Gas insulated switchgear
AssigneeKabushiki Kaisha Toshiba
InventorsToshiyuki Uchii, Yoshihiko Hirano, Yoshikazu Hoshina
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Abstract
Disclosed is a gas insulated switchgear constituted such that electrical contacts are placed inside a sealed vessel filled with an arc extinguishing gas, and when electrical current passes, the electrical contacts are held in contact and pass electricity, and when the current is interrupted, the electrical contacts are separated and an arc discharge is produced in the arc extinguishing gas, and the current is interrupted by extinguishing this arc. The arc extinguishing gas is a mixed gas, the main constituents of which are N2 gas and CH4 gas, and the CH4 content is at least 30%. Alternatively, the arc extinguishing gas is a mixed gas, the main constituents of which are CO2 gas and CH4 gas, and the CH4 content is at least 5%.
Claims22
A gas insulated switchgear in which at least a pair of electrical contacts are arranged in a sealed container filled with arc-extinguishing gas, electricity is conducted during conduction by maintaining the two electrical contacts in a contact state, the two electrical contacts are separated during current interruption to generate arc discharge in the arc-extinguishing gas, and current is interrupted by extinguishing the arc,
- wherein the arc-extinguishing gas is mixed gas mainly comprising CO2 gas and CH4 gas containing 5% or more CH4 gas.
A gas insulated switchgear in which at least a pair of electrical contacts are arranged in a sealed container filled with arc-extinguishing gas, electricity is conducted during conduction by maintaining the two electrical contacts in a contact state, the two electrical contacts are separated during current interruption to generate arc discharge in the arc-extinguishing gas, and current is interrupted by extinguishing the arc,
- wherein the arc-extinguishing gas is mixed gas mainly comprising N2 gas and CH4 gas containing 30% or more CH4 gas.
Dependencies are inferred from the claim text.