Abstract: A basic unit portion configured by a standard unit and a variable unit portion whose shape is configured to be changeable. The basic unit portion includes: a first pressure tank with a first opening portion; a circuit breaker; a first bushing; a first disconnecting switch. The variable unit portion includes: a busbar; a second pressure tank with a second opening portion; a second bushing whose necessary number is disposed in accordance with the number of circuits to be externally connected; and second disconnecting switches which are arranged between the busbar and the second bushing. The first opening portion of the basic unit portion and the second opening portion of the variable unit portion are joined facing each other to form into a constitutional body.

Abstract: A battery pack (10) includes a plurality of battery cells (100) which are connected in series to each other, a voltage and current measurement unit (voltage and current measurement unit (200)), a temperature measurement unit (temperature measurement unit (300)), and a calculation unit (calculation unit (420)) provided in an arithmetic operation communication unit (400). The calculation unit (420) calculates a “first electric energy balance” of the battery cells (100) on the basis of voltages and currents, determines internal resistances of the battery cells (100) on the basis of the temperatures, and calculates a “second electric energy balance” of the internal resistances on the basis of currents and the internal resistances.

Abstract: A measurement unit (200) measures voltages and currents of battery cells (100). A battery control unit (400) calculates a present estimation value of a residual capacity of the battery cells (100) by integrating the currents. The voltages of the battery cells (100) are set to a reference voltage value V1 serving as a trigger of a process of correcting the estimation value of the residual capacity and an alarm voltage value Va which is a voltage higher than the reference voltage value. In addition, the battery control unit (400) continues discharge of all the battery cells (100), as it is, when an alarm condition in which a voltage of a minimum capacity cell is equal to or less than the alarm voltage value is not satisfied, and outputs a first signal when the voltage of the minimum capacity cell satisfies the alarm condition.

Abstract: A bus bar connection device for a switchgear has a first bushing with an internal stem conductor whose end is a first connection surface at a nose of the bushing. The bus bar connection device has a second bushing with an internal stem conductor whose end is a second connection surface at a nose of the bushing. The first connection surface of the first bushing is placed opposite the second connection surface of the second bushing, the axis of the first bushing being identical to the axis of the second bushing. A connection element electrically connects the first connection surface with the second connection surface. A cylindrical insulation adapter surrounds the nose of the first bushing, the nose of the second bushing, and the connection element as one.

Abstract: A vacuum circuit breaker includes a tank containing an electrical device. An opening corresponds to a terminal of the electrical device. A porcelain tube protruding from the tank is fixed to an opening base, and has a terminal conductor. A first connection conductor in the porcelain tube is connected to the terminal conductor. A second connection conductor is arranged in the porcelain tube. A third connection conductor is arranged between the first and the second connection conductor, has a closed end concave section fitted onto the first connection conductor and is connected to the second connection conductor by a fastener. A contact is disposed between said first connection conductor and the third connection conductor. The third and second connection conductors are made of a solid conductor. A center of the third connection conductor and a center of the second connection conductor are formed with a threaded section.

Abstract: Switchgear includes a duct by which inside portions of a plurality of cable compartments are linked each other; and a gas flow direction restriction device by which high-pressure gas is flowed only in a predetermined direction in the duct when the high-pressure gas is generated at the inside of any of the cable compartments in the plurality of cable compartments; in which the high-pressure gas can be ejected from a predetermined portion of the switchgear to the outside without increasing outer dimensions of the switchgear in accordance with an internal fault in the cable compartments.

Abstract: A measurement unit (200) measures voltages and currents of battery cells (100). A battery control unit (400) calculates a present estimation value of a residual capacity of the battery cells (100) by integrating the currents. The voltages of the battery cells (100) are set to a reference voltage value V1 serving as a trigger of a process of correcting the estimation value of the residual capacity and an alarm voltage value Va which is a voltage higher than the reference voltage value. In addition, the battery control unit (400) continues discharge of all the battery cells (100), as it is, when an alarm condition in which a voltage of a minimum capacity cell is equal to or less than the alarm voltage value is not satisfied, and outputs a first signal when the voltage of the minimum capacity cell satisfies the alarm condition.

Abstract: A measurement unit (200) measures voltages and currents of battery cells (100). A battery control unit (400) calculates a present estimation value of a residual capacity of the battery cells (100) by integrating the currents. The voltages of the battery cells (100) are set to a reference voltage value V1 serving as a trigger of a process of correcting the estimation value of the residual capacity and an alarm voltage value Va which is a voltage higher than the reference voltage value. In addition, the battery control unit (400) continues discharge of all the battery cells (100), as it is, when an alarm condition in which a voltage of a minimum capacity cell is equal to or less than the alarm voltage value is not satisfied, and outputs a first signal when the voltage of the minimum capacity cell satisfies the alarm condition.

Abstract: For the purpose of obtaining a switchgear that can perform a reliable operation, the switchgear includes: opening and closing coils that drive a movable element, opening and closing capacitors that supply energy to the coils, opening and closing control sections that perform control of charging the capacitors and of energizing the coils, an opening coil that drives the movable element to the open side, an opening capacitor frat supplies energy to the coil, a second opening control section that performs control of charging the opening capacitor and of energizing the opening coil, and an interlock circuit that energizes the second opening control section; and a signal showing that the second opening control section is in operation is supplied to an interlock circuit.

