Abstract: When a ground fault detection device detects a ground fault of a photovoltaic string, for example, while a power conditioner is in operation, a great current may be flowing in a switching section from the photovoltaic string, so that components resistant to a great current have been used for the switching section. A ground fault detection device includes a stop determination unit configured to determine whether a power converter for converting electric power from a solar battery is in stoppage, and a ground fault detector configured to detect a ground fault of the solar battery in a state where the solar battery and the power converter are electrically disconnected from each other by a disconnection unit arranged between the solar battery and the power converter when the stop determination unit determines that the power converter is in stoppage.

Abstract: A detection device for detecting a state of electric power has a first current transformer that measures a first current on a first power line side of a connecting point between a first power line derived from a commercial power supply and a second power line derived from a power generation device which supplies electric power equal in frequency to the commercial power supply, a second current transformer that measures a second current on a second power line side of the connecting point, a first calculation unit that calculates a decision value based on a product of a measured value of the first current and a measured value of the second current, and a detection unit that detects a power flow direction of electric power of the first power line based on the decision value.

Abstract: The present invention relates to a detecting device and method, and a program which can detect a power state easily at low cost. A current transformer measures current of a commercial power system from a commercial power supply through a connection point of the commercial power system and a power generation system from a solar power generation system that supplies power having the same frequency as the commercial power supply. A current transformer measures power at the power generation system side through the connection point. A decision value calculator calculates a decision value based on a value obtained through multiplication of a measured value of current through the current transformer and through the current transformer. A flow detector detects a power flow of the commercial power system based on the calculated value. The present invention can be applied to a power measuring system for use in homes, for example.

Abstract: A hot-air supplying method that includes: generating, by means of a heat pump, hot air that is at a temperature lower than a desired target hot-air temperature; subsequently heating, by a heater, the hot air having been generated by the heat pump, while controlling the heater the temperature adjuster so as to adjust the temperature of hot air thus heated to the target hot-air temperature. This makes it possible to supply, with reduced energy loss and at low costs, hot air for processing a work, the hot air being necessary in a factory where processing and assembly or the like are carried out. Further, temperature control accuracy is enhanced.

Abstract: Sensors are provided with information transmission units for transmitting power information to a mobile information terminal and a server. The server is provided with a server storage unit that stores power information for the duration of a second period. The mobile information terminal is provided with: a terminal storage unit that stores power information for the duration of a first period that is shorter than the second period; a power information acquisition unit that acquires power information from the terminal storage unit or the server, in accordance with a display period specified by a user; and a display control unit that displays the acquired power information.

Abstract: A detection device for detecting a state of electric power has a first current transformer that measures a first current on a first power line side of a connecting point between a first power line derived from a commercial power supply and a second power line derived from a power generation device which supplies electric power equal in frequency to the commercial power supply, a second current transformer that measures a second current on a second power line side of the connecting point, a first calculation unit that calculates a decision value based on a product of a measured value of the first current and a measured value of the second current, and a detection unit that detects a power flow direction of electric power of the first power line based on the decision value.

Abstract: The present invention relates to a voltage converter, a voltage converting method, a power adjuster, a power adjusting method, a photovoltaic system, and a management device which are capable of generating power with a higher output. In a photovoltaic system 11, each of the output converters 21-1 to 21-8, which converts a voltage of power generated by each of solar battery modules 22-1 to 22-8 to a voltage to be outputted to the outside, is provided with respect to each of the solar battery modules 22-1 to 22-8. In each of the output converters 21-1 to 21-8, an operation of a DC/DC converting part that executes a process for converting the voltage is switched to either conversion-rate fixing or maximum power point tracking control based on an amount of output power of the DC/DC converting part. The present invention is, for example, applicable to a photovoltaic system provided with an output converter with respect to each of solar battery modules.

Abstract: In order to detect an operating state of equipment, when a plate material reaches a support part, a press machine outputs a start signal to move a press part downward. An input receiver receives input of the start signal. An operating detector detects that the press machine is in an operating state. When the press machine moves the press part upward, and shaping of the plate material ends, the press machine outputs a standby signal. The input receiver receives input of the standby signal. The detector detects that the press machine is in a standby state. When the plate material is again conveyed onto a roller conveyer from the support part, the press machine outputs a stop signal. The input receiver receives input of the stop signal. The detector detects that the press machine is in a stop state.

