Abstract: A terminal 50a functions as a signal terminal when a first PC 30 and a first port replicator 50 are connected to each other. A terminal 60a functions as a power terminal when a second PC 40 and a second port replicator 60 are connected to each other. Thus, even if the PC or the port replicator becomes multifunctional, it is possible to suppress a significant increase in the number of pins of the connectors 11 and 23. Further, it is possible to keep up with functionally improved PCs and port replicators while maintaining compatibility with the past products.

Abstract: An overvoltage suppression device which suppresses overvoltage that occurs when breakers which turn on/off the connection between a power source bus and a power transmission line, are turned on after the breakers are turned off. The overvoltage suppression device measures the waveform of voltage on the side of the power source and the voltage on the side of the power transmission line, and extracts the waveform of a component in a predetermined frequency band on the basis of the waveform obtained by multiplying the wave shape of the voltage on the side of the power source by the waveform of the voltage on the side of the power transmission line. The breakers are turned on on the basis of a cycle wherein the waveform is peaked.

Abstract: To suppress the magnetizing inrush current occurring when supplying power of three phases of the transformer are performed simultaneously using three single-phase circuit breakers or a non-phase segregated operation-type circuit breaker, without providing a circuit breaker with a resistor or other equipment. A magnetizing inrush current suppression method for transformer suppresses a magnetizing inrush current occurring at the start of energizing of a three-phase transformer 300, when a three-phase power supply 100 is input to a terminal of each phase by means of a three-phase circuit breaker 200.

Abstract: A first calculation part calculates the phase-to-phase steady-state magnetic flux of the three phases of the power supply. A second calculation part calculates the phase-to-phase residual magnetic flux of the three phases in the primary windings side of the transformer when the circuit breakers interrupt the transformer. A phase detection part detects a voltage phase at which polarity and magnitude of the calculated steady-state magnetic flux and residual magnetic flux coincide. Closing control part firstly causes only the circuit breakers of the two phases to close at the detected voltage phase, and then causes the circuit breaker of the remaining one phase to close.

Abstract: A terminal 50a functions as a signal terminal when a first PC 30 and a first port replicator 50 are connected to each other. A terminal 60a functions as a power terminal when a second PC 40 and a second port replicator 60 are connected to each other. Thus, even if the PC or the port replicator becomes multifunctional, it is possible to suppress a significant increase in the number of pins of the connectors 11 and 23. Further, it is possible to keep up with functionally improved PCs and port replicators while maintaining compatibility with the past products.

Abstract: An overvoltage suppression device which suppresses overvoltage that occurs when breakers which turn on/off the connection between a power source bus and a power transmission line, are turned on after the breakers are turned off. The overvoltage suppression device measures the waveform of voltage on the side of the power source and the voltage on the side of the power transmission line, and extracts the waveform of a component in a predetermined frequency band on the basis of the waveform obtained by multiplying the wave shape of the voltage on the side of the power source by the waveform of the voltage on the side of the power transmission line. The breakers are turned on on the basis of a cycle wherein the waveform is peaked.

Abstract: To suppress the magnetizing inrush current occurring when supplying power of three phases of the transformer are performed simultaneously using three single-phase circuit breakers or a non-phase segregated operation-type circuit breaker, without providing a circuit breaker with a resistor or other equipment. A magnetizing inrush current suppression method for transformer suppresses a magnetizing inrush current occurring at the start of energizing of a three-phase transformer 300, when a three-phase power supply 100 is input to a terminal of each phase by means of a three-phase circuit breaker 200.

Abstract: To provide a magnetizing inrush current suppression device for transformer and control method of same, which accurately calculates the residual magnetic flux when a transformer installed in a non-solidly earthed system, is interrupted by circuit breakers, and which enables suppression of the magnetizing inrush current occurring when three single-phase circuit breakers or single-phase circuit breakers are used for simultaneously supplying power to three phases of the transformer, without providing a circuit breaker with a resistor or other equipment to enlarge the circuit breaker.

Abstract: The present invention provides an information processor and a storage device control method, which enable a system to stably operate even in very low temperature environments. This information processor includes a HDD 12 having a storage medium that stores data, a motor for driving the storage medium, and a motor for accessing the data on the storage medium, and accesses the data on the storage medium; a thermister 13 for detecting an ambient temperature around the HDD 12; and a microcomputer 15 for controlling the HDD 12 not to perform the data accessing but to start only the motor for driving the storage medium and the motor for accessing the data on the storage medium when the temperature detected by the thermister 13 is lower than a predetermined temperature.