Mitsubishi Denki Kabushiki Kaisha

Shoji Tada

Shiro Yamauchi

Masao Izumo

Koji Ibuki

Takahiko Inuzuka

Nobuo Nagai

Kuniaki Nakashima

Toshiko Sugio

Tugio Watanabe

A gas detector for detecting the decomposed SF.sub.6 gas produced by discharge in gas-insulated equipment. The gas detector operates as a cell generating voltage in proportion to the amount of the decomposed SF.sub.6 gas wherein the voltage is generated between the detection electrode including Ag, reacting upon contact by the decomposed gas and the opposing electrode including Ag also, both electrodes sandwiching the ionic conductive solid electrolyte layer including Ag ion therebetween.

Gas detector

A gas detector, which has a memory function for detected data, such as the quantity of decomposed SF.sub.6 gas, is for always watching whether electric discharging in the gas-insulated substation occurs or not, and comprises the laminated layers having a detecting electrode, a first conductive solid electrolyte, a polarization electrode, a second conductive solid electrolyte and a reference electrode.

A circuit breaker for opening and closing contacts disposed on each phase of a multiphase electric power line has a photo-diode array and a light emitting diode array disposed on opposite sides of a driving rod of a driving mechanism, with a light passing aperture provided in the driving rod. When the aperture in the rod crosses the respective light paths between the photo-diodes and the corresponding light emitting diodes, the photo-diodes issue electric output signals corresponding to movement of the driving rod. By processing these output signals, any abnormal breaking of the breaker contacts among the phases is detected.

Device for producing even closing of a circuit breaker

An arc detector includes a luminous diode 22 for irradiating the space within a vessel 1 containing an electrical device such as a bus bar 5 and filled with insulating gas such as SF.sub.6. A shielded photo-diode 24 receives light reflected back from a fine powder 12 produced when an arc occurs, and drives an indicator 8.

Arc detector for gas insulated electrical apparatus

A grounded cylindrical metallic housing is hermetically closed at one end and an electric insulation hermetically extends through the other closed end of the housing to form in the housing a space filled with an electrically insulating gas. An arrester element disposed in the space has the incoming-line side connected to a terminal extended and sealed through the insulation and the ground side electrically connected to the housing. The incoming-line side of the arrester element is surrounded by both the insulation and a shield ring embedded therein.

Growing community of inventors

Amagasaki, Japan

Shoji Tada