Abstract: A generated power output measuring apparatus includes a load unit connected to a connecting wire between a power generator using natural energy and a power conditioner configured to supply electric power of the power generator to an external load, the load unit being configured to draw a current from the power generator, a measuring unit configured to measure a voltage and current of the power generator via the load unit, and a control unit configured to increase the current flowing through the load unit and cause the measuring unit to make a measurement when the voltage measured by the measuring unit is in a range of operating voltage of the power conditioner.

Abstract: A generated power output measuring apparatus is connected to a connecting wire between a power generator using natural energy and a power conditioner configured to supply electric power of the power generator to an external load. The generated power output measuring apparatus includes a load unit configured to draw a current from the power generator, a measuring unit configured to measure a voltage and current of the power generator via the load unit, and a control unit configured to increase the current flowing through the load unit and causing the measuring unit to make a measurement when the voltage measured by the measuring unit is in a range of operating voltage of the power conditioner.

Abstract: A harmonics survey system includes an induction coil arranged so as to cross over a magnetic flux generated by a current passing a distribution line to be surveyed and adapted to detect a detection current caused by an electro motive force in proportion to the current passing the distribution line, a harmonics detection unit operatively connected to the induction coil and adapted to detect a fundamental component and a harmonic component of the detection current detected by the induction coil, a harmonic current content operation unit for operating the harmonic current content of the harmonic component with respect to the fundamental component detected by the harmonic detection unit, and an indication unit for indicating the harmonic current content operated by the harmonic current operation unit.

Abstract: A gas circuit breaker includes a case body in which an insulating gas is enclosed, a stationary contact part accommodated in the case body and equipped with tulip type stationary contact members, and a movable contact part having a movable contact member. The movable contact member is rotated about a main shaft serving as a fulcrum and makes and breaks a contact with the stationary contacts member, so that a large capacity electrical line can be closed and opened at a high speed.

Abstract: There is provided an acr extinguishing device of a circuit breaker which closes and opens an electric line, one of two contact parts being fixed to a base part. The arc extinguishing device includes an arc runner formed of an electrically conductive member and arranged on an outer circumference of the above one of the two contact parts. The arc extinguishing device moves, to the arc runner, an arc occurring when a contact made by the two contact parts is opened whereby the arc is extinguished. The arc runner has a cylindrical shape and includes a rising portion formed on an entire inner circumference of the cylindrical shape. A slant angle of the rising portion obtained on a depth side thereof is greater than another slant angle thereof obtained on a front side thereof.

Abstract: A device for detecting and isolating a downed conductor in a three-phase four-wire multi-grounded distribution system cooperates with a power supply protective device if the device has a breaking capacity less than the maximum prospective short-circuit current of the distribution line, and the device is installed at a lateral of the distribution line. The device comprises a current detecting device, a high-pass filter, a band-pass filter, two arcing ground fault current-detecting circuits, a first overcurrent-detecting circuit that delivers an output when the output current form the current detecting device exceeds a predetermined value, a second overcurrent-detecting circuit that detects an overcurrent exceeding the breaking capacity of the device which has a breaking capacity less than the maximum prospective short-circuit current of the distribution line, a no-voltage detecting circuit for sensing that the distribution line is not electrically charged, and a trip mechanism.

Abstract: A device for detecting and isolating a downed conductor in a three-phase four-wire multi-grounded distribution system. The device cooperates with a power supply protective device if the device has a breaking capacity less than the maximum prospective short-circuit current of the distribution line, and the device is installed at a tap point of the distribution line. The device comprises a current detector, a low-pass filter, a high-pass filter, an arcing ground fault current-detecting circuit, a first overcurrent-detecting circuit that delivers an output when the output current from the low-pass filter exceeds a given value, a second overcurrent-detecting circuit that detects an overcurrent exceeding the breaking capacity of a device which has a breaking capacity less than the maximum prospective short-circuit current of the distribution line, a no-voltage detecting circuit for sensing that the distribution line is not electrically charged, a main contact and a trip mechanism.

Abstract: An enclosed switchboard has a contact frame fitted with contacts which can move relative to a unit frame having a circuit breaker, an electromagnetic switch, and an auxiliary relay, etc. mounted thereon. The contacts can be operated to disconnected, test, and connected positions with the unit frame disposed in the panel frame by an operating lever inserted into a window on a closed door covering the front side of the panel frame. A shutter mechanism is provided between the window and the insertion position of the operating lever in order to cover the insertion position of the operating lever for preventing insertion of the operating lever when the operating handle is set to an ON position, and an interlocking mechanism is also provided between the shutter mechanism and the operating handle of a circuit breaker disposed at the unit frame.