Abstract: A battery pack (10) includes a plurality of battery cells (100), a measurement unit (measurement unit (200)), and a battery control unit (battery control unit (400)). The plurality of battery cells 100 are connected in series to each other. The measurement unit (200) measures voltages of the battery cells (100). The battery control unit (400) controls discharge of the battery cells (100) on the basis of the voltages measured by the measurement unit (200). In addition, when the battery cells (100) perform the discharge, the battery control unit (400) specifies a minimum voltage cell in which the voltage is lowest on the basis of the voltages measured by the measurement unit (200). Further, before the minimum voltage cell is over-discharged, the battery control unit (400) outputs a first signal for reducing a discharge current in the discharge.

Abstract: Switchgear includes a duct by which inside portions of a plurality of cable compartments are linked each other; and a gas flow direction restriction device by which high-pressure gas is flowed only in a predetermined direction in the duct when the high-pressure gas is generated at the inside of any of the cable compartments in the plurality of cable compartments; in which the high-pressure gas can be ejected from a predetermined portion of the switchgear to the outside without increasing outer dimensions of the switchgear in accordance with an internal fault in the cable compartments.

Abstract: A battery control unit (400) controls charge and discharge of battery cells (100) on the basis of temperatures measured by a temperature measurement unit (320) and voltages measured by the voltage and current measurement unit (340). In addition, the battery control unit (400) specifies a lowest temperature cell having the lowest temperature and a highest temperature cell having the highest temperature on the basis of the temperatures measured by the temperature measurement unit (320), when a current is greater than 0. In addition, the battery control unit (400) performs balance control for equalizing voltages of all the battery cells (100), on the basis of the voltages measured by the voltage and current measurement unit (340), when a first temperature condition in which a temperature difference ?T between the highest temperature cell and the lowest temperature cell is equal to or greater than a reference value T1 is not satisfied.

Abstract: A circuit breaker is accommodated in a circuit breaker compartment such that a contacting/separating direction of a contact of the circuit breaker is along a vertical direction, a cable terminal of a first cable connected to one terminal of the circuit breaker via a first disconnector is accommodated in a first connection compartment such that a central conductor of the cable terminal is along the vertical direction, and a disconnector compartment which accommodates the first disconnector such that a contacting/separating direction of a contact of the first disconnector is along the vertical direction, is joined so as to be disposed between the circuit breaker compartment and the first connection compartment.

Abstract: A tank-type vacuum circuit breaker includes: a pressure tank; an insulating frame that is detachably supported by a support member provided in the pressure tank using a coupling; a vacuum interrupter that is supported by the insulating frame and includes a stationary electrode and a moving electrode; a stationary-electrode side terminal that is connectably/disconnectably connected to a bushing-terminal side internal conductor; a moving-electrode side terminal that is connectably/disconnectably connected to a bushing-terminal side internal conductor; and an insulating rod, the inside end of which is detachably coupled to the moving electrode and the outside end of which is coupled to an opening/closing actuation mechanism that opens/closes the contacts of the stationary contact and moving contact.

Abstract: A bus bar connection device for a switchgear has a first bushing with an internal stem conductor whose end is a first connection surface at a nose of the bushing. The bus bar connection device has a second bushing with an internal stem conductor whose end is a second connection surface at a nose of the bushing. The first connection surface of the first bushing is placed opposite the second connection surface of the second bushing, the axis of the first bushing being identical to the axis of the second bushing. A connection element electrically connects the first connection surface with the second connection surface. A cylindrical insulation adapter surrounds the nose of the first bushing, the nose of the second bushing, and the connection element as one.

Abstract: A gas-insulated electric device, by which a cross-sectional area of a central conductor can be reduced. The gas-insulated electric device includes an insulation tube that ranges to portions facing to ground potential portions for a central conductor and to upper-lower portions along the grounding potential portions, and is coaxially arranged along the central conductor in a state where a gap intervenes between the central conductor and the insulation tube; a conductive layer that is formed on an inner surface of an insulation tube and is electrically connected to the central conductor; and a ground layer that is formed on an inner surface or an outer surface of the insulation tube and is grounded; in which heat generated from the central conductor is radiated by convecting the insulation gas through the gap between the central conductor and insulation tube.

Abstract: A gas insulated switchgear includes: gas tanks filled with insulating gas; a circuit breaker which is arranged such that the shaft center direction of a driving shaft thereof is parallel to a front portion of the gas tank and horizontal; a first disconnecting switch which is arranged on the lower side of the circuit breaker and is electrically connected to the circuit breaker; a busbar whose one end is connected to the circuit breaker and the other end is extended in the shaft center direction of the driving shaft of the circuit breaker; a second disconnecting switch electrically connected to the busbar; a cable terminal led out outside the gas tank from the first disconnecting switch; and a cable terminal led out outside the gas tank from the second disconnecting switch.

Abstract: An object of the present invention is to obtain a resin molded bushing which can easily perform positioning of an electric field relaxation shield in a switchgear. The resin molded bushing includes: an electric field relaxation shield which concentrically surrounds the outer periphery of an internal conductor made of conductor; a cast resin which covers the internal conductor and the electric field relaxation shield; and an elastic member which is disposed on the outer periphery of the electric field relaxation shield and is embedded in the cast resin. The height of the elastic member is equal to the thickness of the cast resin which covers the electric field relaxation shield.

Abstract: Provided are: a vacuum interrupter having a fixed contact and a movable contact; a fixed side mounting plate which supports a fixed side conductor; and an operating mechanism which is coupled to a movable side conductor and performs opening and closing operation of both the contacts. The fixed side mounting plate is configured such that a plurality of plate-like members are overlapped; an exposed portion of the fixed side conductor is attached with a divided terminal which has a fitting hole to be fitted to the exposed portion and is formed with a slit in a radial direction from the fitting hole; and the divided terminal is fixed to the fixed side mounting plate and the fixed side conductor is supported by the fixed side mounting plate via the divided terminal.