Abstract: A gas circuit breaker comprising: a sealed tank; two breaking sections disposed in the sealed tank; a bracket to support movable parts of the breaking sections while enabling switching operation of the movable parts; an insulation cylinder to support the bracket through an electric field relaxation shield; an insulated operating rod disposed in the insulation cylinder movably in the axial direction and an end thereof is connected to an actuator; and a link mechanism connected to other end of the insulated rod and transmits drive force from the actuator to the movable parts of the breaking sections, wherein the electric field relaxation shield is provided with out-side groove and in-side groove on the insulation cylinder respectively, and the out-side groove and in-side groove are formed openings at the link mechanism side respectively, and end of the in-side groove is extended to near the outer surrounding of the insulated operating rod.

Abstract: Each integral unit is structured by arranging partial units (I), (II), and (Ill) side by side, while line-side devices are branched from positions between the partial units adjacent to each other. Each of the partial units is structured by connecting a current transformer and a disconnector in sequence to each of upper and lower outlets horizontally drawn out from a lateral face of a vertical-type circuit breaker in the same direction. Any two partial units positioned adjacent to each other are connected in series by connecting the disconnectors included therein with a connection bus. The line-side devices are positioned to oppose the circuit breakers while the disconnectors are interposed therebetween. The switchgear includes a plurality of integral units. Two ends of each of the integral units are respectively connected to two main buses that are provided in an upper position and a lower position while the disconnectors are interposed therebetween.

Abstract: A switching device, in particular a power switching device, has two pairs of series-connected switching contacts for interrupting a conducting path and at least one quenching packet, disposed near the pairs of switching contacts, for quenching the arcs occurring when the conducting path opens. The pairs of switching contacts are arranged such that their opening paths are substantially mutually parallel or antiparallel. The pairs of switching contacts are connected in series such that the same current flowing in both arcs flows spatially in the same direction. The quenching packet is disposed in the area between the opening paths.

Abstract: A gas-insulated power apparatus comprising a vertically arranged gas-insulated circuit breaker included in a vertically arranged gas-insulated main tank, a first gas-insulated branch pipe connected to one side of an upper portion of the gas-insulated main tank substantially orthogonal to a direction of extending the gas-insulated main tank and leading out a feeder from a movable side of the gas-insulated circuit breaker, and a second and a third gas-insulated branch pipes which are respectively connected to both sides in a peripheral direction of a lower portion of the gas-insulated main tank substantially orthogonal to the direction of extending the gas-insulated main tank, one of which connects a fixed side of the gas-insulated circuit breaker to one gas-insulated Y bus of gas-insulated double buses and other of which connects the fixed side of the gas-insulated circuit breaker to other gas-insulated X bus of the gas-insulated double buses, respectively, by which a gas-insulated power apparatus having a str

Abstract: Each power source switching unit (8) of a electric power system (1) constituted of a power operating system having a power generator (3) driven by an external power source (40) and an engine (4) is constituted of a means for sensing information on a selected power source and supply power in time series, calculating a supply power quantity every power source on the basis of sense data, and storing these sensing and calculated data. This power source switching unit (8), disposed every power load group, comprises a means for communication with another power source switching unit (8). A power source management system, constituted of the power source switching unit (8), comprises a means for transmitting the sensed data or calculated data of each power source switching unit (8) to the control system of the power generating system, a means for receiving data transmitted from the power source management system, and an image display means for displaying the received data by graphing.

Abstract: In order to provide a good gas-insulated circuit breaker which is compact and easy in assembling and preparation, a gas-insulated circuit breaker 100 is constructed with a grounded enclosure 104 enclosed a insulation nature gas, a current interruption part having a fixed contactor 115 arranged in the grounded enclosure 104 and a movable contactor 116 to be contacted with and to be separated from the fixed contactor 115, and an operating mechanism 101 to output a driving force to drive the movable contactor 116, wherein a grounded enclosure side main rotating shaft 110 connected to the movable contactor 116 through a connection member and a main output shaft 102 for outputting a rotating force to actuate the movable contactor 116 through the grounded enclosure side main rotating shaft 110 provided on the operating mechanism 101, are arranged on a coax so as to be coupled with a gear coupling 120, and the operating mechanism 101 is arranged almost under the grounded enclosure 104.