow generating device comprises a pressure accumulation space, a pressure raising device configured to raise a pressure of the pressure accumulation space, and a gas flow channel that joins the pressure accumulation space and the arc,
• wherein said pressure raising device comprises a device configured to raise the pressure of the pressure accumulation space by introducing into the pressure accumulation space thermal energy generated in the arc,
• wherein said insulating gas is a mixed gas comprising greater than or equal to 20% and less than or equal to 50% of O2 gas and at least 50% of another gas comprising the element C,
• wherein said gas comprising the element C is any of CO2, a perfluorocarbon, and a hydrofluorocarbon,
• wherein an absorbent for absorbing water, CO, and O3 is arranged in said sealed container, and
• wherein said sealed container is provided with a detecting device configured to detect CO gas and O3 gas inside the sealed container.