Abstract: A gas circuit breaker includes a sealed container in which the arc-extinguishing gas is enclosed, a first fixed contactor portion and a second fixed contactor portion fixed to the sealed container, and a movable contactor portion which moves between the first fixed contactor portion and the second fixed contactor portion, to conduct and break current between them, in which an arc generated at a time of current breaking action is extinguished by spraying the arc-extinguishing gas, the gas circuit breaker includes a gas chamber configured to accumulate the unnecessary gas, the sealed container is formed by joining ends of the two hollow truncated cone portions, each having a large opening diameter, with the cylindrical portion therebetween, and the gas chamber is formed inside the cylindrical portion forming the sealed container.

Abstract: A gas circuit breaker includes a first arc contactor electrically connected to a first lead-out conductor, a cylindrical guide portion provided on a second lead-out conductor side, a trigger electrode arranged to be movable between the first arc contactor and the guide portion, and igniting an arc along with a movement in a first half of a current breaking action, a compression chamber being formed by a cylinder having an outer wall and an inner wall both formed in a cylindrical shape, and a piston sliding between the outer wall and the inner wall, and an insulation nozzle guiding the arc-extinguishing gas to an arc ignited at the first arc contactor. The insulation nozzle is formed integrally with the inner wall of the cylinder.

Abstract: A gas circuit breaker includes a trigger electrode which is arranged to be movable between a first arc contactor and a second arc contactor, a compression chamber for pressurizing arc-extinguishing gas, the compression chamber being formed by a cylinder which has an outer wall and an inner wall, each being formed in a cylindrical shape, and which is provided to the second arc contactor, and a piston that slides between the outer wall and the inner wall in conjunction with the trigger electrode, and an insulation nozzle that guides the arc-extinguishing gas pressurized in the compression chamber to an arc ignited between the first arc contactor and the second arc contactor. The insulation nozzle is supported by the inner wall of the cylinder.

Abstract: There is a gas circuit breaker that can reduce deterioration in insulation performance and current breaking performance due to unnecessary gas generated from arc-extinguishing gas sprayed to an arc.

Abstract: There is provided a gas circuit breaker that can appropriately ensure a pressure and a density of arc-extinguishing gas to be sprayed to an arc, and can more surely maintain electric insulation performance.

Abstract: A gas circuit breaker comprises: a first arc contactor 21; a cylindrical second arc contactor 41; a rod-shaped trigger electrode 31 that is disposed to be movable between the first arc contactor 21 and the second arc contactor 41, and moves inside the cylindrical second arc contactor 41 to ignite an arc at the second arc contactor 41 in the latter half of the current break interval; and a guide portion 41b that has an inner diameter larger than the outer diameter of the trigger electrode 31, has an inner diameter smaller than the inner diameter of a portion of the second arc contactor 41 which is close to the trigger electrode 31, and is disposed in the cylinder of the second arc contactor 41 so as to go around the trigger electrode 31 when the trigger electrode 31 is in a closed state with the first arc contactor 21.

Abstract: A gas circuit breaker of an embodiment includes a sealed container, a first contact part and a second contact part, an operation mechanism, an insulating nozzle, a pressure accumulator, and an electric field shield. The insulating nozzle is displaced in conjunction with the first contact part in a separation process of the first contact part and the second contact part. The insulating nozzle surrounds arc discharge generated between the first contact part and the second contact part. The electric field shield is attached to the insulating nozzle. The electric field shield has a floating potential during a period of at least part of the separation process. The electric field shield is electrically connected to the second contact part such that the electric field shield has the same potential in a completely open electrode state in which separation between the first contact part and the second contact part is terminated.

Abstract: A gas circuit breaker to reduce deterioration of insulation and current-breaking performance thereof includes a sealed container (8) filled with arc-extinguishing gas. A first fixed contactor portion (2) and a second fixed contactor portion (4) are fixed to the sealed container (8). A movable contactor portion (3) moves between the first fixed contactor portion (2) and the second fixed contactor portion (4) and conducts and breaks current between the first fixed contactor portion (2) and the second fixed contactor portion (4). An arc is generated between a fixed arc contactor (21) provided to the first fixed contactor portion (2) and a movable arc contactor (31) provided to the movable contactor portion (3) when current breaking action is extinguished by an arc-extinguishing gas being sprayed thereto. Unnecessary gas generated from the arc-extinguishing gas sprayed to the arc is accumulated in a gas chamber (5).

Abstract: There is provided a gas circuit breaker that can reduce deformation of an insulation nozzle and leakage of arc-extinguishing gas compressed to be sprayed to an arc, and can more surely maintain electric insulation performance.

Abstract: There is provided a gas circuit breaker that can suppress the mechanical vibration during movement of the moving electrode, reduce the generation of a triple junction during operation of the gas circuit breaker and the generation of the metal foreign materials, and maintain the electrical insulation performance more reliably.

Abstract: A gas circuit breaker that can reduce deterioration of insulation performance thereof and current breaking performance thereof by the unnecessary gas generated from the arc-extinguishing gas sprayed to the arc is provided.

