Circuit breaker compartmemt of an insulated switchgear with an electrode for decreasing electric field intensity

PURPOSE: A circuit breaker part of a gas insulated switchgear is provided to improve the electrical withstand voltage performance by alleviating the internal electric field concentration. CONSTITUTION: A lower conductive plate(12) seals the bottom of a ceramic insulating tube(11). A fixing output electrode is formed in the lower part of a bottom conductive plate. An upper conductive plate(13) seals the upper end of the ceramic insulating tube. A movable extraction electrode is formed on the upper part of the upper conductive plate. A fixed contact point(14) is electrically connected with the fixing output electrode. A moving contact(15) is electrically connected with the driving output electrode. A breaker is connected to the operating conductor of a vacuum valve. A pair of electric field mitigation electrodes(30) is respectively electrically connected with the fixing output electrode and the driving output electrode.