Abstract: A hot-air supplying method that includes: generating, by means of a heat pump, hot air that is at a temperature lower than a desired target hot-air temperature; subsequently heating, by a heater, the hot air having been generated by the heat pump, while controlling the heater the temperature adjuster so as to adjust the temperature of hot air thus heated to the target hot-air temperature. This makes it possible to supply, with reduced energy loss and at low costs, hot air for processing a work, the hot air being necessary in a factory where processing and assembly or the like are carried out. Further, temperature control accuracy is enhanced.

Abstract: Optical fiber guides are provided outside a waveguide mounting region of a supporting substrate. Optical fibers are provided so as to be fitted in the optical fibers, respectively. In addition, end faces of the optical fibers and end faces to which a core of an optical waveguide is exposed are opposed and almost parallel to each other. Furthermore, the end face to which the core of the optical waveguide is exposed is provided so as to form an acute angle with a surface of the supporting substrate. Thus, tip ends of the optical fibers are not likely to be shifted from the core in a thickness direction of an optical waveguide device.

Abstract: Optical fiber guides are provided outside a waveguide mounting region of a supporting substrate. Optical fibers are provided so as to be fitted in the optical fibers, respectively. In addition, end faces of the optical fibers and end faces to which a core of an optical waveguide is exposed are opposed and almost parallel to each other. Furthermore, the end face to which the core of the optical waveguide is exposed is provided so as to form an acute angle with a surface of the supporting substrate. Thus, tip ends of the optical fibers are not likely to be shifted from the core in a thickness direction of an optical waveguide device.

Abstract: A telephone apparatus of the present invention comprises a telephone number comparator for comparing a telephone number included in caller information delivered from caller identification delivery service with a telephone number registered in an electronic telephone directory, and displays the telephone number registered in the electronic telephone directory in display unit when the telephone numbers match at least in part as a result of the comparison. The telephone apparatus is thus able to display a correct telephone number of the incoming call and dial the telephone number correctly when making a callback.

Abstract: A telephone apparatus of the present invention comprises a telephone number comparator for comparing a telephone number included in caller information delivered from caller identification delivery service with a telephone number registered in an electronic telephone directory, and displays the telephone number registered in the electronic telephone directory in display unit when the telephone numbers match at least in part as a result of the comparison. The telephone apparatus is thus able to display a correct telephone number of the incoming call and dial the telephone number correctly when making a callback.

Abstract: A relay of the present invention comprises a coil plate 30 having at least one layer of spiral flat coil 36a-36d formed around each of a pair of holes 32, 33 and fixed contacts 23a, 24a and movable contacts which are opposed to each other contactably and separably via the holes 32, 33 in the coil plate 30. The fixed contacts 23a, 24a are provided on one side of each of a pair of flat core blocks 21, 22 juxtaposed and insulated from one another. The movable contacts are provided on one movable contactor 43 which is supported so as to be drivable along a direction of plate thickness via at least one hinge portion 42 extending from a support member 44 for a movable contact plate 40.

Abstract: A micro relay comprising a coil plate 40 having a spiral flat coil 48 formed around a through hole 42 on the front and rear surfaces of the plate, a fixed contact plate 50 which is tightly fixed on the upper surface of this coil plate 40 and uses a tip portion of an iron core 51 projecting from the through hole 42 as a fixed contact 52 and a movable contact plate 20 which makes a movable contact piece 23 pivotally supported in the direction of plate thickness via a hinge portion 22 extending from inside an annular yoke 24 face the fixed contact 52 so as to allow it to come in and out of contact with the fixed contact 52. With this arrangement, a relay of a high productivity having no scattering in operation characteristics can be obtained.

Abstract: Wiring patterns 50, 60 are formed in zigzag fashion on respective ones of both sides of a flexible insulating sheet 70. The wiring patterns 50, 60 include linear portions 50C, 60C and arcuate portions 50A, 60A, respectively. The linear portions 50C and the linear portions 60C overlap. The arcuate portion 60A is situated between two arcuate portions 50A that neighbor each other. One end of each of the wiring patterns 50, 60 is connected to a detection circuit 75 which detects a change in inductance. The other ends of the wiring patterns 50, 60 are connected together through a through-hole 70A. The sheet 70 is disposed in such a manner that the linear portions 50C, 60C will perpendicularly intersect the direction of stress, which is to be measured, acting upon a member 80 undergoing measurement. The sheet 70 and the wiring patterns 50, 60 construct a detection coil 71. An AC excitation current flows through the detection coil 71.