Mitsubishi Electric Corporation has developed two technologies for gas-insulated switchgears: an arc-cooling technology that achieves a 25 percent improvement in the interruption of electrical current in sulfur-fluoride (SF6) gas-insulated switchgears used in high-voltage power systems, and a high-density dielectric coating technology that improves insulation performance by 30 percent in high-voltage conductors.
The two technologies will contribute to the further miniaturization of switchgears and help to reduce the use of SF6 gas, which has global-warming potential that is 22,800 times greater than that of CO2.
The Key Features include:
1) Arc-cooling technology for interrupter improves current-interruption performance by 25 percent
- High-pressure gas generated with a unique coolant effectively cools and then extinguishes the conductive arc (conductive plasma) during current interruption.
- Current flow through the arc is reduced by the arc’s change into insulated gas, thereby improving current interruption by 25 percent compared to a conventional non-coolant method.
2) High-density dielectric coating technology improves dielectric performance by 30 percent
- The high-density dielectric coating technology densifies the dielectric coating layer on high-voltage conductors and thereby improves dielectric performance by 30 percent compared to operation without this dielectric coating layer.
3) Downsizing enables reduced use of SF6 gas
- Improved current interruption achieved with the new arc-cooling technology enables the number of interrupters to be reduced from two to one.
- The new high-density dielectric coating technology suppresses discharges from the conductor surfaces, making it possible to reduce the size of the SF6 gas tank.
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