Abstract: A gas circuit breaker of an embodiment includes a sealed container, a first contact part and a second contact part, an operation mechanism, an insulating nozzle, a pressure accumulator, and an electric field shield. The insulating nozzle is displaced in conjunction with the first contact part in a separation process of the first contact part and the second contact part. The insulating nozzle surrounds arc discharge generated between the first contact part and the second contact part. The electric field shield is attached to the insulating nozzle. The electric field shield has a floating potential during a period of at least part of the separation process. The electric field shield is electrically connected to the second contact part such that the electric field shield has the same potential in a completely open electrode state in which separation between the first contact part and the second contact part is terminated.

Abstract: An angle detection device includes: first and second rotation measuring instruments; an anomaly detection unit detecting occurrences of anomalies in the first and second rotation measuring instruments; and a switching interpolation unit configured to select a first angle signal and a first angular speed signal and output as a third angle signal and a third angular speed signal when the first rotation measuring instrument is normal, and to perform switching so that a second angle signal and a second angular speed signal are output as the third angle signal and the third angular speed signal while performing interpolation so that the difference between the first angle signal and the second angle signal is reduced stepwise if the second rotation measuring instrument is normal when an anomaly has occurred in the first rotation measuring instrument.

Abstract: A signal processor includes a period detection section which detects that a period is currently used for communication of a frame; a pattern detection section which detects, from the received signal, a first signal pattern by which the end of communication of the frame is recognized; and an output processing section which outputs the received signal to a controller; configured to instruct, upon detection of the first signal pattern in the period being currently used for communication of a frame, the controller to halt startup of communication action of the next frame, until the period being currently used for communication of a frame comes to the end, to thereby reduce an event such that frames are transmitted from a plurality of communication devices simultaneously, and to thereby allow the communication action for the next frame to proceed correctly.

Abstract: According to an embodiment, a gas insulated electrical equipment includes: a high-voltage conductor to be electrically charged; a hermetically sealed tank to be filled with insulating gas, one or more insulating spacers for dividing the hermetically sealed tank into gas compartments and supporting the high-voltage conductor; and a pressure release device equipped with a mouth of flow channel adapted to allow the inside and the outside of the hermetically sealed tank to communicate with each other so as to release the pressure in the hermetically sealed tank, which maintains the hermetically sealed state in an ordinary condition where the pressure in a gas compartment does not exceed the working pressure but releases the pressure in the hermetically sealed tank in an abnormal condition where the pressure in the gas compartment exceeds the working pressure.

Abstract: An angle detection device includes: first and second rotation measuring instruments; an anomaly detection unit detecting occurrences of anomalies in the first and second rotation measuring instruments; and a switching interpolation unit configured to select a first angle signal and a first angular speed signal and output as a third angle signal and a third angular speed signal when the first rotation measuring instrument is normal, and to perform switching so that a second angle signal and a second angular speed signal are output as the third angle signal and the third angular speed signal while performing interpolation so that the difference between the first angle signal and the second angle signal is reduced stepwise if the second rotation measuring instrument is normal when an anomaly has occurred in the first rotation measuring instrument.

Abstract: A gas circuit breaker includes movable and fixed electrode parts arranged to face each other in an engaging/separating manner in a container filled with an insulating gas, an operating mechanism attached to a partition of the container and configured to output an operating force to the movable electrode part, an operating rod attached to the movable electrode part, a first link rotatably attached to the operating rod, a lever rotatably attached to the first link, a support bearing fixed to the partition of the container via an insulating spacer, a second link rotatably attached to the lever and also rotatably attached to the support bearing, a seal bearing connected through the partition of the container, a seal rod rotatably attached to the center of the lever and slidably supported to the seal bearing, and a third link rotatably attached to the seal rod and also attached to the operating mechanism.

Abstract: A node system includes a first node, a second node, and a supervisory node which transmit frames while increasing or decreasing the cycle microtick count, and determines reduced cycle microtick counts by subtracting or adding a rate correction limit value from or to the cycle microtick count of the supervisory node when reception of the first frame transmitted by the first node stop and the cycle microtick count of the supervisory node when reception of the first and second frames stop.

Abstract: A node system includes a first node, a second node, and a supervisory node which transmit frames while increasing or decreasing the cycle microtick count, and determines reduced cycle microtick counts by subtracting or adding a rate correction limit value from or to the cycle microtick count of the supervisory node when reception of the first frame transmitted by the first node stop and the cycle microtick count of the supervisory node when reception of the first and second frames stop.

Abstract: According to an embodiment, a gas insulated electrical equipment includes: a high-voltage conductor to be electrically charged; a hermetically sealed tank to be filled with insulating gas, one or more insulating spacers for dividing the hermetically sealed tank into gas compartments and supporting the high-voltage conductor; and a pressure release device equipped with a mouth of flow channel adapted to allow the inside and the outside of the hermetically sealed tank to communicate with each other so as to release the pressure in the hermetically sealed tank, which maintains the hermetically sealed state in an ordinary condition where the pressure in a gas compartment does not exceed the working pressure but releases the pressure in the hermetically sealed tank in an abnormal condition where the pressure in the gas compartment exceeds the working pressure.