Circuit breakers are vital equipment for protecting transmission systems. They cut off current instantly in the event of a system failure due to lightning or other issues./li>
With high voltage and high current distribution systems, a Gas Circuit Breaker (GCB) that uses SF6 gas, with three times the insulating ability of air, is applied.
This technology releases a circuit of electrodes within compressed gas, extinguishes the generated arc by blowing a stream of supersonic air, and interrupts the current.
Hitachi is developing Gas Circuit Breakers (GCB) that work with high currents, with voltages from 100 kV to 550 kV, and accurately support increases in breaking capacity.
For a UHV (ultra high voltage) transmission project in the United States, Hitachi delivered more than 40 800 kV GCBs (double break) through its subsidiary Hitachi T&D Solutions, Inc..
Hitachi is developing GCBs with high-level simulation technologies in R&D, including analytical elements such as high temperature, high voltage, supersonic flow, and discharge of power.
